LOCATION.-- Lat 41°23'04", long 88°47'21" (NAD of 1927), in SW1/4SE1/4 sec.29, T.34 N., R.4 E., La Salle County, Hydrologic Unit 07120007, on left bank under County Highway 18 bridge in Dayton, and at mile 5.2. |
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DRAINAGE AREA.-- 2,642 mi2. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: November 1914 to current year. Prior to April 1925, published as "at Wedron." Monthly discharge only for some periods, published in WSP 1308. |
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STAGE: Water years 1994-2002. |
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SURFACE-WATER QUALITY |
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CHEMICAL: Water years 1978-92 and 1996. |
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REVISED RECORDS.-- WSP 730: 1931. WSP 1208: 1930, 1935, 1939. WSP 1308: 1916(M), 1922(M), 1926-31(M), 1934-40(M), 1946-47(M). WDR IL-75-1: Drainage area. WDR IL-76-1: 1969. |
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GAGE.-- Water-stage recorder, phone telemeter, U.S. Army Corps of Engineers satellite telemeter, and crest-stage gage. Datum of gage is 462.30 ft above NGVD of 1929. Prior to Apr. 13, 1925, nonrecording gage at site 4.1 mi upstream at datum 496.80 ft above Memphis datum. Apr. 13, 1925, to Sept. 30, 1942, nonrecording gage at site 1,000 ft upstream at datum 7.70 ft below NGVD of 1929. Oct. 1, 1942, to Apr. 10, 1951, nonrecording gage, and Apr. 11, 1951, to Sept. 30, 1978, water-stage recorder, at site 1.000 ft upstream at same datum. Oct. 1, 1978 to June 11, 1997, water-stage recorder at site 500 ft upstream at same datum. |
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REMARKS.-- Regulation by powerplant upstream from gage. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 55,400 ft3/s, July 19, 1996, gage height, 24.47 ft, from rating curve extended above 43,000 ft3/s; affected by dam failure 500 ft upstream from gage then in use. Maximum gage height, 36.47 ft, Jan. 25, 1960, ice jam; minimum daily discharge, 1.0 ft3/s, Aug. 29, 1934, when turbines were shut down; minimum daily with plant operating, 78 ft3/s, Oct. 29, 1956. |
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REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor. |
DISCHARGE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 1620 | 3500 | 2460 | e1300 | 1360 | 2390 | 1370 | 2770 | 1940 | 1060 | 482 | 823 |
2 | 1540 | 3100 | 2250 | e1400 | 1200 | e2200 | 1470 | 2800 | 1880 | 1030 | 410 | 670 |
3 | 1230 | 2700 | 2160 | e1400 | e1150 | e1800 | 1640 | 2980 | 1820 | 970 | 394 | 667 |
4 | 971 | 2470 | 2100 | e1320 | e1070 | e1500 | 1620 | 2670 | 3470 | 872 | 468 | 932 |
5 | 1370 | 2310 | 2050 | e1260 | e1130 | e1700 | 1700 | 2450 | 14700 | 912 | 606 | 855 |
6 | 1600 | 2260 | 1970 | e1220 | e1100 | e2100 | 1670 | 2340 | 12200 | 836 | 827 | 804 |
7 | 1210 | 2120 | 1890 | e1200 | e1220 | 2130 | 1810 | 2250 | 8380 | 795 | 600 | 787 |
8 | 1050 | 1940 | 1810 | e1190 | 1220 | 3230 | 2530 | 2180 | 6760 | 767 | 520 | 753 |
9 | 964 | 1830 | 1520 | e1180 | 1160 | 6060 | 5530 | 2240 | 5930 | 1140 | 448 | 732 |
10 | 901 | 1760 | 1680 | e1190 | 1430 | 5910 | 5700 | 1880 | 5360 | 1860 | 414 | 717 |
11 | 904 | 1730 | 1620 | e1220 | 1810 | 4390 | 5050 | 2380 | 4950 | 1180 | 377 | 656 |
12 | 1140 | 1710 | 1450 | 1230 | 1840 | 3940 | 4670 | 11700 | 4690 | 969 | 351 | 632 |
13 | 2470 | 1650 | 1750 | 1270 | 1910 | 3820 | 4430 | 10100 | 4150 | 807 | 379 | 620 |
14 | 7580 | 1720 | 2240 | 1190 | 2000 | 3680 | 4300 | 6910 | 3740 | 755 | 1530 | 552 |
