LOCATION.-- Lat 41°12'30", long 88°55'51" (NAD of 1927), in SW1/4SW1/4 sec.30, T.32 N., R.3 E., La Salle County, Hydrologic Unit 07130002, on left downstream side of bridge on County Highway 57 (Red, White and Blue Bridge Road), 3 mi northeast of Leonore, 6.2 mi downstream from Otter Creek, 8 mi northwest of Streator, and at mile 17.2. |
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DRAINAGE AREA.-- 1,251 mi2. Area at site used prior to October 1971, 1,278 mi2. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: May 1931 to current year. Prior to October 1971, published as "at Lowell." |
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STAGE: Water years 1994 to current year. |
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SURFACE-WATER QUALITY |
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CHEMICAL: Water years 1978 to 1991. |
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SEDIMENT: June 1980 to September 1981. |
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MISCELLANEOUS: Contaminants in streambed sediments, July 1996; contaminants in fish tissue, July 1996. |
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REVISED RECORDS.-- WSP 745: 1931-32. WSP 1308: 1932(M), 1935-38(M), 1940(M), 1942(M). WDR IL-75-1: Drainage area. |
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GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter and crest-stage gage. Datum of gage is 520.58 ft above NGVD of 1929. Prior to Aug. 20, 1952, nonrecording gage at site 6.8 mi downstream at datum 19.97 ft lower. Aug. 20, 1952 to Sept. 30, 1971, nonrecording gage at site 6.7 mi downstream at datum 19.97 ft lower. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 33,500 ft3/s, July 15, 1958, gage height, 15.30 ft, from graph based on gage readings, site and datum then in use; maximum gage height, 27.13 ft, Dec. 4, 1982, present site and datum (discharge 31,800 ft3/s); minimum discharge, 2.6 ft3/s, Aug. 3, 1988. |
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SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 6,730 mg/L Aug. 15, 1981; minimum daily mean, 1 mg/L Feb. 5, 1981. |
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SUSPENDED-SEDIMENT LOADS: Maximum daily, 209,000 tons Aug. 15, 1981; minimum daily, 0.24 ton Feb. 5, 1981. |
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REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor. |
Discharge, cubic feet per second, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 15 | 47 | 596 | 355 | e180 | 279 | 3750 | 1130 | 8610 | 252 | 56 | 351 |
2 | 15 | 57 | 514 | 337 | e175 | 285 | 3110 | 1420 | 5140 | 235 | 51 | 246 |
3 | 15 | 52 | 443 | 332 | e180 | 290 | 2390 | 1330 | 3450 | 218 | 53 | 176 |
4 | 16 | 49 | 413 | 345 | e180 | 302 | 1870 | 1190 | 2510 | 219 | 219 | 135 |
5 | 15 | 90 | 419 | 347 | e175 | 1100 | 1490 | 1060 | 1960 | 210 | 237 | 108 |
6 | 15 | 72 | 415 | 472 | e170 | 3400 | 1240 | 930 | 1610 | 212 | 124 | 92 |
7 | 15 | 73 | 402 | 437 | e175 | 2880 | 1100 | 872 | 1340 | 215 | 76 | 77 |
8 | 13 | 71 | 397 | 411 | e180 | 1990 | 995 | 1040 | 1130 | 193 | 65 | 64 |
9 | 12 | 84 | 490 | 428 | e170 | 1470 | 874 | 983 | 957 | 188 | 55 | 54 |
10 | 12 | 75 | 776 | 340 | e165 | 1120 | 756 | 870 | 878 | 200 | 43 | 49 |
11 | 11 | 68 | 1190 | 312 | e160 | 908 | 670 | 759 | 961 | 403 | 34 | 44 |
12 | 10 | 63 | 1300 | 298 | e155 | 755 | 617 | 1090 | 1840 | 814 | 29 | 41 |
13 | 9.1 | 54 | 958 | 292 | e150 | 670 | 574 | 1270 | 2350 | 611 | 29 | 36 |
