Appendix A: Hydrologic Assessment Results
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Appendix A: Hydrologic Assessment Results
Feasibility Analysis to Restore A-1 Existing Data Report River Herring to the Fore River June 2008
APPENDIX A: Hydrologic Assessment Results
Table A-1: Annual and Monthly Flow Statistics for Monatiquot River and East Branch Neponset River Gages
Min Max Mean Median Min Max Mean MedianMonatiquot 3/31/06 - 5/6/08 18 79 44 48 0.63 2.75 1.53 1.67
3/31/06 - 5/6/08 32 129 61 56 1.10 4.49 2.12 1.9710/1/52 - 5/6/08 8 676 72 58 0.26 23.57 2.52 2.02
Monatiquot 3/31/06 - 5/6/08 7 326 79 70 0.24 11.36 2.75 2.443/31/06 - 5/6/08 19 461 92 78 0.66 16.07 3.21 2.7210/1/52 - 5/6/08 9 461 76 64 0.32 16.07 2.66 2.24
Monatiquot 3/31/06 - 5/6/08 15 308 106 93 0.52 10.73 3.68 3.243/31/06 - 5/6/08 26 351 116 108 0.92 12.24 4.04 3.7510/1/52 - 5/6/08 18 862 99 82 0.63 30.04 3.46 2.87
Monatiquot 3/31/06 - 5/6/08 11 384 70 42 0.38 13.38 2.45 1.463/31/06 - 5/6/08 18 460 84 57 0.63 16.03 2.93 1.9910/1/52 - 5/6/08 16 544 95 79 0.55 18.97 3.30 2.76
Monatiquot 3/31/06 - 5/6/08 12 448 89 59 0.42 15.61 3.10 2.043/31/06 - 5/6/08 17 395 89 64 0.59 13.75 3.11 2.2210/1/52 - 5/6/08 9 395 59 47 0.31 13.75 2.05 1.65
Monatiquot 3/31/06 - 5/6/08 5 537 105 47 0.18 18.71 3.67 1.643/31/06 - 5/6/08 18 651 112 53 0.63 22.68 3.91 1.8410/1/52 - 5/6/08 3 934 43 25 0.10 32.54 1.50 0.88
Monatiquot 3/31/06 - 5/6/08 1 156 32 13 0.04 5.44 1.11 0.453/31/06 - 5/6/08 9 148 35 28 0.32 5.15 1.21 0.9710/1/52 - 5/6/08 1 388 21 14 0.02 13.53 0.73 0.48
Monatiquot 3/31/06 - 5/6/08 1 31 8 4 0.02 1.08 0.26 0.133/31/06 - 5/6/08 5 64 18 18 0.19 2.24 0.63 0.6310/1/52 - 5/6/08 1 1435 22 12 0.02 50.00 0.78 0.40
Monatiquot 3/31/06 - 5/6/08 0 19 6 3 0.02 0.66 0.19 0.123/31/06 - 5/6/08 5 66 14 13 0.17 2.32 0.50 0.4410/1/52 - 5/6/08 1 383 23 13 0.02 13.35 0.79 0.44
Monatiquot 3/31/06 - 5/6/08 0 116 9 2 0.02 4.04 0.32 0.083/31/06 - 5/6/08 6 206 22 13 0.21 7.17 0.78 0.4410/1/52 - 5/6/08 2 814 34 18 0.06 28.35 1.17 0.63
Monatiquot 3/31/06 - 5/6/08 1 236 41 15 0.03 8.22 1.44 0.513/31/06 - 5/6/08 9 315 55 33 0.30 10.99 1.92 1.1610/1/52 - 5/6/08 4 513 50 38 0.13 17.87 1.74 1.32
Monatiquot 3/31/06 - 5/6/08 3 82 34 33 0.09 2.86 1.18 1.153/31/06 - 5/6/08 9 126 46 44 0.30 4.38 1.62 1.5310/1/52 - 5/6/08 6 653 68 54 0.21 22.76 2.37 1.88
Monatiquot 3/31/06 - 5/6/08 0 537 53 28 0.02 18.71 1.84 0.963/31/06 - 5/6/08 5 651 63 40 0.17 22.68 2.20 1.4010/1/52 - 5/6/08 1 1435 55 39 0.02 50.00 1.92 1.36
Month Flow (cfs) Flow per Drainage Area (cfs/mi2)Period of RecordRiver
E. Br. Neponset
E. Br. Neponset
E. Br. Neponset
E. Br. NeponsetANNUAL
E. Br. Neponset
E. Br. Neponset
E. Br. Neponset
E. Br. Neponset
E. Br. Neponset
E. Br. Neponset
E. Br. Neponset
E. Br. Neponset
E. Br. NeponsetSEP
OCT
NOV
DEC
MAY
JUN
JUL
AUG
JAN
FEB
MAR
APR
RegressionR2 Value
0.71
0.75
0.65
0.89
0.88
0.83
0.89
0.90
0.85
0.81
0.25
0.62
0.80
Note: Flow data for the East Branch Neponset River gage (drainage area = 27.2 mi2) have been multiplied by a factor of 1.06 to reflect the drainage area at the Monatiquot River gage (28.7 mi2).
Feasibility Analysis to Restore A-2 Existing Data Report River Herring to the Fore River June 2008
Table A-2: Annual and Monthly Flow Statistics for Great Pond Dam Outlet
Min Max Mean Median Min Max Mean MedianMonatiquot 3/31/06 - 5/6/08 3.8 16.8 9.3 10.2 0.63 2.75 1.53 1.67
E. Br. Neponset 10/1/52 - 5/6/08 1.6 143.8 15.4 12.3 0.26 23.57 2.52 2.02Monatiquot 3/31/06 - 5/6/08 1.5 69.3 16.8 14.9 0.24 11.36 2.75 2.44
E. Br. Neponset 10/1/52 - 5/6/08 2.0 98.0 16.2 13.7 0.32 16.07 2.66 2.24Monatiquot 3/31/06 - 5/6/08 3.2 65.5 22.5 19.8 0.52 10.73 3.68 3.24
E. Br. Neponset 10/1/52 - 5/6/08 3.8 183.2 21.1 17.5 0.63 30.04 3.46 2.87Monatiquot 3/31/06 - 5/6/08 2.3 81.6 15.0 8.9 0.38 13.38 2.45 1.46
E. Br. Neponset 10/1/52 - 5/6/08 3.4 115.7 20.1 16.8 0.55 18.97 3.30 2.76Monatiquot 3/31/06 - 5/6/08 2.6 95.2 18.9 12.4 0.42 15.61 3.10 2.04
E. Br. Neponset 10/1/52 - 5/6/08 1.9 83.9 12.5 10.1 0.31 13.75 2.05 1.65Monatiquot 3/31/06 - 5/6/08 1.1 114.1 22.4 10.0 0.18 18.71 3.67 1.64
E. Br. Neponset 10/1/52 - 5/6/08 0.6 198.5 9.1 5.4 0.10 32.54 1.50 0.88Monatiquot 3/31/06 - 5/6/08 0.2 33.2 6.8 2.8 0.04 5.44 1.11 0.45
E. Br. Neponset 10/1/52 - 5/6/08 0.1 82.5 4.5 2.9 0.02 13.53 0.73 0.48Monatiquot 3/31/06 - 5/6/08 0.1 6.6 1.6 0.8 0.02 1.08 0.26 0.13
E. Br. Neponset 10/1/52 - 5/6/08 0.1 305.0 4.8 2.5 0.02 50.00 0.78 0.40Monatiquot 3/31/06 - 5/6/08 0.1 4.0 1.2 0.7 0.02 0.66 0.19 0.12
E. Br. Neponset 10/1/52 - 5/6/08 0.1 81.4 4.8 2.7 0.02 13.35 0.79 0.44Monatiquot 3/31/06 - 5/6/08 0.1 24.7 2.0 0.5 0.02 4.04 0.32 0.08
E. Br. Neponset 10/1/52 - 5/6/08 0.4 172.9 7.1 3.8 0.06 28.35 1.17 0.63Monatiquot 3/31/06 - 5/6/08 0.2 50.2 8.8 3.1 0.03 8.22 1.44 0.51
E. Br. Neponset 10/1/52 - 5/6/08 0.8 109.0 10.6 8.1 0.13 17.87 1.74 1.32Monatiquot 3/31/06 - 5/6/08 0.5 17.4 7.2 7.0 0.09 2.86 1.18 1.15
E. Br. Neponset 10/1/52 - 5/6/08 1.3 138.8 14.4 11.4 0.21 22.76 2.37 1.88Monatiquot 3/31/06 - 5/6/08 0.1 114.1 11.2 5.8 0.02 18.71 1.84 0.96
E. Br. Neponset 10/1/52 - 5/6/08 0.1 305.0 11.7 8.3 0.02 50.00 1.92 1.36
Month Flow (cfs) Flow per Drainage Area (cfs/mi2)Period of RecordGage
ANNUAL
SEP
OCT
NOV
DEC
MAY
JUN
JUL
AUG
JAN
FEB
MAR
APR
Note: A range of flow statistics for Great Pond Dam Outlet (drainage area = 6.1 mi2) have been estimated by adjusting to the Monatiquot River gage (drainage area = 28.7 mi2) and the East Branch Neponset River gage (drainage area = 27.2 mi2).
Feasibility Analysis to Restore A-3 Existing Data Report River Herring to the Fore River June 2008
Table A-3: Annual and Monthly Flow Statistics for Sunset Lake Dam Outlet
Min Max Mean Median Min Max Mean MedianMonatiquot 3/31/06 - 5/6/08 0.31 1.38 0.76 0.84 0.63 2.75 1.53 1.67
E. Br. Neponset 10/1/52 - 5/6/08 0.13 11.78 1.26 1.01 0.26 23.57 2.52 2.02Monatiquot 3/31/06 - 5/6/08 0.12 5.68 1.37 1.22 0.24 11.36 2.75 2.44
E. Br. Neponset 10/1/52 - 5/6/08 0.16 8.03 1.33 1.12 0.32 16.07 2.66 2.24Monatiquot 3/31/06 - 5/6/08 0.26 5.37 1.84 1.62 0.52 10.73 3.68 3.24
E. Br. Neponset 10/1/52 - 5/6/08 0.31 15.02 1.73 1.43 0.63 30.04 3.46 2.87Monatiquot 3/31/06 - 5/6/08 0.19 6.69 1.23 0.73 0.38 13.38 2.45 1.46
E. Br. Neponset 10/1/52 - 5/6/08 0.28 9.49 1.65 1.38 0.55 18.97 3.30 2.76Monatiquot 3/31/06 - 5/6/08 0.21 7.80 1.55 1.02 0.42 15.61 3.10 2.04
E. Br. Neponset 10/1/52 - 5/6/08 0.15 6.88 1.03 0.83 0.31 13.75 2.05 1.65Monatiquot 3/31/06 - 5/6/08 0.09 9.36 1.83 0.82 0.18 18.71 3.67 1.64
E. Br. Neponset 10/1/52 - 5/6/08 0.05 16.27 0.75 0.44 0.10 32.54 1.50 0.88Monatiquot 3/31/06 - 5/6/08 0.02 2.72 0.56 0.23 0.04 5.44 1.11 0.45
E. Br. Neponset 10/1/52 - 5/6/08 0.01 6.76 0.37 0.24 0.02 13.53 0.73 0.48Monatiquot 3/31/06 - 5/6/08 0.01 0.54 0.13 0.06 0.02 1.08 0.26 0.13
E. Br. Neponset 10/1/52 - 5/6/08 0.01 25.00 0.39 0.20 0.02 50.00 0.78 0.40Monatiquot 3/31/06 - 5/6/08 0.01 0.33 0.10 0.06 0.02 0.66 0.19 0.12
E. Br. Neponset 10/1/52 - 5/6/08 0.01 6.67 0.40 0.22 0.02 13.35 0.79 0.44Monatiquot 3/31/06 - 5/6/08 0.01 2.02 0.16 0.04 0.02 4.04 0.32 0.08
E. Br. Neponset 10/1/52 - 5/6/08 0.03 14.17 0.59 0.31 0.06 28.35 1.17 0.63Monatiquot 3/31/06 - 5/6/08 0.01 4.11 0.72 0.25 0.03 8.22 1.44 0.51
E. Br. Neponset 10/1/52 - 5/6/08 0.07 8.93 0.87 0.66 0.13 17.87 1.74 1.32Monatiquot 3/31/06 - 5/6/08 0.04 1.43 0.59 0.57 0.09 2.86 1.18 1.15
E. Br. Neponset 10/1/52 - 5/6/08 0.10 11.38 1.18 0.94 0.21 22.76 2.37 1.88Monatiquot 3/31/06 - 5/6/08 0.01 9.36 0.92 0.48 0.02 18.71 1.84 0.96
E. Br. Neponset 10/1/52 - 5/6/08 0.01 25.00 0.96 0.68 0.02 50.00 1.92 1.36
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
ANNUAL
SEP
OCT
NOV
DEC
Month Flow (cfs) Flow per Drainage Area (cfs/mi2)Period of RecordGage
Note: A range of flow statistics for Sunset Lake Dam Outlet (drainage area = 0.5 mi2) have been estimated by adjusting to the Monatiquot River gage (drainage area = 28.7 mi2) and the East Branch Neponset River gage (drainage area = 27.2 mi2).
Feasibility Analysis to Restore A-4 Existing Data Report River Herring to the Fore River June 2008
Table A-4: Annual and Monthly Flow Statistics for Farm River at Monatiquot River
Min Max Mean Median Min Max Mean MedianMonatiquot 3/31/06 - 5/6/08 8.1 35.5 19.7 21.6 0.63 2.75 1.53 1.67
E. Br. Neponset 10/1/52 - 5/6/08 3.4 304.0 32.6 26.1 0.26 23.57 2.52 2.02Monatiquot 3/31/06 - 5/6/08 3.1 146.5 35.5 31.5 0.24 11.36 2.75 2.44
E. Br. Neponset 10/1/52 - 5/6/08 4.1 207.3 34.3 28.9 0.32 16.07 2.66 2.24Monatiquot 3/31/06 - 5/6/08 6.7 138.4 47.5 41.8 0.52 10.73 3.68 3.24
E. Br. Neponset 10/1/52 - 5/6/08 8.1 387.5 44.6 37.0 0.63 30.04 3.46 2.87Monatiquot 3/31/06 - 5/6/08 4.9 172.6 31.6 18.9 0.38 13.38 2.45 1.46
E. Br. Neponset 10/1/52 - 5/6/08 7.1 244.7 42.5 35.6 0.55 18.97 3.30 2.76Monatiquot 3/31/06 - 5/6/08 5.4 201.4 40.0 26.3 0.42 15.61 3.10 2.04
E. Br. Neponset 10/1/52 - 5/6/08 4.0 177.4 26.5 21.3 0.31 13.75 2.05 1.65Monatiquot 3/31/06 - 5/6/08 2.3 241.4 47.3 21.1 0.18 18.71 3.67 1.64
E. Br. Neponset 10/1/52 - 5/6/08 1.3 419.7 19.3 11.4 0.10 32.54 1.50 0.88Monatiquot 3/31/06 - 5/6/08 0.5 70.1 14.4 5.8 0.04 5.44 1.11 0.45
E. Br. Neponset 10/1/52 - 5/6/08 0.3 174.5 9.4 6.2 0.02 13.53 0.73 0.48Monatiquot 3/31/06 - 5/6/08 0.3 13.9 3.4 1.7 0.02 1.08 0.26 0.13
E. Br. Neponset 10/1/52 - 5/6/08 0.3 645.0 10.1 5.2 0.02 50.00 0.78 0.40Monatiquot 3/31/06 - 5/6/08 0.2 8.5 2.5 1.6 0.02 0.66 0.19 0.12
E. Br. Neponset 10/1/52 - 5/6/08 0.3 172.2 10.2 5.7 0.02 13.35 0.79 0.44Monatiquot 3/31/06 - 5/6/08 0.2 52.1 4.1 1.1 0.02 4.04 0.32 0.08
E. Br. Neponset 10/1/52 - 5/6/08 0.8 365.7 15.1 8.1 0.06 28.35 1.17 0.63Monatiquot 3/31/06 - 5/6/08 0.3 106.1 18.6 6.5 0.03 8.22 1.44 0.51
E. Br. Neponset 10/1/52 - 5/6/08 1.7 230.5 22.5 17.1 0.13 17.87 1.74 1.32Monatiquot 3/31/06 - 5/6/08 1.1 36.9 15.2 14.8 0.09 2.86 1.18 1.15
E. Br. Neponset 10/1/52 - 5/6/08 2.7 293.6 30.5 24.2 0.21 22.76 2.37 1.88Monatiquot 3/31/06 - 5/6/08 0.2 241.4 23.7 12.4 0.02 18.71 1.84 0.96
E. Br. Neponset 10/1/52 - 5/6/08 0.3 645.0 24.8 17.5 0.02 50.00 1.92 1.36
Month Flow (cfs) Flow per Drainage Area (cfs/mi2)Period of RecordGage
ANNUAL
SEP
OCT
NOV
DEC
MAY
JUN
JUL
AUG
JAN
FEB
MAR
APR
Note: A range of flow statistics for Farm River at Monatiquot River (drainage area = 12.9 mi2) have been estimated by adjusting to the Monatiquot River gage (drainage area = 28.7 mi2) and the East Branch Neponset River gage (drainage area = 27.2 mi2).
Feasibility Analysis to Restore A-5 Existing Data Report River Herring to the Fore River June 2008
Table A-5: Annual and Monthly Flow Statistics for Cochato River at Former Diversion
Min Max Mean Median Min Max Mean MedianMonatiquot 3/31/06 - 5/6/08 6.7 29.5 16.4 17.9 0.63 2.75 1.53 1.67
E. Br. Neponset 10/1/52 - 5/6/08 2.8 252.2 27.0 21.6 0.26 23.57 2.52 2.02Monatiquot 3/31/06 - 5/6/08 2.6 121.5 29.4 26.1 0.24 11.36 2.75 2.44
E. Br. Neponset 10/1/52 - 5/6/08 3.4 171.9 28.5 24.0 0.32 16.07 2.66 2.24Monatiquot 3/31/06 - 5/6/08 5.6 114.8 39.4 34.7 0.52 10.73 3.68 3.24
E. Br. Neponset 10/1/52 - 5/6/08 6.7 321.4 37.0 30.7 0.63 30.04 3.46 2.87Monatiquot 3/31/06 - 5/6/08 4.1 143.2 26.2 15.7 0.38 13.38 2.45 1.46
E. Br. Neponset 10/1/52 - 5/6/08 5.9 203.0 35.3 29.5 0.55 18.97 3.30 2.76Monatiquot 3/31/06 - 5/6/08 4.5 167.0 33.2 21.8 0.42 15.61 3.10 2.04
E. Br. Neponset 10/1/52 - 5/6/08 3.3 147.1 22.0 17.7 0.31 13.75 2.05 1.65Monatiquot 3/31/06 - 5/6/08 1.9 200.2 39.2 17.5 0.18 18.71 3.67 1.64
E. Br. Neponset 10/1/52 - 5/6/08 1.1 348.1 16.0 9.4 0.10 32.54 1.50 0.88Monatiquot 3/31/06 - 5/6/08 0.4 58.2 11.9 4.8 0.04 5.44 1.11 0.45
E. Br. Neponset 10/1/52 - 5/6/08 0.2 144.8 7.8 5.1 0.02 13.53 0.73 0.48Monatiquot 3/31/06 - 5/6/08 0.2 11.6 2.8 1.4 0.02 1.08 0.26 0.13
E. Br. Neponset 10/1/52 - 5/6/08 0.3 535.0 8.4 4.3 0.02 50.00 0.78 0.40Monatiquot 3/31/06 - 5/6/08 0.2 7.1 2.1 1.3 0.02 0.66 0.19 0.12
E. Br. Neponset 10/1/52 - 5/6/08 0.2 142.8 8.5 4.7 0.02 13.35 0.79 0.44Monatiquot 3/31/06 - 5/6/08 0.2 43.2 3.4 0.9 0.02 4.04 0.32 0.08
E. Br. Neponset 10/1/52 - 5/6/08 0.7 303.3 12.5 6.7 0.06 28.35 1.17 0.63Monatiquot 3/31/06 - 5/6/08 0.3 88.0 15.4 5.4 0.03 8.22 1.44 0.51
E. Br. Neponset 10/1/52 - 5/6/08 1.4 191.2 18.7 14.2 0.13 17.87 1.74 1.32Monatiquot 3/31/06 - 5/6/08 0.9 30.6 12.6 12.3 0.09 2.86 1.18 1.15
E. Br. Neponset 10/1/52 - 5/6/08 2.2 243.5 25.3 20.1 0.21 22.76 2.37 1.88Monatiquot 3/31/06 - 5/6/08 0.2 200.2 19.7 10.3 0.02 18.71 1.84 0.96
E. Br. Neponset 10/1/52 - 5/6/08 0.2 535.0 20.6 14.6 0.02 50.00 1.92 1.36
Month Flow (cfs) Flow per Drainage Area (cfs/mi2)Period of RecordGage
ANNUAL
SEP
OCT
NOV
DEC
MAY
JUN
JUL
AUG
JAN
FEB
MAR
APR
Note: A range of flow statistics for Cochato River at former diversion (drainage area = 10.7 mi2) have been estimated by adjusting to the Monatiquot River gage (drainage area = 28.7 mi2) and the East Branch Neponset River gage (drainage area = 27.2 mi2).
Feasibility Analysis to Restore A-6 Existing Data Report River Herring to the Fore River June 2008
Table A-6: Annual and Monthly Flow Statistics for Cochato River at Monatiquot River
Min Max Mean Median Min Max Mean MedianMonatiquot 3/31/06 - 5/6/08 7.0 30.6 17.0 18.6 0.63 2.75 1.53 1.67
E. Br. Neponset 10/1/52 - 5/6/08 2.9 261.6 28.0 22.4 0.26 23.57 2.52 2.02Monatiquot 3/31/06 - 5/6/08 2.7 126.1 30.5 27.1 0.24 11.36 2.75 2.44
E. Br. Neponset 10/1/52 - 5/6/08 3.6 178.3 29.6 24.9 0.32 16.07 2.66 2.24Monatiquot 3/31/06 - 5/6/08 5.8 119.1 40.9 36.0 0.52 10.73 3.68 3.24
E. Br. Neponset 10/1/52 - 5/6/08 6.9 333.4 38.4 31.8 0.63 30.04 3.46 2.87Monatiquot 3/31/06 - 5/6/08 4.3 148.5 27.2 16.2 0.38 13.38 2.45 1.46
E. Br. Neponset 10/1/52 - 5/6/08 6.1 210.6 36.6 30.6 0.55 18.97 3.30 2.76Monatiquot 3/31/06 - 5/6/08 4.6 173.3 34.4 22.6 0.42 15.61 3.10 2.04
E. Br. Neponset 10/1/52 - 5/6/08 3.4 152.6 22.8 18.4 0.31 13.75 2.05 1.65Monatiquot 3/31/06 - 5/6/08 2.0 207.7 40.7 18.2 0.18 18.71 3.67 1.64
E. Br. Neponset 10/1/52 - 5/6/08 1.1 361.2 16.6 9.8 0.10 32.54 1.50 0.88Monatiquot 3/31/06 - 5/6/08 0.4 60.3 12.4 5.0 0.04 5.44 1.11 0.45
E. Br. Neponset 10/1/52 - 5/6/08 0.2 150.2 8.1 5.3 0.02 13.53 0.73 0.48Monatiquot 3/31/06 - 5/6/08 0.2 12.0 2.9 1.4 0.02 1.08 0.26 0.13
E. Br. Neponset 10/1/52 - 5/6/08 0.3 555.0 8.7 4.5 0.02 50.00 0.78 0.40Monatiquot 3/31/06 - 5/6/08 0.2 7.3 2.2 1.3 0.02 0.66 0.19 0.12
E. Br. Neponset 10/1/52 - 5/6/08 0.2 148.1 8.8 4.9 0.02 13.35 0.79 0.44Monatiquot 3/31/06 - 5/6/08 0.2 44.9 3.6 0.9 0.02 4.04 0.32 0.08
E. Br. Neponset 10/1/52 - 5/6/08 0.7 314.6 13.0 6.9 0.06 28.35 1.17 0.63Monatiquot 3/31/06 - 5/6/08 0.3 91.3 16.0 5.6 0.03 8.22 1.44 0.51
E. Br. Neponset 10/1/52 - 5/6/08 1.5 198.3 19.3 14.7 0.13 17.87 1.74 1.32Monatiquot 3/31/06 - 5/6/08 1.0 31.7 13.1 12.8 0.09 2.86 1.18 1.15
E. Br. Neponset 10/1/52 - 5/6/08 2.3 252.6 26.3 20.8 0.21 22.76 2.37 1.88Monatiquot 3/31/06 - 5/6/08 0.2 207.7 20.4 10.6 0.02 18.71 1.84 0.96
E. Br. Neponset 10/1/52 - 5/6/08 0.2 555.0 21.4 15.1 0.02 50.00 1.92 1.36
Month Flow (cfs) Flow per Drainage Area (cfs/mi2)Period of RecordGage
ANNUAL
SEP
OCT
NOV
DEC
MAY
JUN
JUL
AUG
JAN
FEB
MAR
APR
Note: A range of flow statistics for Cochato River at Monatiquot River (drainage area = 11.1 mi2) have been estimated by adjusting to the Monatiquot River gage (drainage area = 28.7 mi2) and the East Branch Neponset River gage (drainage area = 27.2 mi2).
Feasibility Analysis to Restore A-7 Existing Data Report River Herring to the Fore River June 2008
Table A-7: Annual and Monthly Flow Statistics for Monatiquot River at Hollingsworth Dam
Min Max Mean Median Min Max Mean MedianMonatiquot 3/31/06 - 5/6/08 16.2 71.3 39.6 43.3 0.63 2.75 1.53 1.67
E. Br. Neponset 10/1/52 - 5/6/08 6.9 610.4 65.4 52.4 0.26 23.57 2.52 2.02Monatiquot 3/31/06 - 5/6/08 6.3 294.2 71.2 63.2 0.24 11.36 2.75 2.44
E. Br. Neponset 10/1/52 - 5/6/08 8.3 416.1 69.0 58.1 0.32 16.07 2.66 2.24Monatiquot 3/31/06 - 5/6/08 13.5 278.0 95.4 83.9 0.52 10.73 3.68 3.24
E. Br. Neponset 10/1/52 - 5/6/08 16.2 778.0 89.6 74.3 0.63 30.04 3.46 2.87Monatiquot 3/31/06 - 5/6/08 9.9 346.5 63.5 37.9 0.38 13.38 2.45 1.46
E. Br. Neponset 10/1/52 - 5/6/08 14.3 491.3 85.4 71.4 0.55 18.97 3.30 2.76Monatiquot 3/31/06 - 5/6/08 10.8 404.3 80.3 52.8 0.42 15.61 3.10 2.04
E. Br. Neponset 10/1/52 - 5/6/08 8.0 356.1 53.2 42.8 0.31 13.75 2.05 1.65Monatiquot 3/31/06 - 5/6/08 4.7 484.6 94.9 42.4 0.18 18.71 3.67 1.64
E. Br. Neponset 10/1/52 - 5/6/08 2.7 842.7 38.8 22.9 0.10 32.54 1.50 0.88Monatiquot 3/31/06 - 5/6/08 1.0 140.8 28.9 11.7 0.04 5.44 1.11 0.45
E. Br. Neponset 10/1/52 - 5/6/08 0.6 350.4 18.9 12.4 0.02 13.53 0.73 0.48Monatiquot 3/31/06 - 5/6/08 0.5 28.0 6.8 3.3 0.02 1.08 0.26 0.13
E. Br. Neponset 10/1/52 - 5/6/08 0.6 1295.0 20.2 10.5 0.02 50.00 0.78 0.40Monatiquot 3/31/06 - 5/6/08 0.4 17.1 5.0 3.1 0.02 0.66 0.19 0.12
E. Br. Neponset 10/1/52 - 5/6/08 0.6 345.7 20.6 11.4 0.02 13.35 0.79 0.44Monatiquot 3/31/06 - 5/6/08 0.4 104.7 8.3 2.2 0.02 4.04 0.32 0.08
E. Br. Neponset 10/1/52 - 5/6/08 1.6 734.2 30.3 16.2 0.06 28.35 1.17 0.63Monatiquot 3/31/06 - 5/6/08 0.7 213.0 37.3 13.1 0.03 8.22 1.44 0.51
E. Br. Neponset 10/1/52 - 5/6/08 3.4 462.8 45.1 34.3 0.13 17.87 1.74 1.32Monatiquot 3/31/06 - 5/6/08 2.3 74.0 30.6 29.8 0.09 2.86 1.18 1.15
E. Br. Neponset 10/1/52 - 5/6/08 5.4 589.4 61.3 48.6 0.21 22.76 2.37 1.88Monatiquot 3/31/06 - 5/6/08 0.4 484.6 47.6 24.8 0.02 18.71 1.84 0.96
E. Br. Neponset 10/1/52 - 5/6/08 0.6 1295.0 49.9 35.2 0.02 50.00 1.92 1.36
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
ANNUAL
SEP
OCT
NOV
DEC
Month Flow (cfs) Flow per Drainage Area (cfs/mi2)Period of RecordGage
Note: A range of flow statistics for Monatiquot River at Hollingsworth Dam (drainage area = 25.9 mi2) have been estimated by adjusting to the Monatiquot River gage (drainage area = 28.7 mi2) and the East Branch Neponset River gage (drainage area = 27.2 mi2).
Feasibility Analysis to Restore A-8 Existing Data Report River Herring to the Fore River June 2008
Comparison of Annual Flow Duration Curves for theMonatiquot River (No. 01105583) and East Branch Neponset River (No. 01105500) Gages
0
20
40
60
80
100
120
140
160
180
200
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Monatiquot (2006-2008)
East Br Neponset (2006-2008)
East Br Neponset (1952-2008)
Note: Flow data for the East Branch Neponset River gage (drainage area = 27.2 mi2) have been multiplied by a factor of 1.06 to reflect the drainage area at the Monatiquot River gage (28.7 mi2).
FIGURE A-1
Regression Relationship between Monatiquot River and East Branch Neponset RiverAnnual Flows from 3/31/06 to 5/6/08
y = 0.9901x - 6.3975R2 = 0.8488
0
100
200
300
400
500
600
700
0 100 200 300 400 500 600 700
East Branch Neponset River Flow (cfs)
Mon
atiq
uot R
iver
Flo
w (c
fs)
FIGURE A-2
Feasibility Analysis to Restore A-9 Existing Data Report River Herring to the Fore River June 2008
Comparison of January Flow Duration Curves for theMonatiquot River (No. 01105583) and East Branch Neponset River (No. 01105500) Gages
0
20
40
60
80
100
120
140
160
180
200
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Monatiquot (2007-2008)
East Br Neponset (2007-2008)
East Br Neponset (1953-2008)
Note: Flow data for the East Branch Neponset River gage (drainage area = 27.2 mi2) have been multiplied by a factor of 1.06 to reflect the drainage area at the Monatiquot River gage (28.7 mi2).
FIGURE A-3
Regression Relationship between Monatiquot River and East Branch Neponset RiverJanuary Flows from 3/31/06 to 5/6/08
y = 0.781x - 1.1484R2 = 0.7088
10
20
30
40
50
60
70
80
90
100
10 30 50 70 90 110 130
East Branch Neponset River Flow (cfs)
Mon
atiq
uot R
iver
Flo
w (c
fs)
FIGURE A-4
Feasibility Analysis to Restore A-10 Existing Data Report River Herring to the Fore River June 2008
Comparison of February Flow Duration Curves for theMonatiquot River (No. 01105583) and East Branch Neponset River (No. 01105500) Gages
0
20
40
60
80
100
120
140
160
180
200
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Monatiquot (2006-2008)
East Br Neponset (2006-2008)
East Br Neponset (1952-2008)
Note: Flow data for the East Branch Neponset River gage (drainage area = 27.2 mi2) have been multiplied by a factor of 1.06 to reflect the drainage area at the Monatiquot River gage (28.7 mi2).
FIGURE A-5
Regression Relationship between Monatiquot River and East Branch Neponset RiverFebruary Flows from 3/31/06 to 5/6/08
y = 0.7651x + 12.146R2 = 0.7462
0
50
100
150
200
250
300
350
400
0 50 100 150 200 250 300 350 400 450 500
East Branch Neponset River Flow (cfs)
Mon
atiq
uot R
iver
Flo
w (c
fs)
FIGURE A-6
Feasibility Analysis to Restore A-11 Existing Data Report River Herring to the Fore River June 2008
Comparison of March Flow Duration Curves for theMonatiquot River (No. 01105583) and East Branch Neponset River (No. 01105500) Gages
0
20
40
60
80
100
120
140
160
180
200
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Monatiquot (2007-2008)
East Br Neponset (2007-2008)
East Br Neponset (1952-2008)
Note: Flow data for the East Branch Neponset River gage (drainage area = 27.2 mi2) have been multiplied by a factor of 1.06 to reflect the drainage area at the Monatiquot River gage (28.7 mi2).
FIGURE A-7
Regression Relationship between Monatiquot River and East Branch Neponset RiverMarch Flows from 3/31/06 to 5/6/08
y = 0.8811x + 8.9704R2 = 0.6532
0
50
100
150
200
250
300
350
0 50 100 150 200 250 300 350
East Branch Neponset River Flow (cfs)
Mon
atiq
uot R
iver
Flo
w (c
fs)
FIGURE A-8
Feasibility Analysis to Restore A-12 Existing Data Report River Herring to the Fore River June 2008
Comparison of April Flow Duration Curves for theMonatiquot River (No. 01105583) and East Branch Neponset River (No. 01105500) Gages
0
20
40
60
80
100
120
140
160
180
200
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Monatiquot (2006-2008)
East Br Neponset (2006-2008)
East Br Neponset (1953-2008)
Note: Flow data for the East Branch Neponset River gage (drainage area = 27.2 mi2) have been multiplied by a factor of 1.06 to reflect the drainage area at the Monatiquot River gage (28.7 mi2).
FIGURE A-9
Regression Relationship between Monatiquot River and East Branch Neponset RiverApril Flows from 3/31/06 to 5/6/08
y = 0.9697x - 6.9925R2 = 0.8909
0
50
100
150
200
250
300
350
400
450
0 50 100 150 200 250 300 350 400 450 500
East Branch Neponset River Flow (cfs)
Mon
atiq
uot R
iver
Flo
w (c
fs)
FIGURE A-10
Feasibility Analysis to Restore A-13 Existing Data Report River Herring to the Fore River June 2008
Comparison of May Flow Duration Curves for theMonatiquot River (No. 01105583) and East Branch Neponset River (No. 01105500) Gages
0
20
40
60
80
100
120
140
160
180
200
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Monatiquot (2006-2008)
East Br Neponset (2006-2008)
East Br Neponset (1953-2008)
Note: Flow data for the East Branch Neponset River gage (drainage area = 27.2 mi2) have been multiplied by a factor of 1.06 to reflect the drainage area at the Monatiquot River gage (28.7 mi2).
FIGURE A-11
Regression Relationship between Monatiquot River and East Branch Neponset River May Flows from 3/31/06 to 5/6/08
y = 1.2367x - 15.531R2 = 0.8753
0
50
100
150
200
250
300
350
400
450
500
0 50 100 150 200 250 300 350 400
East Branch Neponset River Flow (cfs)
Mon
atiq
uot R
iver
Flo
w (c
fs)
FIGURE A-12
Feasibility Analysis to Restore A-14 Existing Data Report River Herring to the Fore River June 2008
Comparison of June Flow Duration Curves for theMonatiquot River (No. 01105583) and East Branch Neponset River (No. 01105500) Gages
0
20
40
60
80
100
120
140
160
180
200
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Monatiquot (2006-2007)
East Br Neponset (2006-2007)
East Br Neponset (1953-2007)
Note: Flow data for the East Branch Neponset River gage (drainage area = 27.2 mi2) have been multiplied by a factor of 1.06 to reflect the drainage area at the Monatiquot River gage (28.7 mi2).
FIGURE A-13
Regression Relationship between Monatiquot River and East Branch Neponset River June Flows from 3/31/06 to 5/6/08
y = 0.9801x + 0.9318R2 = 0.8309
0
100
200
300
400
500
600
700
0 100 200 300 400 500 600 700
East Branch Neponset River Flow (cfs)
Mon
atiq
uot R
iver
Flo
w (c
fs)
FIGURE A-14
Feasibility Analysis to Restore A-15 Existing Data Report River Herring to the Fore River June 2008
Comparison of July Flow Duration Curves for theMonatiquot River (No. 01105583) and East Branch Neponset River (No. 01105500) Gages
0
20
40
60
80
100
120
140
160
180
200
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Monatiquot (2006-2007)
East Br Neponset (2006-2007)
East Br Neponset (1953-2007)
Note: Flow data for the East Branch Neponset River gage (drainage area = 27.2 mi2) have been multiplied by a factor of 1.06 to reflect the drainage area at the Monatiquot River gage (28.7 mi2).
FIGURE A-15
Regression Relationship between Monatiquot River and East Branch Neponset River July Flows from 3/31/06 to 5/6/08
y = 1.3576x - 12.862R2 = 0.8879
0
20
40
60
80
100
120
140
160
180
200
0 20 40 60 80 100 120 140 160
East Branch Neponset River Flow (cfs)
Mon
atiq
uot R
iver
Flo
w (c
fs)
FIGURE A-16
Feasibility Analysis to Restore A-16 Existing Data Report River Herring to the Fore River June 2008
Comparison of August Flow Duration Curves for theMonatiquot River (No. 01105583) and East Branch Neponset River (No. 01105500) Gages
0
20
40
60
80
100
120
140
160
180
200
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Monatiquot (2006-2007)
East Br Neponset (2006-2007)
East Br Neponset (1953-2007)
Note: Flow data for the East Branch Neponset River gage (drainage area = 27.2 mi2) have been multiplied by a factor of 1.06 to reflect the drainage area at the Monatiquot River gage (28.7 mi2).
FIGURE A-17
Regression Relationship between Monatiquot River and East Branch Neponset River August Flows from 3/31/06 to 5/6/08
y = 0.6369x - 3.469R2 = 0.8052
0
5
10
15
20
25
30
35
40
0 10 20 30 40 50 60 70
East Branch Neponset River Flow (cfs)
Mon
atiq
uot R
iver
Flo
w (c
fs)
FIGURE A-18
Feasibility Analysis to Restore A-17 Existing Data Report River Herring to the Fore River June 2008
Comparison of September Flow Duration Curves for theMonatiquot River (No. 01105583) and East Branch Neponset River (No. 01105500) Gages
0
20
40
60
80
100
120
140
160
180
200
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Monatiquot (2006-2007)
East Br Neponset (2006-2007)
East Br Neponset (1953-2007)
Note: Flow data for the East Branch Neponset River gage (drainage area = 27.2 mi2) have been multiplied by a factor of 1.06 to reflect the drainage area at the Monatiquot River gage (28.7 mi2).
FIGURE A-19
Regression Relationship between Monatiquot River and East Branch Neponset River September Flows from 3/31/06 to 5/6/08
y = 0.3092x + 1.3261R2 = 0.248
0
5
10
15
20
25
0 10 20 30 40 50 60 70
East Branch Neponset River Flow (cfs)
Mon
atiq
uot R
iver
Flo
w (c
fs)
FIGURE A-20
Feasibility Analysis to Restore A-18 Existing Data Report River Herring to the Fore River June 2008
Comparison of October Flow Duration Curves for theMonatiquot River (No. 01105583) and East Branch Neponset River (No. 01105500) Gages
0
20
40
60
80
100
120
140
160
180
200
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Monatiquot (2006-2007)
East Br Neponset (2006-2007)
East Br Neponset (1952-2007)
Note: Flow data for the East Branch Neponset River gage (drainage area = 27.2 mi2) have been multiplied by a factor of 1.06 to reflect the drainage area at the Monatiquot River gage (28.7 mi2).
FIGURE A-21
Regression Relationship between Monatiquot River and East Branch Neponset River October Flows from 3/31/06 to 5/6/08
y = 0.635x - 4.1875R2 = 0.6232
0
20
40
60
80
100
120
140
0 50 100 150 200 250
East Branch Neponset River Flow (cfs)
Mon
atiq
uot R
iver
Flo
w (c
fs)
FIGURE A-22
Feasibility Analysis to Restore A-19 Existing Data Report River Herring to the Fore River June 2008
Comparison of November Flow Duration Curves for theMonatiquot River (No. 01105583) and East Branch Neponset River (No. 01105500) Gages
0
20
40
60
80
100
120
140
160
180
200
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Monatiquot (2006-2007)
East Br Neponset (2006-2007)
East Br Neponset (1952-2007)
Note: Flow data for the East Branch Neponset River gage (drainage area = 27.2 mi2) have been multiplied by a factor of 1.06 to reflect the drainage area at the Monatiquot River gage (28.7 mi2).
FIGURE A-23
Regression Relationship between Monatiquot River and East Branch Neponset River November Flows from 3/31/06 to 5/6/08
y = 0.9087x - 6.0583R2 = 0.7998
0
50
100
150
200
250
300
0 50 100 150 200 250 300 350
East Branch Neponset River Flow (cfs)
Mon
atiq
uot R
iver
Flo
w (c
fs)
FIGURE A-24
Feasibility Analysis to Restore A-20 Existing Data Report River Herring to the Fore River June 2008
Comparison of December Flow Duration Curves for theMonatiquot River (No. 01105583) and East Branch Neponset River (No. 01105500) Gages
0
20
40
60
80
100
120
140
160
180
200
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Monatiquot (2006-2007)
East Br Neponset (2006-2007)
East Br Neponset (1952-2007)
Note: Flow data for the East Branch Neponset River gage (drainage area = 27.2 mi2) have been multiplied by a factor of 1.06 to reflect the drainage area at the Monatiquot River gage (28.7 mi2).
FIGURE A-25
Regression Relationship between Monatiquot River and East Branch Neponset River December Flows from 3/31/06 to 5/6/08
y = 0.832x - 2.653R2 = 0.8967
0
20
40
60
80
100
120
0 20 40 60 80 100 120 140
East Branch Neponset River Flow (cfs)
Mon
atiq
uot R
iver
Flo
w (c
fs)
FIGURE A-26
Feasibility Analysis to Restore A-21 Existing Data Report River Herring to the Fore River June 2008
Annual Flow Duration Curve for Great Pond Dam OutletBased on adjusted data from the Monatiquot River and East Branch Neponset River Gages
0
5
10
15
20
25
30
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Adjusted from Monatiquot Gage (3/06 - 5/08)
Adjusted from E Branch Neponset Gage(10/52 - 5/08)
FIGURE A-27
Drainage Areas (mi2): Monatiquot Gage: 28.7 E Branch Neponset Gage: 27.2 Great Pond Dam Outlet: 6.1
Annual Flow Duration Curve for Sunset Lake Dam OutletBased on adjusted data from the Monatiquot River and East Branch Neponset River Gages
0.0
0.5
1.0
1.5
2.0
2.5
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Adjusted from Monatiquot Gage (3/06 - 5/08)
Adjusted from E Branch Neponset Gage (10/52 - 5/08)
FIGURE A-28
Drainage Areas (mi2): Monatiquot Gage: 28.7 E Branch Neponset Gage: 27.2 Sunset Lake Dam Outlet: 0.5
Feasibility Analysis to Restore A-22 Existing Data Report River Herring to the Fore River June 2008
Annual Flow Duration Curve for Farm River at Monatiquot RiverBased on adjusted data from the Monatiquot River and East Branch Neponset River Gages
0
10
20
30
40
50
60
70
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Adjusted from Monatiquot Gage (3/06 - 5/08)
Adjusted from E Branch Neponset Gage (10/52 - 5/08)
FIGURE A-29
Drainage Areas (mi2): Monatiquot Gage: 28.7 E Branch Neponset Gage: 27.2 Farm River at Monatiquot River: 12.9
Annual Flow Duration Curve for Cochato River at Former DiversionBased on adjusted data from the Monatiquot River and East Branch Neponset River Gages
0
5
10
15
20
25
30
35
40
45
50
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Adjusted from Monatiquot Gage (3/06 - 5/08)
Adjusted from E Branch Neponset Gage (10/52 - 5/08)
FIGURE A-30
Drainage Areas (mi2): Monatiquot Gage: 28.7 E Branch Neponset Gage: 27.2 Cochato River at Former Diversion: 10.7
Feasibility Analysis to Restore A-23 Existing Data Report River Herring to the Fore River June 2008
Annual Flow Duration Curve for Cochato River Monatiquot RiverBased on adjusted data from the Monatiquot River and East Branch Neponset River Gages
0
10
20
30
40
50
60
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Adjusted from Monatiquot Gage (3/06 - 5/08)
Adjusted from E Branch Neponset Gage (10/52 - 5/08)
FIGURE A-31
Drainage Areas (mi2): Monatiquot Gage: 28.7 E Branch Neponset Gage: 27.2 Cochato River at Monatiquot River: 11.1
Annual Flow Duration Curve for Monatiquot River at Hollingsworth DamBased on adjusted data from the Monatiquot River and East Branch Neponset River Gages
0
20
40
60
80
100
120
140
0 10 20 30 40 50 60 70 80 90 100
Percent of Time Flow is Equaled or Exceeded
Flow
(cfs
)
Adjusted from Monatiquot Gage (3/06 - 5/08)
Adjusted from E Branch Neponset Gage (10/52 - 5/08)
FIGURE A-32
Drainage Areas (mi2): Monatiquot Gage: 28.7 E Branch Neponset Gage: 27.2 Monatiquot River at Hollingsworth Dam: 25.9
Appendix B: Water Level Records
Tabl
e B
-1:
Wat
er L
evel
Dat
a fo
r Ric
hard
i Res
ervo
ir, U
pper
Pon
d, a
nd L
ower
(Gre
at) P
ond
from
Aug
ust 2
005
to P
rese
nt
Ele
vatio
n (ft
)V
olum
e (M
G)
% F
ull
Ele
vatio
n (ft
)V
olum
e (M
G)
% F
ull
Ele
vatio
n (ft
)V
olum
e (M
G)
% F
ull
8/8/
2005
8/14
/200
58/
15/2
005
125.
8953
6.4
90.0
%99
.62
150.
497
.0%
132.
1436
6.2
56.0
%8/
15/2
005
8/21
/200
58/
22/2
005
126.
0754
8.3
92.0
%98
.91
148.
896
.0%
133.
0241
2.0
63.0
%8/
22/2
005
8/28
/200
58/
29/2
005
126.
1956
0.2
94.0
%95
.12
133.
386
.0%
133.
2741
8.6
64.0
%8/
29/2
005
9/4/
2005
9/5/
2005
125.
2750
0.6
84.0
%97
.29
142.
692
.0%
134.
2549
7.0
76.0
%9/
5/20
059/
11/2
005
9/12
/200
512
6.56
584.
198
.0%
94.2
912
4.0
80.0
%13
3.77
431.
666
.0%
9/17
/200
59/
25/2
005
9/26
/200
512
5.52
518.
587
.0%
91.8
711
3.2
73.0
%13
5.39
549.
484
.0%
9/17
/200
59/
25/2
005
9/26
/200
512
5.52
518.
587
.0%
93.6
212
4.0
80.0
%13
5.35
549.
484
.0%
9/26
/200
510
/2/2
005
10/3
/200
512
5.52
572.
296
.0%
95.6
213
6.4
88.0
%13
3.52
431.
666
.0%
10/3
/200
510
/9/2
005
10/1
0/20
0512
6.39
584.
198
.0%
98.9
514
8.8
96.0
%13
5.44
549.
484
.0%
10/1
0/20
0510
/16/
2005
10/1
7/20
0512
6.77
596.
010
0.0%
101.
6215
5.0
100.
0%13
6.77
654.
010
0.0%
10/2
4/20
0510
/30/
2005
10/3
1/20
0512
6.77
596.
010
0.0%
101.
6215
5.0
100.
0%13
6.77
654.
010
0.0%
3/13
/200
63/
19/2
006
3/20
/200
612
6.48
584.
198
.0%
101.
6215
5.0
100.
0%13
4.27
497.
076
.0%
3/30
/200
64/
5/20
064/
6/20
0612
6.54
584.
198
.0%
101.
6215
5.0
100.
0%13
4.02
484.
074
.0%
4/24
/200
64/
30/2
006
5/1/
2006
125.
9454
8.3
92.0
%10
1.62
155.
010
0.0%
133.
7745
7.8
70.0
%5/
1/20
065/
7/20
065/
8/20
0612
6.06
554.
393
.0%
100.
3215
1.9
98.0
%13
4.48
510.
178
.0%
5/8/
2006
5/14
/200
65/
15/2
006
126.
7759
6.0
100.
0%10
1.62
155.
010
0.0%
136.
7765
4.0
100.
0%9/
11/2
006
9/17
/200
69/
18/2
006
125.
2746
4.9
78.0
%10
1.62
155.
010
0.0%
130.
7728
7.8
44.0
%10
/9/2
006
10/1
5/20
0610
/16/
2006
125.
9654
2.4
91.0
%89
.62
99.2
64.0
%13
2.44
405.
562
.0%
11/6
/200
611
/12/
2006
11/1
3/20
0612
5.77
530.
489
.0%
97.2
913
8.0
89.0
%13
4.44
497.
076
.0%
11/6
/200
611
/12/
2006
11/1
3/20
0612
5.77
530.
489
.0%
97.2
913
8.0
89.0
%13
4.44
497.
076
.0%
11/1
3/20
0611
/19/
2006
11/2
0/20
0612
6.31
572.
296
.0%
97.2
915
1.9
98.0
%13
4.77
582.
189
.0%
6/18
/200
76/
24/2
007
6/25
/200
712
6.48
524.
588
.0%
101.
6215
5.0
100.
0%13
4.27
536.
382
.0%
7/16
/200
712
6.47
572.
296
.0%
100.
0015
1.7
97.9
%13
1.77
313.
948
.0%
7/23
/200
712
6.23
572.
296
.0%
95.6
613
4.9
87.0
%13
2.36
313.
948
.0%
8/6/
2007
126.
3556
6.2
95.0
%89
.12
91.5
59.0
%13
3.19
313.
948
.0%
9/7/
2007
125.
2548
8.7
82.0
%86
.62
60.5
39.0
%13
1.33
313.
948
.0%
9/24
/200
712
5.27
500.
684
.0%
90.9
010
5.4
68.0
%12
8.27
183.
128
.0%
10/1
/200
712
4.89
484.
381
.3%
91.3
011
0.0
71.0
%12
7.52
156.
924
.0%
10/9
/200
712
4.68
470.
879
.0%
92.1
211
4.7
74.0
%12
6.77
130.
820
.0%
10/1
5/20
0712
4.18
435.
073
.0%
92.6
211
9.3
77.0
%12
6.77
130.
820
.0%
10/2
2/20
0712
4.93
482.
781
.0%
88.1
288
.357
.0%
126.
2711
1.1
17.0
%10
/29/
2007
124.
6847
0.8
79.0
%85
.87
58.9
38.0
%12
6.00
104.
616
.0%
12/1
0/20
0712
4.24
435.
073
.0%
89.6
297
.663
.0%
125.
4391
.514
.0%
12/2
4/20
0712
3.97
417.
270
.0%
92.6
211
9.4
77.0
%12
6.02
111.
117
.0%
12/3
1/20
0712
4.68
464.
878
.0%
99.4
614
8.8
96.0
%12
6.93
137.
321
.0%
12/3
1/20
0712
4.68
464.
878
.0%
99.4
614
8.8
96.0
%12
6.93
137.
321
.0%
1/6/
2008
124.
6849
4.6
83.0
%99
.28
148.
896
.0%
128.
1818
3.1
28.0
%1/
15/2
007
126.
0755
4.2
93.0
%10
1.62
155.
010
0.0%
129.
7724
8.5
38.0
%1/
22/2
008
126.
0758
4.0
98.0
%10
1.62
155.
010
0.0%
130.
9330
0.8
46.0
%1/
28/2
008
126.
3157
2.1
96.0
%10
0.12
151.
998
.0%
131.
7734
6.6
53.0
%2/
4/20
0812
6.31
554.
293
.0%
101.
0315
3.4
99.0
%13
2.52
385.
859
.0%
2/25
/200
812
6.93
560.
294
.0%
102.
3715
1.7
97.9
%13
6.77
523.
280
.0%
Ric
hard
i Res
ervo
irU
pper
Pon
dG
reat
Pon
dSt
art
Dat
eEn
dD
ate
Rep
ort
Dat
e
Appendix C: Records from Massachusetts Dam Safety on:
Hollingsworth Dam (also called Armstrong Dam) Sunset Lake Dam Great Pond Dam
Hollingsworth Dam (also called Armstrong Dam)
Sunset Lake Dam
Great Pond Dam
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