15 | 6180 | 1760 | 2080 | 1180 | 1900 | 3570 | 4130 | 5350 | 3220 | 711 | 1990 | 548 |
16 | 4800 | 1700 | 1980 | 1150 | 1910 | 3320 | 3920 | 4540 | 2810 | 676 | 1310 | 522 |
17 | 3930 | 1760 | 2010 | 1160 | 1920 | 3170 | 3690 | 5270 | 2570 | 648 | 1060 | 529 |
18 | 3370 | 1750 | 2010 | 1150 | 1900 | 3060 | 3530 | 4930 | 2440 | 608 | 932 | 529 |
19 | 2940 | 1770 | 1950 | 1140 | 1890 | 2890 | 3190 | 4380 | 2290 | 565 | 916 | 557 |
20 | 2630 | 1760 | 1970 | e1160 | 3070 | 2770 | 3360 | 3970 | 2080 | 551 | 915 | 578 |
21 | 2370 | 1700 | 1880 | e1180 | 4160 | 2460 | 3340 | 3620 | 1940 | 614 | 989 | 730 |
22 | 2190 | 1680 | 1850 | e1200 | 3900 | 2110 | 3320 | 3080 | 1830 | 522 | 1170 | 731 |
23 | 3140 | 1660 | 1870 | e1200 | 3470 | 1930 | 3130 | 2630 | 1720 | 362 | 5060 | 997 |
24 | 5370 | 1750 | 1810 | 1220 | 3160 | 2130 | 2710 | 2310 | 1640 | 409 | 3750 | 914 |
25 | 5940 | 2240 | e1600 | 1310 | 2920 | 2210 | 2630 | 2160 | 1610 | 397 | 3000 | 844 |
26 | 5860 | 2200 | e1300 | 1120 | 2800 | 2200 | 2260 | 2010 | 1470 | 396 | 2490 | 744 |
27 | 5350 | 2130 | e1280 | 1100 | 2680 | 1940 | 2160 | 1890 | 1690 | 459 | 2120 | 607 |
28 | 4960 | 2040 | e1400 | 1100 | 2500 | 1660 | 3310 | 1820 | 1330 | 489 | 1620 | 574 |
29 | 4610 | 2100 | e1350 | 1130 | --- | 1560 | 3270 | 1830 | 1200 | 529 | 1300 | 567 |
30 | 4310 | 2230 | e1230 | 1170 | --- | 1690 | 2870 | 1850 | 1120 | 519 | 1090 | 560 |
31 | 3870 | --- | e1240 | 1250 | --- | 1520 | --- | 1940 | --- | 513 | 963 | --- |
TOTAL | 96370 | 61030 | 55760 | 37490 | 57780 | 85040 | 94310 | 109230 | 110930 | 22921 | 38481 | 20731 |
MEAN | 3109 | 2034 | 1799 | 1209 | 2064 | 2743 | 3144 | 3524 | 3698 | 739.4 | 1241 | 691.0 |
MAX | 7580 | 3500 | 2460 | 1400 | 4160 | 6060 | 5700 | 11700 | 14700 | 1860 | 5060 | 997 |
MIN | 901 | 1650 | 1230 | 1100 | 1070 | 1500 | 1370 | 1820 | 1120 | 362 | 351 | 522 |
CFSM | 1.18 | 0.77 | 0.68 | 0.46 | 0.78 | 1.04 | 1.19 | 1.33 | 1.40 | 0.28 | 0.47 | 0.26 |
IN. | 1.36 | 0.86 | 0.79 | 0.53 | 0.81 | 1.20 | 1.33 | 1.54 | 1.56 | 0.32 | 0.54 | 0.29 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1915 - 2002, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 1147 | 1486 | 1486 | 1474 | 2078 | 3276 | 3284 | 2449 | 1970 | 1267 | 937.0 | 979.3 |
MAX | 5239 | 5444 | 7695 | 4941 | 5649 | 11290 | 9157 | 7575 | 6189 | 5988 | 4909 | 5141 |
(WY) | 1955 | 1986 | 1983 | 1960 | 2001 | 1979 | 1979 | 1974 | 1996 | 1996 | 1924 | 1972 |
MIN | 141 | 329 | 364 | 335 | 338 | 412 | 418 | 217 | 267 | 174 | 153 | 186 |
(WY) | 1957 | 1954 | 1940 | 1940 | 1934 | 1934 | 1934 | 1934 | 1934 | 1934 | 1934 | 1946 |
SUMMARY STATISTICS | FOR 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1915 - 2002 | |||
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ANNUAL TOTAL | 921228 | 790073 | ||||
ANNUAL MEAN | 2524 | 2165 | 1818 | |||
HIGHEST ANNUAL MEAN | 3940 | 1993 | ||||
LOWEST ANNUAL MEAN | 330 | 1934 | ||||
HIGHEST DAILY MEAN | 11800 | Feb 10 | 14700 | Jun 5 | 46600 | Jul 19 1996 |
LOWEST DAILY MEAN | 468 | Aug 10,14 | 351 | Aug 12 | 1.0 A | Aug 29 1934 |
ANNUAL SEVEN-DAY MINIMUM | 526 | Aug 14 | 433 | Jul 22 | 120 | Oct 8 1956 |
MAXIMUM PEAK FLOW | 16900 | Jun 5 | 55400 B | Jul 19 1996 | ||
MAXIMUM PEAK STAGE | 14.65 | Jun 5 | 36.47 C | Jan 25 1960 | ||
INSTANTANEOUS LOW FLOW | 48 D | |||||
ANNUAL RUNOFF (CFSM) | 0.96 | 0.82 | 0.69 | |||
ANNUAL RUNOFF (INCHES) | 12.97 | 11.12 | 9.35 | |||
10 PERCENT EXCEEDS | 4610 | 4220 | 4110 | |||
50 PERCENT EXCEEDS | 2130 | 1760 | 1190 | |||
90 PERCENT EXCEEDS | 764 | 612 | 378 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |