LOCATION.-- Lat 38°17'12", long 88°52'19" (NAD of 1927), in NE1/4NE1/4 sec.9, T.3 S., R.3 E., Jefferson County, Hydrologic Unit 07140106, on left bank on upstream side of bridge on State Highway 142, 0.2 mi downstream from Sevenmile Creek, about 2 mi southeast of Mt. Vernon, and at mile 18.8. | |
DRAINAGE AREA.-- 76.9 mi2. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
DISCHARGE: October 1985 to current year. | |
STAGE: Water years 1995 to current year. October 1985 to September 1994 (8 AM gage heights). Gage-height record for April 1965 to May 1971 available in files of U.S. Army Corps of Engineers. | |
GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter, and crest-stage gage. Datum of gage is 420.00 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers). | |
REMARKS.-- Sewage-treatment plant upstream at Mt. Vernon. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 16,100 ft3/s, May 17, 1990, gage height 17.03 ft; minimum daily discharge, 0.15 ft3/s, Sept 29, 1989. | |
EXTREMES OUTSIDE PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Flood of Apr. 4, 1968, reached a stage of 14.60 ft, from records of U.S. Army Corps of Engineers. | |
REMARKS FOR CURRENT YEAR.-- Records fair except those for estimated daily discharges, which are poor. Effluent from sewage-treatment plant upstream at Mt. Vernon averaged about 4.5 ft3/s. | |
| Discharge, cubic feet per second, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003
DAILY MEAN VALUES | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
| 1 | 2.6 | 4.4 | 3.8 | 110 | e6.5 | e100 | 24 | 54 | 13 | 7.3 | 3.1 | 13 |
| 2 | 2.6 | 3.5 | 3.7 | 57 | e7.5 | 158 | 21 | 76 | 11 | 14 | 3.8 | 29 |
| 3 | 2.7 | 5.1 | 3.6 | 48 | e9.2 | 79 | 20 | 48 | 16 | 5.0 | 4.8 | 46 |
| 4 | 3.7 | 5.1 | 3.7 | 33 | 13 | 61 | 18 | 281 | 15 | 4.2 | 15 | 8.1 |
| 5 | 2.5 | 7.9 | 4.0 | e25 | 8.5 | 55 | 28 | 2640 | 12 | 3.8 | 5.8 | 4.8 |
| 6 | 2.8 | 7.2 | 4.1 | e21 | e6.3 | 43 | 23 | 1220 | 11 | 3.8 | 3.9 | 3.9 |
| 7 | 2.6 | 3.8 | 4.0 | e17 | e5.5 | 34 | 45 | 826 | 9.4 | 3.9 | 3.5 | 3.6 |
| 8 | 2.3 | 3.5 | 4.5 | e18 | e4.8 | 32 | 35 | 287 | 8.7 | 3.7 | 3.1 | 3.6 |
| 9 | 2.2 | 3.6 | 4.0 | e15 | e4.6 | 27 | 28 | 949 | 7.5 | 3.7 | 2.8 | 3.5 |
| 10 | 2.4 | 48 | 3.8 | e10 | e5.2 | 22 | 24 | 324 | 19 | 4.3 | 2.6 | 3.3 |
| 11 | 2.8 | 22 | 3.8 | e12 | e6.0 | 21 | 21 | 418 | 225 | 3.9 | 2.6 | 3.4 |
| 12 | 2.3 | 4.2 | 3.6 | e8.6 | 6.6 | 155 | 18 | 109 | 1500 | 3.7 | 2.6 | 3.3 |
| 13 | 2.6 | 2.8 | 4.7 | e7.4 | 5.3 | 379 | 16 | 61 | 865 | 3.7 | 2.5 | 3.4 |
| 14 | 2.4 | 3.2 | 5.8 | e8.0 | 25 | 145 | 15 | 44 | 442 | 3.7 | 2.5 | 3.3 |
| 15 | 2.4 | 4.9 | 4.4 | e7.3 | 184 | 79 | 14 | 34 | 84 | 3.4 | 2.5 | 3.1 |
| 16 | 2.2 | 4.0 | 3.7 | e6.6 | 97 | 60 | 15 | 27 | 51 | 3.4 | 2.4 | 3.1 |
| 17 | 2.3 | 3.6 | 3.6 | e6.0 | 52 | 50 | 165 | 49 | 35 | 3.4 | 2.2 | 3.1 |
| 18 | 2.4 | 3.6 | 34 | e5.6 | 39 | 43 | 75 | 107 | 25 | 6.8 | 2.5 | 3.0 |
| 19 | 12 | 4.0 | 322 | e5.2 | 208 | 214 | 46 | 43 | 19 | 4.5 | 2.5 | 2.7 |
| 20 | 3.1 | 3.7 | 99 | e5.4 | 551 | 163 | 206 | 31 | 14 | 3.5 | 2.5 | 2.7 |
| 21 | 2.3 | 3.8 | 30 | e5.6 | 494 | 345 | 87 | 32 | 11 | 3.9 | 2.5 | 2.8 |
| 22 | 2.1 | 4.1 | 16 | e5.2 | 1280 | 116 | 52 | 21 | 9.3 | 3.6 | 2.6 | 4.0 |
| 23 | 2.0 | 4.0 | 11 | e4.8 | 916 | 69 | 37 | 16 | 8.2 | 3.3 | 2.5 | 3.0 |
| 24 | 2.0 | 3.7 | e9.0 | e4.4 | 158 | 53 | 43 | 13 | 7.2 | 3.2 | 2.5 | 2.9 |
| 25 | 12 | 3.7 | e8.0 | e4.5 | e74 | 49 | 1000 | 563 | 6.4 | 3.2 | 2.7 | 2.8 |
| 26 | 4.2 | 3.7 | e7.4 | e4.6 | e56 | 87 | 742 | 130 | 14 | 3.1 | 2.6 | 3.2 |
| 27 | 2.7 | 3.8 | e8.4 | e4.8 | e50 | 56 | 110 | 50 | 14 | 3.1 | 2.7 | 7.4 |
| 28 | 12 | 3.6 | e9.5 | e5.0 | e54 | 45 | 70 | 31 | 8.3 | 3.1 | 2.9 | 3.0 |
| 29 | 77 | 3.2 | e16 | e5.1 | --- | 36 | 140 | 24 | 6.3 | 3.1 | 5.0 | 2.9 |
| 30 | 13 | 3.5 | 43 | e5.2 | --- | 30 | 65 | 18 | 5.2 | 3.1 | 4.3 | 3.1 |
| 31 | 6.7 | --- | 321 | e5.8 | --- | 26 | --- | 16 | --- | 3.3 | 6.2 | --- |
| TOTAL | 196.9 | 185.2 | 1003.1 | 481.1 | 4327.0 | 2832 | 3203 | 8542 | 3472.5 | 129.7 | 109.7 | 185.0 |
| MEAN | 6.35 | 6.17 | 32.4 | 15.5 | 155 | 91.4 | 107 | 276 | 116 | 4.18 | 3.54 | 6.17 |
| MAX | 77 | 48 | 322 | 110 | 1280 | 379 | 1000 | 2640 | 1500 | 14 | 15 | 46 |
| MIN | 2.0 | 2.8 | 3.6 | 4.4 | 4.6 | 21 | 14 | 13 | 5.2 | 3.1 | 2.2 | 2.7 |
| CFSM | 0.08 | 0.08 | 0.42 | 0.20 | 2.01 | 1.19 | 1.39 | 3.58 | 1.51 | 0.05 | 0.05 | 0.08 |
| IN. | 0.10 | 0.09 | 0.49 | 0.23 | 2.09 | 1.37 | 1.55 | 4.13 | 1.68 | 0.06 | 0.05 | 0.09 |
| e Estimated |
| STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1986 - 2003, BY WATER YEAR (WY) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | 10.4 | 82.6 | 60.9 | 105 | 133 | 140 | 170 | 148 | 55.8 | 23.6 | 7.82 | 15.5 |
| MAX | 62.6 | 542 | 233 | 327 | 383 | 456 | 540 | 809 | 279 | 101 | 28.6 | 155 |
| (WY) | 2002 | 1994 | 1991 | 1993 | 1986 | 1989 | 1996 | 1995 | 2000 | 1993 | 2000 | 1993 |
| MIN | 2.86 | 3.16 | 4.51 | 4.75 | 10.4 | 24.1 | 40.0 | 4.46 | 2.98 | 2.71 | 1.65 | 2.06 |
| (WY) | 1996 | 2000 | 1990 | 2000 | 1996 | 2001 | 2001 | 1988 | 1991 | 1991 | 1990 | 1995 |
| SUMMARY STATISTICS | FOR 2002 CALENDAR YEAR | FOR 2003 WATER YEAR | WATER YEARS 1986 - 2003 | |||
|---|---|---|---|---|---|---|
| ANNUAL TOTAL | 31675.5 | 24667.2 | ||||
| ANNUAL MEAN | 86.8 | 67.6 | 79.0 | |||
| HIGHEST ANNUAL MEAN | 123 | 1994 | ||||
| LOWEST ANNUAL MEAN | 21.3 | 1987 | ||||
| HIGHEST DAILY MEAN | 3500 | May 13 | 2640 | May 5 | 9940 | May 18 1995 |
| LOWEST DAILY MEAN | 2.0 | Oct 23, 24 | 2.0 | Oct 23, 24 | 0.15 | Sep 29 1989 |
| ANNUAL SEVEN-DAY MINIMUM | 2.4 | Oct 12 | 2.4 | Oct 12 | 0.38 | Dec 11 1989 |
| MAXIMUM PEAK FLOW | 3050 | May 5 | 16100 | May 17 1990 | ||
| MAXIMUM PEAK STAGE | 13.09 | May 5 | 17.03 | May 17 1990 | ||
| INSTANTANEOUS LOW FLOW | 1.3 | Oct 16 | ||||
| ANNUAL RUNOFF (CFSM) | 1.13 | 0.88 | 1.03 | |||
| ANNUAL RUNOFF (INCHES) | 15.32 | 11.93 | 13.97 | |||
| 10 PERCENT EXCEEDS | 159 | 112 | 116 | |||
| 50 PERCENT EXCEEDS | 8.4 | 7.2 | 11 | |||
| 90 PERCENT EXCEEDS | 2.8 | 2.7 | 2.9 | |||
|