14 | e16 | 47 | 775 | 289 | e145 | 595 | 548 | 1510 | 1890 | 534 | 26 | 32 |
15 | 24 | 44 | 671 | 258 | e140 | 536 | 519 | 2590 | 1590 | 524 | 24 | 31 |
16 | 15 | 45 | 605 | 281 | e135 | 511 | 485 | 3260 | 1240 | 443 | 21 | 63 |
17 | 12 | 45 | 541 | 318 | e135 | 489 | 463 | 2490 | 999 | 340 | 18 | 46 |
18 | 15 | 100 | 504 | 369 | e130 | 473 | 445 | 1890 | 840 | 268 | 22 | 46 |
19 | 15 | 1740 | 463 | 463 | e130 | 448 | 421 | 1590 | 748 | 239 | 32 | 43 |
20 | 17 | 4850 | 391 | 367 | e240 | 418 | 424 | 1710 | 650 | 223 | 39 | 54 |
21 | 18 | 3730 | 380 | 400 | e370 | 384 | 503 | 1480 | 596 | 193 | 126 | 61 |
22 | 20 | 2290 | 388 | 350 | e850 | 362 | 705 | 1260 | 585 | 168 | 107 | 54 |
23 | 20 | 1570 | 416 | 268 | e940 | 347 | 796 | 1170 | 545 | 135 | 83 | 44 |
24 | 20 | 1300 | 404 | e250 | e740 | 346 | 668 | 1060 | 479 | 118 | 83 | 38 |
25 | 25 | 1810 | 552 | e240 | e650 | 345 | 858 | 1190 | 423 | 104 | 83 | 33 |
26 | 25 | 1620 | 507 | e220 | 530 | 361 | 1780 | 1750 | 386 | 92 | 96 | 29 |
27 | 44 | 1210 | 443 | e220 | 385 | 644 | 1530 | 1920 | 353 | 82 | 239 | 27 |
28 | 37 | 955 | 403 | e210 | 327 | 1780 | 1190 | 1540 | 331 | 74 | 1420 | 26 |
29 | 40 | 785 | 394 | e200 | 293 | 2310 | 969 | 1190 | 302 | 68 | 1220 | 25 |
30 | 58 | 676 | 392 | e190 | --- | 3220 | 852 | 1850 | 279 | 66 | 693 | 23 |
31 | 52 | --- | 377 | e185 | --- | 3350 | --- | 8530 | --- | 62 | 463 | --- |
TOTAL | 646.1 | 23672 | 16919 | 9784 | 8355 | 32368 | 32592 | 51924 | 44972 | 7703 | 5866 | 2148 |
MEAN | 20.8 | 789 | 546 | 316 | 288 | 1044 | 1086 | 1675 | 1499 | 248 | 189 | 71.6 |
MAX | 58 | 4850 | 1300 | 472 | 940 | 3400 | 3750 | 8530 | 8610 | 814 | 1420 | 351 |
MIN | 9.1 | 44 | 377 | 185 | 130 | 279 | 421 | 759 | 279 | 62 | 18 | 23 |
CFSM | 0.02 | 0.63 | 0.44 | 0.25 | 0.23 | 0.83 | 0.87 | 1.34 | 1.20 | 0.20 | 0.15 | 0.06 |
IN. | 0.02 | 0.70 | 0.50 | 0.29 | 0.25 | 0.96 | 0.97 | 1.54 | 1.34 | 0.23 | 0.17 | 0.06 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1972 - 2004, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 436 | 707 | 948 | 848 | 1305 | 1968 | 1803 | 1648 | 1379 | 703 | 318 | 372 |
MAX | 3188 | 4978 | 6201 | 4259 | 4159 | 7649 | 5098 | 5152 | 4442 | 2966 | 2678 | 3997 |
(WY) | 1987 | 1986 | 1983 | 1993 | 2001 | 1979 | 1982 | 1995 | 1980 | 1993 | 1981 | 1993 |
MIN | 11.4 | 11.4 | 11.4 | 6.36 | 38.1 | 49.1 | 208 | 241 | 78.5 | 8.83 | 6.89 | 11.8 |
(WY) | 1972 | 1972 | 1977 | 1977 | 2003 | 2000 | 1977 | 1992 | 1988 | 1988 | 1988 | 1999 |
SUMMARY STATISTICS | FOR 2003 CALENDAR YEAR | FOR 2004 WATER YEAR | WATER YEARS 1972 - 2004 | |||
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ANNUAL TOTAL | 155018.5 | 236949.1 | ||||
ANNUAL MEAN | 425 | 647 | 1034 | |||
HIGHEST ANNUAL MEAN | 2419 | 1993 | ||||
LOWEST ANNUAL MEAN | 267 | 2000 | ||||
HIGHEST DAILY MEAN | 4850 | Nov 20 | 8610 | Jun 1 | 30000 | Dec 4 1982 |
LOWEST DAILY MEAN | 9.1 | Oct 13 | 9.1 | Oct 13 | 2.6 | Aug 3 1988 |
ANNUAL SEVEN-DAY MINIMUM | 11 | Aug 25 | 12 | Oct 7 | 3.0 | Jul 30 1988 |
MAXIMUM PEAK FLOW | 10800 | Jun 1 | 31800 | Dec 4 1982 | ||
MAXIMUM PEAK STAGE | 16.57 | Jun 1 | 27.13 | Dec 4 1982 | ||
INSTANTANEOUS LOW FLOW | 8.0 | Oct 13 | 2.6 | Aug 3 1988 | ||
ANNUAL RUNOFF (CFSM) | 0.339 | 0.518 | 0.826 | |||
ANNUAL RUNOFF (INCHES) | 4.61 | 7.05 | 11.23 | |||
10 PERCENT EXCEEDS | 1170 | 1600 | 2560 | |||
50 PERCENT EXCEEDS | 166 | 348 | 383 | |||
90 PERCENT EXCEEDS | 18 | 29 | 25 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |