241 SKUNK RIVER BASIN 05471500 SOUTH SKUNK RIVER NEAR OSKALOOSA, IA LOCATION.--Lat 41°21'21", long 92°39'26"(revised), in NW 1 ⁄ 4 SW 1 ⁄ 4 sec.25, T.76 N., R.16 W., Mahaska County, Hydrologic Unit 07080105, on left bank downstream from bridge on U.S. Highway 63, 0.3 mi downstream from Painter Creek, 4.0 mi north of Oskaloosa, 52.0 mi upstream from confluence with North Skunk River, and at mile 147.3 upstream from mouth of Skunk River. DRAINAGE AREA.--1,635 mi 2 . PERIOD OF RECORD.--October 1945 to current year. Prior to October 1966, published as "Skunk River near Oskaloosa." Prior to October 1948, monthly discharge only, published in WSP 1308. REVISED RECORDS.--WSP 1438: Drainage area. WDR IA-95-1: Location. GAGE.--Water-stage recorder. Datum of gage is 685.50 ft above NGVD of 1929. Prior to Nov. 21, 1947, nonrecording gage at site 400 ft downstream at same datum. Gage was moved to the left bank on downstream side of the Highway 63 bridge on May 3, 1995. Accubar pressure sensor installed at site on May 3, 1995. REMARKS.--Records good except those for estimated daily discharges, which are poor. U.S. Army Corps of Engineers rain gage and data collection platform with satellite telemetry at station. Precipitation records are available online at the U.S. Army Corps of Engineers website: www2.mvr.usace.army.mil/ WaterControl/datamining2.cfm. EXTREMES OUTSIDE PERIOD OF RECORD.--Flood in May 1944 reached a stage of 25.8 ft, from floodmarks, discharge, 37,000 ft 3 /s, from rating curve extended above 18,000 ft 3 /s on basis of velocity-area study. DISCHARGE, CUBIC FEET PER SECOND WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 81 72 252 414 e231 2,380 1,940 e1,170 7,400 1,250 601 503 2 79 96 236 420 e272 2,290 1,730 e1,120 6,030 1,190 733 442 3 80 382 231 429 e249 2,220 1,600 e1,080 4,980 1,380 665 402 4 79 2,940 241 e278 e240 1,960 1,470 e1,040 4,020 1,950 1,680 377 5 77 3,430 254 e201 e251 3,010 1,370 995 3,390 1,700 1,300 351 6 74 1,560 253 e188 e251 3,800 1,300 956 2,980 1,770 1,380 388 7 73 1,020 245 e213 e240 3,930 1,250 915 2,640 2,310 1,240 649 8 72 790 243 e229 e249 2,930 1,190 862 2,390 1,840 983 827 9 71 640 262 e221 e260 2,340 1,120 848 2,130 1,590 832 563 10 70 543 403 e227 e274 1,960 1,050 869 1,980 1,970 731 455 11 69 507 e337 e236 e274 1,720 976 861 2,010 2,350 642 398 12 68 457 e478 e248 e258 1,530 930 859 1,890 5,160 579 356 13 74 409 e567 e252 e251 1,390 894 825 2,090 4,690 528 320 14 89 379 e608 e243 e252 1,340 874 922 3,110 3,450 486 296 15 113 371 e568 e235 e242 1,300 845 1,190 2,950 2,580 453 276 16 100 357 e464 e250 e249 1,280 818 1,340 2,360 2,200 425 270 17 88 327 e374 e345 e249 1,270 895 1,200 2,880 1,880 405 257 18 88 322 e323 e395 e264 1,360 969 1,870 3,010 1,630 506 245 19 85 326 e341 e315 e279 1,910 871 2,020 3,560 1,470 488 242 20 84 306 e377 e291 e1,010 2,210 900 1,690 2,670 1,340 436 231 21 81 293 e402 e294 e2,420 2,040 1,510 1,530 2,210 1,240 395 217 22 77 283 e445 e274 e2,620 1,770 2,010 1,460 2,540 1,210 367 209 23 75 299 e399 e268 e3,330 1,600 1,670 3,810 2,840 1,270 341 203 24 75 296 e355 e268 e3,740 1,500 1,480 6,970 2,500 1,120 347 197 25 77 256 e299 e268 e3,380 1,420 1,400 8,990 2,050 1,010 380 192 26 75 271 404 e268 e2,510 1,380 e1,450 10,700 1,800 910 367 187 27 73 271 587 e253 1,690 1,370 e1,400 11,300 1,660 839 364 185 28 73 262 538 e237 1,780 1,490 e1,340 11,500 1,540 778 1,890 183 29 73 233 402 e228 2,190 2,140 e1,280 10,900 1,430 717 1,210 179 30 75 245 392 e215 --- 2,700 e1,220 9,770 1,330 709 817 170 31 72 --- 400 e210 --- 2,270 --- 8,880 --- 669 615 --- TOTAL 2,440 17,943 11,680 8,413 29,505 61,810 37,752 108,442 84,370 54,172 22,186 9,770 MEAN 78.7 598 377 271 1,017 1,994 1,258 3,498 2,812 1,747 716 326 MAX 113 3,430 608 429 3,740 3,930 2,010 11,500 7,400 5,160 1,890 827 MIN 68 72 231 188 231 1,270 818 825 1,330 669 341 170 AC-FT 4,840 35,590 23,170 16,690 58,520 122,600 74,880 215,100 167,300 107,500 44,010 19,380 CFSM 0.05 0.37 0.23 0.17 0.62 1.22 0.77 2.14 1.72 1.07 0.44 0.20 IN. 0.06 0.41 0.27 0.19 0.67 1.41 0.86 2.47 1.92 1.23 0.50 0.22 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1946 - 2004, BY WATER YEAR (WY) MEAN 482 536 440 441 800 1,594 1,598 1,767 2,157 1,418 646 457 MAX 3,646 3,576 2,322 3,906 3,587 4,841 5,366 6,168 9,222 11,770 7,772 5,140 (WY) (1987) (1984) (1983) (1973) (1973) (1979) (1983) (1974) (1947) (1993) (1993) (1993) MIN 8.47 14.5 7.55 5.30 42.9 45.9 42.1 74.2 39.4 27.3 43.3 27.8 (WY) (1957) (1957) (1956) (1956) (1954) (1954) (1956) (1956) (1977) (1977) (1988) (1956)
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SKUNK RIVER BASIN 241 05471500 SOUTH SKUNK RIVER NEAR ... · SKUNK RIVER BASIN 243 05472500 NORTH SKUNK RIVER NEAR SIGOURNEY, IA LOCATION.--Lat 41°18'03", long 92°12'16", in NE1⁄
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241SKUNK RIVER BASIN
05471500 SOUTH SKUNK RIVER NEAR OSKALOOSA, IA
LOCATION.--Lat 41°21'21", long 92°39'26"(revised), in NW1⁄4 SW1⁄4 sec.25, T.76 N., R.16 W., Mahaska County, Hydrologic Unit 07080105, on left bank downstream from bridge on U.S. Highway 63, 0.3 mi downstream from Painter Creek, 4.0 mi north of Oskaloosa, 52.0 mi upstream from confluence with North Skunk River, and at mile 147.3 upstream from mouth of Skunk River.
DRAINAGE AREA.--1,635 mi2.
PERIOD OF RECORD.--October 1945 to current year. Prior to October 1966, published as "Skunk River near Oskaloosa." Prior to October 1948, monthly discharge only, published in WSP 1308.
GAGE.--Water-stage recorder. Datum of gage is 685.50 ft above NGVD of 1929. Prior to Nov. 21, 1947, nonrecording gage at site 400 ft downstream at same datum. Gage was moved to the left bank on downstream side of the Highway 63 bridge on May 3, 1995. Accubar pressure sensor installed at site on May 3, 1995.
REMARKS.--Records good except those for estimated daily discharges, which are poor. U.S. Army Corps of Engineers rain gage and data collection platform with satellite telemetry at station. Precipitation records are available online at the U.S. Army Corps of Engineers website: www2.mvr.usace.army.mil/WaterControl/datamining2.cfm.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood in May 1944 reached a stage of 25.8 ft, from floodmarks, discharge, 37,000 ft3/s, from rating curve extended above 18,000 ft3/s on basis of velocity-area study.
DISCHARGE, CUBIC FEET PER SECOND WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
05471500 SOUTH SKUNK RIVER NEAR OSKALOOSA, IA—Continued
SUMMARY STATISTICS FOR 2003 CALENDAR YEAR FOR 2004 WATER YEAR WATER YEARS 1946 - 2004
ANNUAL TOTAL 267,125 448,483ANNUAL MEAN 732 1,225 1,028HIGHEST ANNUAL MEAN 3,884 1993LOWEST ANNUAL MEAN 40.1 1956HIGHEST DAILY MEAN 7,810 May 10 11,500 May 28 20,400 Jul 15, 1993LOWEST DAILY MEAN 41 Feb 16 68 Oct 12 1.8 Oct 11, 1956ANNUAL SEVEN-DAY MINIMUM 48 Feb 12 71 Oct 6 2.0 Oct 7, 1956MAXIMUM PEAK FLOW 11,500 May 28 20,700 Jul 15, 1993MAXIMUM PEAK STAGE 22.57 May 28 24.78 Jul 15, 1993ANNUAL RUNOFF (AC-FT) 529,800 889,600 744,700ANNUAL RUNOFF (CFSM) 0.448 0.749 0.629ANNUAL RUNOFF (INCHES) 6.08 10.20 8.5410 PERCENT EXCEEDS 2,060 2,630 2,55050 PERCENT EXCEEDS 254 641 44090 PERCENT EXCEEDS 74 184 58
e Estimated
O N D2003
J F M A M J J A S2004
10
20
50
100100
200
500
1,0001,000
2,000
5,000
10,00010,000
20,000
50,000
100,000
DIS
CH
AR
GE,
IN C
UB
IC F
EET
PER
SEC
ON
D
243SKUNK RIVER BASIN
05472500 NORTH SKUNK RIVER NEAR SIGOURNEY, IA
LOCATION.--Lat 41°18'03", long 92°12'16", in NE1⁄4 SE1⁄4 sec.14, T.75 N., R.12 W., Keokuk County, Hydrologic Unit 07080106, on right bank 10 ft downstream from bridge on State Highway 149, 1.2 mi downstream from Cedar Creek, 2.2 mi south of Sigourney, 4.0 mi upstream from Bridge Creek, and 16.2 mi upstream from confluence with South Skunk River.
GAGE.--Water stage recorder. Datum of gage is 651.53 ft above NGVD of 1929. Prior to June 10, 1953, nonrecording gage at same site and datum.
REMARKS.--Records good except those estimated daily discharges, which are poor. U.S. Army Corps of Engineers rain gage and data collection platform with satellite telemetry at station. Precipitation records are available online at the U.S. Army Corps of Engineers website: www2.mvr.usace.army.mil/WaterControl/datamining2.cfm.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood in May 1944 reached a stage of 22.8 ft, from floodmark, discharge, 14,500 ft3/s.
DISCHARGE, CUBIC FEET PER SECOND WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
05472500 NORTH SKUNK RIVER NEAR SIGOURNEY, IA—Continued
SUMMARY STATISTICS FOR 2003 CALENDAR YEAR FOR 2004 WATER YEAR WATER YEARS 1946 - 2004
ANNUAL TOTAL 92,709 155,457ANNUAL MEAN 254 425 476HIGHEST ANNUAL MEAN 2,041 1993LOWEST ANNUAL MEAN 27.7 1956HIGHEST DAILY MEAN 2,770 May 11 3,160 May 28 23,200 Mar 31, 1960LOWEST DAILY MEAN 17 Oct 10 17 Oct 10 a 0.10 Oct 7, 1956ANNUAL SEVEN-DAY MINIMUM 18 Oct 8 18 Oct 8 0.10 Oct 7, 1956MAXIMUM PEAK FLOW 3,200 May 28 27,500 Mar 31, 1960MAXIMUM PEAK STAGE 14.95 May 28 25.33 Mar 31, 1960INSTANTANEOUS LOW FLOW 15 Oct 10ANNUAL RUNOFF (AC-FT) 183,900 308,300 345,100ANNUAL RUNOFF (CFSM) 0.348 0.582 0.653ANNUAL RUNOFF (INCHES) 4.72 7.92 8.8710 PERCENT EXCEEDS 614 951 1,17050 PERCENT EXCEEDS 111 240 16690 PERCENT EXCEEDS 26 59 20
a Also Oct. 11-13. e Estimated
O N D2003
J F M A M J J A S2004
10
20
50
100100
200
500
1,0001,000
2,000
5,000
10,000
DIS
CH
AR
GE,
IN C
UB
IC F
EET
PER
SEC
ON
D
245SKUNK RIVER BASIN
05473400 CEDAR CREEK NEAR OAKLAND MILLS, IA
LOCATION.--(revised) Lat. 40°55'31", long 91°40'27", in SE1⁄4 NW1⁄4 sec.28, T.71 N., R.7 W., Henry County, Hydrologic Unit 07080107, on left bank 30 ft upstream from bridge on county highway H46, 3.0 mi west of Oakland Mills, 2.9 mi upstream from Wolf Creek, and 4.3 mi upstream from mouth.
DRAINAGE AREA.--530 mi2.
PERIOD OF RECORD.--Occasional low-flow measurements, water years 1957 to 1977. July 1977 to current year.
GAGE.--Water-stage recorder. Datum of gage is 565.07 ft above NGVD of 1929.
REMARKS.--Records good except those for estimated daily discharges, which are poor. Occasional high-water measurements were made by U.S. Army Corps of Engineers in 1965, 1966, 1970, and 1974 and by U.S. Geological Survey in 1966 and 1967. U.S. Army Corps of Engineers rain gage and data collection platform with satellite telemetry at station. Precipitation records are available online at the U.S. Army Corps of Engineers website: www2.mvr.usace.army.mil/WaterControl/datamining2.cfm.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of April 22, 1973 reached a stage of 24.09 ft, discharge not determined. Flood of June 1905 reached a stage approximately 2 feet higher from information by local resident.
DISCHARGE, CUBIC FEET PER SECOND WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
05473400 CEDAR CREEK NEAR OAKLAND MILLS, IA—Continued
SUMMARY STATISTICS FOR 2003 CALENDAR YEAR FOR 2004 WATER YEAR WATER YEARS 1978 - 2004
ANNUAL TOTAL 20,441.25 87,863.8ANNUAL MEAN 56.0 240 380HIGHEST ANNUAL MEAN 1,424 1993LOWEST ANNUAL MEAN 44.5 2003HIGHEST DAILY MEAN 1,260 May 11 5,920 Jun 1 11,500 May 28, 1996LOWEST DAILY MEAN 0.87 Sep 12 1.4 Oct 6 0.42 Sep 17, 1988ANNUAL SEVEN-DAY MINIMUM 1.6 Oct 5 1.6 Oct 5 0.55 Sep 14, 1988MAXIMUM PEAK FLOW 6,300 Jun 1 12,300 May 28, 1996MAXIMUM PEAK STAGE 17.48 Jun 1 21.27 Jul 9, 1993INSTANTANEOUS LOW FLOW 1.4 Oct 6 aANNUAL RUNOFF (AC-FT) 40,550 174,300 275,100ANNUAL RUNOFF (CFSM) 0.105 0.450 0.712ANNUAL RUNOFF (INCHES) 1.43 6.13 9.6810 PERCENT EXCEEDS 110 576 86950 PERCENT EXCEEDS 14 51 7290 PERCENT EXCEEDS 2.7 6.9 7.3
a Also Oct. 10, 11. e Estimated.
O N D2003
J F M A M J J A S2004
1
2
5
1010
20
50
100100
200
500
1,0001,000
2,000
5,000
10,000
DIS
CH
AR
GE,
IN C
UB
IC F
EET
PER
SEC
ON
D
247SKUNK RIVER BASIN
05473450 BIG CREEK NEAR MT. PLEASANT, IA
LOCATION.--Lat. 45°00'26", long 91°33'05", in NW1⁄4 SE1⁄4 sec.28, T.72 N., R.6 W., Henry County, Hydrologic Unit 07080107, on right bank 20 ft upstream from bridge on old U.S. highway 218 (Mt. Pleasant business route) about 2 miles north of Mt. Pleasant, 1.6 miles upstream from Brandy Wine Creek, and 2.3 miles upstream from Lynn Creek.
DRAINAGE AREA.--58 mi2.
PERIOD OF RECORD.--Occasional low-flow measurements, water years 1957 to 1977. Oct. 1, 1997 to current year.
GAGE.--Water-stage recorder. Datum of gage is 643.00 ft above NGVD of 1929.
REMARKS.--Records good except those for estimated daily discharges, which are poor. U.S. Geological Survey data collection platform with satellite telemetry at station.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Apr. 21, 1973, discharge 9,580 ft3/s, on basis of contracted-opening measurement.
DISCHARGE, CUBIC FEET PER SECOND WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
05473450 BIG CREEK NEAR MT. PLEASANT, IA—Continued
SUMMARY STATISTICS FOR 2003 CALENDAR YEAR FOR 2004 WATER YEAR WATER YEARS 1997 - 2004
ANNUAL TOTAL 5,163.16 9,521.75ANNUAL MEAN 14.1 26.0 38.8HIGHEST ANNUAL MEAN 68.1 1998LOWEST ANNUAL MEAN 12.1 2003HIGHEST DAILY MEAN 370 May 5 473 Mar 5 1,600 Mar 31, 1998LOWEST DAILY MEAN 0.00 Aug 23 0.09 Oct 2 a 0.00 Aug 23, 2003 bANNUAL SEVEN-DAY MINIMUM 0.02 Aug 19 0.10 Oct 1 0.02 Aug 19, 2003MAXIMUM PEAK FLOW 556 Mar 5 2,450 Jun 1, 2002MAXIMUM PEAK STAGE 6.92 Mar 5 14.29 Feb 9, 2001INSTANTANEOUS LOW FLOW 0.08 Oct 2 c 0.00 Aug 22, 2003ANNUAL RUNOFF (AC-FT) 10,240 18,890 28,110ANNUAL RUNOFF (CFSM) 0.244 0.449 0.669ANNUAL RUNOFF (INCHES) 3.31 6.11 9.0910 PERCENT EXCEEDS 31 67 9150 PERCENT EXCEEDS 1.5 12 8.590 PERCENT EXCEEDS 0.14 0.47 0.44
a Also Oct. 7. b Also Aug. 24, 25. c Also Oct. 6, 7. e Estimated
O N D2003
J F M A M J J A S2004
0.01
0.02
0.05
0.10.1
0.2
0.5
11
2
5
1010
20
50
100100
200
500
1,000
DIS
CH
AR
GE,
IN C
UB
IC F
EET
PER
SEC
ON
D
249SKUNK RIVER BASIN
05474000 SKUNK RIVER AT AUGUSTA, IA
LOCATION.--Lat 40°45'13", long 91°16'37"(revised), in NE1⁄4 NE1⁄4 sec.26, T.69 N., R.4 W., Des Moines County, Hydrologic Unit 07080107, on left bank 300 ft upstream from bridge on State Highway 394 at Augusta, 2.0 mi upstream from Long Creek, and at mile 12.5.
DRAINAGE AREA.--4,303 mi2.
WATER-DISCHARGE RECORDS
PERIOD OF RECORD.--September to November 1913, October 1914 to current year. Monthly discharge only for some periods, published in WSP 1308.
GAGE.--Water-stage recorder. Datum of gage is 521.24 ft above NGVD of 1929. Prior to Nov. 15, 1913, nonrecording gage at site 400 ft upstream at datum about 0.7 ft higher. May 27, 1915 to Jan. 14, 1935, nonrecording gage at site 400 ft upstream at present datum.
REMARKS.--Records good except those for estimated daily discharges, which are poor. U.S. Army Corps of Engineers data collection platform with satellite telemetry at station.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of June 1, 1903, reached a stage of about 21 ft, discharge, about 45,000 ft3/s. Stage and discharge for flood of April 1973 are believed to be the greatest since 1851.
DISCHARGE, CUBIC FEET PER SECOND WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
SUMMARY STATISTICS FOR 2003 CALENDAR YEAR FOR 2004 WATER YEAR WATER YEARS 1915 - 2004
ANNUAL TOTAL 472,473 911,638ANNUAL MEAN 1,294 2,491 2,565HIGHEST ANNUAL MEAN 10,200 1993LOWEST ANNUAL MEAN 152 1934HIGHEST DAILY MEAN 11,000 May 11 22,100 Jun 2 62,600 Apr 23, 1973LOWEST DAILY MEAN 47 Feb 16 130 Oct 9 a 7.0 Aug 27, 1934ANNUAL SEVEN-DAY MINIMUM 54 Feb 13 132 Oct 7 7.4 Aug 26, 1934MAXIMUM PEAK FLOW 22,600 Jun 2 66,800 Apr 23, 1973MAXIMUM PEAK STAGE 16.40 Jun 2 27.05 Apr 23, 1973INSTANTANEOUS LOW FLOW 122 Oct 30 7.0 Aug 7, 1934ANNUAL RUNOFF (AC-FT) 937,200 1,808,000 1,858,000ANNUAL RUNOFF (CFSM) 0.300 0.578 0.595ANNUAL RUNOFF (INCHES) 4.08 7.86 8.0810 PERCENT EXCEEDS 3,700 5,800 6,74050 PERCENT EXCEEDS 570 1,320 1,06090 PERCENT EXCEEDS 130 240 150
a Also Oct. 13, and 30. e Estimated.
O N D2003
J F M A M J J A S2004
100
200
500
1,0001,000
2,000
5,000
10,00010,000
20,000
50,000
100,000
DIS
CH
AR
GE,
IN C
UB
IC F
EET
PER
SEC
ON
D
251SKUNK RIVER BASIN
05474000 SKUNK RIVER AT AUGUSTA, IA—Continued
WATER QUALITY RECORDS
LOCATION.--Samples collected at bridge on State Highway 394, 300 ft downstream from gage.
PERIOD OF RECORD.--October 1975 to current year.
PERIOD OF DAILY RECORD.-- SPECIFIC CONDUCTANCE: October 1975 to current year. WATER TEMPERATURES: October 1975 to current year. SUSPENDED-SEDIMENT DISCHARGE: October 1975 to current year.
REMARKS.--During periods of ice effect, sediment samples are collected in open water channel. Records of specific conductance are obtained from suspended-sediment samples at time of analysis.
EXTREMES FOR PERIOD OF DAILY RECORD.-- SPECIFIC CONDUCTANCE: Maximum daily, 950 microsiemens Dec. 20, 1979, Feb. 12, 1980; minimum daily, 149 microsiemens Mar. 6, 1993. WATER TEMPERATURES: Maximum daily, 34.0°C July 20, 1980, Aug. 15-17, 1988, July 10-13, 1989, and July 15, 1995, and July 30, 1999; minimum
daily, 0.0°C on many days during winter periods. SEDIMENT CONCENTRATIONS: Maximum daily mean, 8,550 mg/L June 25, 1981; minimum daily mean, 1 mg/L Mar. 8, 9, 12, 1978, Jan. 5, 6, 1984. SEDIMENT LOADS: Maximum daily, 499,000 tons Mar. 21, 1978; minimum daily, 0.93 tons Feb. 11, 2003.
EXTREMES FOR CURRENT YEAR.-- SPECIFIC CONDUCTANCE: Maximum daily, 692 microsiemens Feb. 4; minimum daily, 262 microsiemens May 31. WATER TEMPERATURES: Maximum daily, 30.0°C Aug. 3, Sept. 5; minimum daily, 0.0°C many days during winter period. SEDIMENT CONCENTRATIONS: Maximum daily mean, 3,270 mg/L Mar. 6; minimum daily mean, 5.0 mg/L Feb. 7. SEDIMENT LOADS: Maximum daily, 126,000 tons Mar. 6; minimum daily, 5.8 tons Feb. 7.
WATER-QUALITY DATA, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
Date Time
Instan-taneous
dis-charge,
cfs(00061)
Temper-ature,water,deg C
(00010)
Suspnd.sedi-ment,sieve
diametrpercent
<.063mm(70331)
Sus-pendedsedi-ment
concen-trationmg/L
(80154)
Sus-pendedsedi-mentdis-
charge,tons/d
(80155)
NOV13... 0955 911 4.1 99 105 258
DEC15... 1310 639 -- 99 60 104
MAY12... 1355 1,560 -- 94 98 413
JUN09... 1045 6,580 -- 89 311 5,530
JUL20... 1330 2,470 -- 98 233 1,550
AUG31... 0940 3,470 -- 97 476 4,460
WATER-QUALITY DATA, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
Date Time
Bedsedi-ment,
dry svdsve diapercent
<.063mm(80164)
Bedsedi-ment,
dry svdsve diapercent
<.125mm(80165)
Bedsedi-ment,
dry svdsve diapercent<.25mm(80166)
Bedsedi-ment,
dry svdsve diapercent<.5 mm(80167)
Bedsedi-ment,
dry svdsve diapercent<1 mm(80168)
Bedsedi-ment,
dry svdsve diapercent<2 mm(80169)
Bedsedi-ment,
dry svdsve diapercent<4 mm(80170)
Bedsedi-ment,
dry svdsve diapercent<8 mm(80171)
Bedsedi-ment,
dry svdsve diapercent<16 mm(80172)
Numberof
sam-pling
points,count
(00063)
MAR16... 1120 .0 .0 10 68 90 96 98 99 100 2
MAY12... 1400 .0 .0 12 84 98 99 100 100 -- 2
JUN09... 1115 .0 .0 9 82 95 98 99 99 100 2
JUL20... 1400 .0 .0 3 65 96 98 99 99 100 3
AUG31... 1000 4 7 25 63 87 95 98 100 -- 2
252 SKUNK RIVER BASIN
05474000 SKUNK RIVER AT AUGUSTA, IA—Continued
SPECIFIC CONDUCTANCE, WATER, UNFILTERED, LABORATORY, MICROSIEMENS PER CENTIMETER AT 25 DEGREES CELSIUS WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
DAILY INSTANTANEOUS VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
SUSPENDED-SEDIMENT—CONTINUEDWATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
Day
Meanconcen-tration(mg/l)
Load(tons/day)
Meanconcen-tration(mg/l)
Load(tons/day)
Meanconcen-tration(mg/l)
Load(tons/day)
Meanconcen-tration(mg/l)
Load(tons/day)
Meanconcen-tration(mg/l)
Load(tons/day)
Meanconcen-tration(mg/l)
Load(tons/day)
258 SKUNK RIVER BASIN
05474000 SKUNK RIVER AT AUGUSTA, IA—Continued
O N D2003
J F M A M J J A S2004
1
2
5
1010
20
50
100100
200
500
1,0001,000
2,000
5,000
10,00010,000
20,000
50,000
100,000100,000
200,000
500,000
1,000,000
SUSP
EN
DE
D-S
ED
IME
NT
DIS
CH
AR
GE
,IN
TO
NS
PER
DA
Y
259MISSISSIPPI RIVER MAIN STEM
05474500 MISSISSIPPI RIVER AT KEOKUK, IA
LOCATION.--Lat 40°23'37", long 91°22'27", in SE1⁄4 SW1⁄4 sec.30, T.65 N., R.4 W., Lee County, Hydrologic Unit 07080104, near right bank in tailwater of dam and powerplant of Union Electric Co. at Keokuk, 0.2 mi upstream from bridge on U.S. Highway 136, 2.7 mi upstream from Des Moines River, and at mile 364.2 upstream from Ohio River.
DRAINAGE AREA.--119,000 mi2, approximately.
PERIOD OF RECORD.--January 1878 to current year.
GAGE.--Water-stage recorder. Datum of gage is 477.41 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers). Jan. 1, 1878 to May 1913, nonrecording gage at Galland (formerly Nashville), 8 mi upstream; zero of gage was set to low-water mark of 1864, or 496.52 ft above sea level.
REMARKS.--Discharge computed from records of operation of turbines in powerplant and spillway gates in dam. Minor flow regulation caused by powerplant since 1913 and navigation dams. Records for May 1913 to September 1937 adjusted for change in contents in Keokuk Reservoir, those after September 1937 unadjusted.
COOPERATION.--Records provided by Ameren-Union Electric Co.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of June 6, 1851, reached a stage of 21.0 ft, present site and datum, estimated as 13.5 ft at Galland, discharge, 360,000 ft3/s.
DISCHARGE, CUBIC FEET PER SECOND WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP