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 good except those for estimated daily discharges, which are poor. Effluent from sewage-treatment plant upstream at Mt. Vernon averaged about 4.2 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 |
| 1 | 3.5 | e3.3 | 6.7 | 13 | e7.5 | 45 | 47 | 216 | 89 | 4.7 | 6.5 | 20 |
| 2 | 2.9 | e3.4 | 6.1 | 15 | e20 | 49 | 37 | 125 | 43 | 51 | 5.2 | 14 |
| 3 | 2.9 | e3.3 | 6.2 | 15 | e75 | 55 | 29 | 58 | 26 | 10 | 4.8 | 12 |
| 4 | 2.9 | e3.2 | 7.0 | 230 | e35 | 1480 | 24 | 35 | 18 | 9.8 | 4.5 | 12 |
| 5 | 2.8 | e3.5 | 7.7 | 319 | e27 | 733 | 20 | 26 | 13 | 84 | 4.7 | 11 |
| 6 | 3.0 | e3.5 | 7.0 | 54 | e26 | 157 | 19 | 20 | 11 | 48 | 4.0 | 11 |
| 7 | 3.2 | e3.3 | 6.2 | 29 | e23 | 72 | 19 | 15 | 9.7 | 20 | 3.8 | 10 |
| 8 | 3.2 | e3.2 | 6.6 | 23 | e20 | 46 | 17 | 13 | 8.7 | 12 | 3.6 | 8.9 |
| 9 | 4.3 | e2.9 | 7.2 | 21 | e20 | 37 | 15 | 11 | 8.5 | 8.6 | 3.9 | 7.0 |
| 10 | 4.5 | e3.7 | 7.8 | 18 | e31 | 29 | 14 | 10 | 7.2 | 8.7 | 3.6 | 5.5 |
| 11 | 2.9 | e5.6 | 6.2 | 15 | e48 | 26 | 15 | 8.8 | 6.7 | 7.3 | 3.1 | 4.8 |
| 12 | e3.2 | e4.5 | 6.0 | 16 | e38 | 22 | 15 | 8.4 | 6.9 | 6.6 | 3.1 | 4.6 |
| 13 | e4.0 | e3.5 | 5.4 | 15 | e28 | 20 | 14 | 16 | 6.9 | 9.6 | 3.1 | 4.5 |
| 14 | 6.9 | e4.8 | 5.1 | 14 | e25 | 19 | 13 | 48 | 7.1 | 6.3 | 3.1 | 4.5 |
| 15 | 4.7 | e3.8 | 5.0 | 14 | e23 | 19 | 12 | 28 | 6.1 | 5.4 | 3.1 | 4.6 |
| 16 | 3.9 | e3.6 | 5.1 | 12 | 21 | 20 | 11 | 17 | 7.0 | 5.0 | 3.0 | 5.0 |
| 17 | 5.6 | e5.5 | 5.0 | 44 | 19 | 21 | 11 | 14 | 20 | 4.9 | 3.1 | 4.9 |
| 18 | e3.3 | e55 | 5.1 | 372 | 18 | 19 | 10 | 13 | 21 | 4.7 | 3.1 | 7.0 |
| 19 | e3.2 | 180 | 5.1 | 68 | 22 | 17 | 9.6 | 20 | 9.4 | 4.6 | 3.6 | 5.2 |
| 20 | e3.0 | 23 | 4.8 | 34 | 36 | 18 | 9.1 | 17 | 7.4 | 4.5 | 5.0 | 4.8 |
| 21 | e3.0 | 11 | 4.8 | e22 | 35 | 18 | 9.5 | 13 | 6.3 | 4.3 | 4.0 | 4.9 |
| 22 | e2.9 | 7.8 | 4.8 | e18 | 24 | 15 | 10 | 10 | 5.7 | 4.3 | 3.2 | 4.7 |
| 23 | e2.9 | 21 | 9.2 | e15 | 20 | 13 | 12 | 10 | 5.3 | 4.9 | 6.2 | 4.6 |
| 24 | e3.0 | 103 | 18 | e13 | 20 | 13 | 17 | 17 | 5.4 | 4.3 | 6.5 | 4.5 |
| 25 | e3.0 | 22 | 10 | e12 | 19 | 13 | 131 | 320 | 5.3 | 7.3 | 10 | 4.2 |
| 26 | e3.1 | 11 | 7.0 | e13 | 17 | 52 | 40 | 1370 | 5.0 | 5.0 | 1660 | 4.0 |
| 27 | e3.1 | 10 | 6.1 | e11 | 16 | 665 | 24 | 1740 | 4.9 | 4.7 | 1320 | 4.2 |
| 28 | e3.4 | 10 | 5.3 | e10 | 14 | 217 | 18 | 962 | 4.9 | 4.6 | 282 | 4.1 |
