North Platte River Basin Water Supply and Utilization Report Wyoming Area Office Report for June 2019 The Wyoming Area Office of the Bureau of Reclamation is responsible for the operation of Reclamation reservoirs in Wyoming east of the Continental Divide except for Keyhole Reservoir. Four off-stream reservoirs in Nebraska commonly referred to as the Inland Lakes also fall within the Wyoming Area. The North Platte River Basin Reservoirs have a combined storage capacity of 2,800,000 acre-feet. The major reservoirs in the Shoshone and Wind/Bighorn Basins have a combined storage capacity of 1,600,000 acre-feet. United States of America Department of the Interior Bureau of Reclamation P.O. Box 1630 Mills, Wyoming 82644-1630
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North Platte River BasinWater Supply and Utilization ReportWyoming Area OfficeReport for June 2019
The Wyoming Area Office of the Bureau of Reclamation is responsible for the operation of Reclamation reservoirs inWyoming east of the Continental Divide except for Keyhole Reservoir. Four off-stream reservoirs in Nebraska commonlyreferred to as the Inland Lakes also fall within the Wyoming Area. The North Platte River Basin Reservoirs have acombined storage capacity of 2,800,000 acre-feet. The major reservoirs in the Shoshone and Wind/Bighorn Basins have a combined storage capacity of 1,600,000 acre-feet.
United States of AmericaDepartment of the InteriorBureau of ReclamationP.O. Box 1630Mills, Wyoming 82644-1630
This report concerns the operation of Reclamation facilities in the North PlatteRiver Basin.
Reclamation defines a water year as the time period of October 1 through September 30.Water year is abbreviated in this report as W. Yr.
Other organizations furnished information for the Water Supply and Utilization Report.Their cooperation is greatly appreciated.
This report is available on the Internet and can be accessed byfollowing these steps:
1. Log on to the Great Plains Home Page at: http://www.usbr.gov/gp2. On left side of page Select Water Operations.3. Under Water Operations Select Water Management Information.4. Under Water Management Select Water Supply Report.5. Under North Platte River Basin, select Current Month or reports from the previous 12 months.
NORTH PLATTE RIVER BASINWYOMING AREA OFFICE
Report for June 2019WATER SUPPLY AND UTILIZATION REPORT
Page 1
NORTH PLATTE RIVER BASIN INFLOW
(1000 acre-feet)
Accumulated InflowHistorical Inflow
W. Yr. 30 Yr. % of W. Yr. W. Yr. W. Yr. W. Yr. 30 Yr. % of2019 Avg. 5 Avg. 2018 2017 2016 2019 Avg. 5 Avg.
Seminoe 437.1 276.3 158 104.2 268.3 407.0 940.1 784.1 120Pathfinder 1, 2 18.7 21.0 89 10.0 51.0 12.1 97.9 99.5 98Glendo 3 53.9 25.5 211 19.2 24.6 18.3 256.5 198.9 129Guernsey 4 10.8 5.7 190 3.2 -1.7 4.0 43.0 32.4 133System Total 520.6 328.5 158 136.6 342.2 441.4 1337.5 1114.9 1201 It is assumed that there is no gain between Seminoe and Kortes Dams.2 River gain between Kortes and Pathfinder Dams.3 River gain between Pathfinder and Glendo Dams.4 River gain between Glendo and Guernsey Dams.5 30 year average. (1989-2018)
RESERVOIR INFLOWJune
JuneInflow
NORTH PLATTE RIVER BASIN
(October - June)June
Reservoir
0
50
100
150
200
250
300
350
400
450
500
Seminoe Pathfinder Glendo Guernsey
ACRE
-FEE
T X
1000
RESERVOIR
Average 2019 2018 2017 2016
Page 2
NORTH PLATTE RIVER BASIN OUTFLOW
(1000 acre-feet)
Accumulated OutflowOutflow Historical Outflow (October - June)
W. Yr. 30 Yr. % of W. Yr. W. Yr. W. Yr. W. Yr. 30 Yr. % of2019 Avg. 2 Avg. 2018 2017 2016 2019 Avg. 2 Avg.
Seminoe 237.5 162.0 147 96.0 220.8 356.2 678.8 637.4 106Kortes 237.2 162.0 146 96.0 220.9 356.5 678.4 637.3 106Pathfinder 88.5 163.9 54 161.9 230.0 378.4 351.9 568.5 62Alcova 78.0 149.1 52 149.1 214.9 363.1 337.6 540.6 62Gray Reef 77.8 149.0 52 148.8 214.3 363.0 337.2 540.4 62Glendo 1 161.1 165.2 1 97 158.4 248.5 346.0 261.0 395.2 66Guernsey 174.6 170.3 103 160.6 247.9 347.9 278.8 363.6 77
1 In 1993 an outlet was constructed at Glendo Dam which is used to provide a flow of approximately 25 cubic feet per second, 25 year average (1994-2018).2 30 year average (1989-2018).
NORTH PLATTE RIVER BASINRESERVOIR OUTFLOW
June
JuneJune
Reservoir
0
50
100
150
200
250
300
350
400
Seminoe Kortes Pathfinder Alcova Gray Reef Glendo Guernsey
ACRE
-FEE
T X
1000
RESERVOIR
Average 2019 2018 2017 2016
Page 3
NORTH PLATTE RIVER BASIN RESERVOIR STORAGE
(1000 acre-feet)
Total Storage End of June Total PercentEnd of June Historical Storage Conservation of
W. Yr. 30 Yr. % of W. Yr. W. Yr. W. Yr. Storage Capacity2019 Avg. 1 Avg. 2018 2017 2016 Capacity
Seminoe 914.2 721.0 127 772.2 884.5 908.1 1017.3 90Kortes 5.1 4.7 108 4.7 4.7 4.7 4.7 108Pathfinder 991.4 628.3 158 844.7 1039.8 1064.2 1070.0 93Alcova 180.5 180.4 100 180.1 180.8 180.8 184.4 98Gray Reef 1.5 1.4 104 1.7 1.7 1.7 1.8 81Glendo 482.3 471.4 102 432.1 461.2 581.4 492.0 98Guernsey 28.8 30.9 93 28.6 28.0 31.2 45.6 63Total 2603.7 2038.1 128 2264.1 2600.7 2772.1 2815.8 921 Average is based on the 1989-2018 period.
NORTH PLATTE RIVER BASINRESERVOIR STORAGE
End of June
Reservoir
0
200
400
600
800
1000
1200
Seminoe Kortes Pathfinder Alcova Gray Reef Glendo Guernsey
ACR
E-FE
ET X
100
0
RESERVOIR
Average 2019 2018 2017 2016
Page 4
NORTH PLATTE RIVER BASIN RESERVOIR STORAGE OWNERSHIP
(1000 acre-feet)
Ownership of water End of June PercentEnd of June Historical Ownership of
W. Yr. 30 Yr. % of W. Yr. W. Yr. W. Yr. Capacity2019 Avg. 5 Avg. 2018 2017 2016
Kendrick 1201.7 904.6 133 1084.5 1201.7 1201.7 1201.7 100North Platte 1 1115.6 877.6 127 1009.4 1115.4 1115.2 1115.6 100Glendo 171.7 150.3 114 158.2 171.7 171.7 171.7 100Inland Lakes 2 0.0 0.0 N/A 0.0 0.0 0.0 42.9 0Cheyenne 3,7 3.2 1.3 246 1.6 4.2 5.4 15.7 20PacifiCorp 4 2.0 1.7 118 2.0 2.0 2.0 2.0 100WWDC N/A N/A N/A 0.0 0.0 0.0 N/A N/AOther 6 109.5 102.3 107 8.4 105.9 276.2 N/A N/A
1 This includes North Platte Guernsey and North Platte Pathfinder.2 Water stored temporarily in mainstem facilities for later transfer to the Inland Lakes. This table does not reflect water currently stored in the Inland Lakes.3 The City of Cheyenne has a storage contract to store water in Seminoe Reservoir by exchange of Upper North Platte Basin water through a system of trans-basin diversions.4 PacifiCorp has a storage contract to store water in Glendo Reservoir for Dave Johnston Powerplant. 5 Average is based on the 1989-2018 period.6 Water which is captured in the re-regulation space of Glendo in addition to storage rights, operational water account, and replacement of evaporation losses is labeled as "Re-regulation of Natural Flow" per Wyoming Board of Control Order Docket Number I-2000-3-8 in water Division Number One. In accordance with 2019 Natural Flow and Ownership Procedures, the June operational account can contain up to 15,000 acre-feet. On June 30, 2019, the Operational account contained 15,000 Acre-feet, the Re-Regulation space contained 94,529 Acre-feet.7 Cheyenne ownership was increased to 15,700 AF on March 13, 2009 as a result of Amendment No. 1 to Contract No. 06XX6A0062.
Total Storage CapacityOwnership
Page 5
( acre-feet)30 Year Percent of Total
Reservoir Average 5 Average StorageCapacity
Lake Alice 7,692 5,800 133 11,034 1
Little Lake Alice 313 300 6 104 1,166 2
Lake Winters Creek 1,394 1,000 6 139 1,746 3
Lake Minatare 53,590 45,700 117 58,795 4
1 At Elevation 4182.0 2 At Elevation 4139.03 At Elevation 4125.04 At Elevation 4125.05 30 year average. (1989-2018)6 28 year average. (1991-2018)
OWNERSHIP OF WATEREnd of June
INLAND LAKES RESERVOIR STORAGE
NORTH PLATTE RIVER BASIN
End of JuneStorage
Total
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
Kendrick North Platte Glendo InlandLakes
Cheyenne PacifiCorp WWDC Other
ACR
E-FE
ET X
100
0
Average 2019 2018 2017 2016
Page 6
NORTH PLATTE RIVER BASIN GROSS GENERATION
(Energy in giga-watt hours)
June JuneGross Generation Historical Generation
W. Yr. 30 Yr. % of W. Yr. W. Yr. W. Yr. W. Yr. 30 Yr. % of2019 Avg. 2 Avg. 2018 2017 2016 2019 Avg. 2 Avg.
Seminoe 29.4 19.5 151 14.4 28.5 29.6 96.2 87.9 109Kortes 28.8 18.3 157 16.0 17.5 27.8 105.9 90.3 117Fremont Canyon 1 25.3 31.2 81 42.3 46.1 45.7 65.8 127.1 52Alcova 10.5 16.7 63 20.8 27.0 27.1 39.1 63.1 62Glendo 17.6 15.2 116 16.9 25.5 26.3 24.7 33.4 74Guernsey 4.2 3.4 124 3.6 2.2 4.1 9.5 8.4 1131 The powerplant for Pathfinder Dam is Fremont Canyon.2 Average is based on the 1989-2018 period.
June
Accumulated Gross Gen.(October - June)
NORTH PLATTE RIVER BASINGROSS GENERATION
Powerplant
0
5
10
15
20
25
30
35
40
45
50
Seminoe Kortes Fremont Canyon Alcova Glendo Guernsey
GW
H
POWERPLANT
Average 2019 2018 2017 2016
Page 7
SWE in inches ¹
W. Yr. 30 Yr. % of W. Yr. W. Yr. W. Yr.2019 3 Median ² Median 2018 2017 2016
Seminoe Reservoir 4.7 0.0 0.0 0.0 0.0Pathfinder Reservoir 0.1 0.0 0.0 0.0 0.0Glendo Reservoir 0.0 0.0 0.0 0.0 0.0
Seminoe Reservoir Watershed Pathfinder Reservoir WatershedSWE in inches ¹ SWE in inches ¹
Stations Water 30 Yr. Stations Water 30 Yr.(Elevation) Content 3 Median ² (Elevation) Content 3 Median ²
Brooklyn (10,200) 0.0 0.0 South Pass (9,040) 0.1 0.0Columbine Lodge(9,160) 0.0 0.0 Deer Park (9,700) 0.1 0.0Divide Peak (8,880) 0.0 0.0 Watershed Average 0.1 0.0Joe Wright (10,120) 0.0 0.0North French (10,130) 4.7 0.0Old Battle (9,800) 11.1 0.0 Glendo Reservoir WatershedSand Lake (10,050) 11.1 0.0 SWE in inches ¹South Brush (8,440) 0.0 0.0 Stations Water 30 Yr.Tower (10,500) 24.9 0.0 (Elevation) Content 3 Median ²Webber Springs (9,250) 0.0 0.0 Casper (7,900) 0.0 0.0Willow Creek Pass (9,540) 0.0 0.0 Laprele Creek (8,375) 0.0 0.0Watershed Average 4.7 0.0 Reno Hill (8,500) 0.0 0.0
Windy Peak (7,900) 0.0 0.0Watershed Average 0.0 0.0
¹ SWE (Snow Water Equivalent is the amount of water in the snowpack expressed in inches)² Median for the 1981-2010 period3 Data from NRCS Snowpack Telemetry Network (SNOTEL) Sites.
N/AN/AN/A
NORTH PLATTE SNOWPACK WATER CONTENT
snow-water contentJuly 1, 2019
snow-water contentComparative July 1
WATERSHED
Page 8
NORTH PLATTE ESTIMATED APRIL-JULY RUNOFF
(1000 acre-feet)July 1, 2019 Forecast 30 Yr. Comparative Actual
Forecast of April-July Runoff April-July April - July RunoffPoints Reasonable Reasonable Runoff W. Yr. W. Yr. W. Yr. W. Yr.
Maximum¹ Minimum¹ Avg. ² 2018 2017 2016 2015Seminoe Reservoir 1225 725 683 150 393 683 1030 654Sweetwater RiverAbove PathfinderReservoirAlcova to Glendo 265 165 134 161 71 135 301 196¹ The probability is estimated to be 9 chances in 10 that the actual volume will fall between the reasonable minimum and reasonable maximum.² Average is based on the 1988-2017 period.
(1000 acre-feet)
ForecastPoints
95% 75% 50% % of Avg 25% 5%SeminoeReservoir 725 902 1025 150 1107 1225Sweetwater RiverAbove PathfinderReservoir 40 55 65 121 75 90Alcova to GlendoGain 165 195 215 161 235 265¹ Average is based on the 1989-2018 period.
75 5890 65 40 54 121
1,025
215
Expected % of Avg.Expected
134
July 1, 2019 Forecast of April-July Runoff 30 Yr.April-July
Chance of Exceeding RunoffAvg. ¹
683
54
44 128
Page 9
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