| 29 | e3.2 | 8.4 | 67 | e9.0 | 14 | 340 | 14 | 124 | 4.8 | 4.3 | 512 | 4.2 |
| 30 | e3.1 | 7.5 | 51 | e8.5 | --- | 107 | 13 | 147 | 4.7 | 16 | 74 | 4.3 |
| 31 | e3.5 | --- | 18 | e8.0 | --- | 66 | --- | 646 | --- | 11 | 34 | --- |
| TOTAL | 108.1 | 534.3 | 322.5 | 1480.5 | 741.5 | 4423 | 649.2 | 6078.2 | 384.9 | 386.4 | 3989.8 | 205.0 |
| MEAN | 3.49 | 17.8 | 10.4 | 47.8 | 25.6 | 143 | 21.6 | 196 | 12.8 | 12.5 | 129 | 6.83 |
| MAX | 6.9 | 180 | 67 | 372 | 75 | 1480 | 131 | 1740 | 89 | 84 | 1660 | 20 |
| MIN | 2.8 | 2.9 | 4.8 | 8.0 | 7.5 | 13 | 9.1 | 8.4 | 4.7 | 4.3 | 3.0 | 4.0 |
| CFSM | 0.05 | 0.23 | 0.14 | 0.62 | 0.33 | 1.86 | 0.28 | 2.55 | 0.17 | 0.16 | 1.67 | 0.09 |
| IN. | 0.05 | 0.26 | 0.16 | 0.72 | 0.36 | 2.14 | 0.31 | 2.94 | 0.19 | 0.19 | 1.93 | 0.10 |
| e Estimated |
| STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1986 - 2004, BY WATER YEAR (WY) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | 10.1 | 79.2 | 58.3 | 102 | 128 | 140 | 163 | 150 | 53.5 | 23.0 | 14.2 | 15.0 |
| MAX | 62.6 | 542 | 233 | 327 | 383 | 456 | 540 | 809 | 279 | 101 | 129 | 155 |
| (WY) | 2002 | 1994 | 1991 | 1993 | 1986 | 1989 | 1996 | 1995 | 2000 | 1993 | 2004 | 1993 |
| MIN | 2.86 | 3.16 | 4.51 | 4.75 | 10.4 | 24.1 | 21.6 | 4.46 | 2.98 | 2.71 | 1.65 | 2.06 |
| (WY) | 1996 | 2000 | 1990 | 2000 | 1996 | 2001 | 2004 | 1988 | 1991 | 1991 | 1990 | 1995 |
| SUMMARY STATISTICS | FOR 2003 CALENDAR YEAR | FOR 2004 WATER YEAR | WATER YEARS 1986 - 2004 | |||
|---|---|---|---|---|---|---|
| ANNUAL TOTAL | 24246.9 | 19303.4 | ||||
| ANNUAL MEAN | 66.4 | 52.7 | 77.7 | |||
| HIGHEST ANNUAL MEAN | 123 | 1994 | ||||
| LOWEST ANNUAL MEAN | 21.3 | 1987 | ||||
| HIGHEST DAILY MEAN | 2640 | May 5 | 1740 | May 27 | 9940 | May 18 1995 |
| LOWEST DAILY MEAN | 2.2 | Aug 17 | 2.8 A | Oct 5 | 0.15 | Sep 29 1989 |
| ANNUAL SEVEN-DAY MINIMUM | 2.4 | Aug 13 | 3.0 B | Oct 20 | 0.38 | Dec 11 1989 |
| MAXIMUM PEAK FLOW | 2240 | Aug 27 | 16100 | May 17 1990 | ||
| MAXIMUM PEAK STAGE | 12.39 | Aug 27 | 17.03 | May 17 1990 | ||
| INSTANTANEOUS LOW FLOW | 1.9 | Oct 11 | ||||
| ANNUAL RUNOFF (CFSM) | 0.864 | 0.686 | 1.01 | |||
| ANNUAL RUNOFF (INCHES) | 11.73 | 9.34 | 13.72 | |||
| 10 PERCENT EXCEEDS | 110 | 55 | 114 | |||
| 50 PERCENT EXCEEDS | 7.2 | 10 | 11 | |||
| 90 PERCENT EXCEEDS | 3.0 | 3.4 | 2.9 | |||
A - But may have been less during periods of estimated discharges in October and November. | |