LOCATION.-- Lat 41°31'20", long 88°11'33" (NAD of 1927), in SE1/4SW1/4 sec.10, T.35 N., R.9 E., Will County, Hydrologic Unit 07120004, on left bank 400 ft upstream from bridge on U.S. Highway 52 at Shorewood, 3.8 mi downstream from Lily Cache Creek and at mile 10.6. |
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DRAINAGE AREA.-- 324 mi2. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: October 1940 to current year. Published as "at Troy" 1940-65. |
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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 1978-91. |
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WATER TEMPERATURE: Water years 1964-76. |
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MISCELLANEOUS: Water years 1998 and 2002. |
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REVISED RECORDS.-- WSP 1035: 1944. WSP 1055: 1942(M). WDR IL-75-1: Drainage area. |
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GAGE.-- Water-stage recorder, phone telemeter, U.S. Army Corps of Engineers satellite telemeter, and masonry dam. Datum of gage is 564.62 ft above NGVD of 1929 (Illinois Department of Transportation bench mark). Prior to Apr. 11, 1941, nonrecording gage at same site and datum. |
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REMARKS.-- Streamflow contains effluent from sewage-treatment plants upstream. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 17,300 ft3/s, July 18, 1996, from rating curve extended above 14,000 ft3/s, gage height, 14.03 ft, from floodmark; minimum 0.2 ft3/s, Nov. 17, 1955, result of freezeup. |
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REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor. Effluent from sewage-treatment plant upstream averaged 33 ft3/s during the year. The maximum monthly average was 40 ft3/s in May, and the minumum was 30 ft3/s in October. |
Discharge, cubic feet per second, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 146 | 134 | 129 | 173 | e175 | 145 | 255 | 1290 | 416 | 138 | 531 | 208 |
2 | 155 | 129 | 133 | 166 | e190 | 146 | 227 | 2010 | 315 | 133 | 1150 | 369 |
3 | 222 | 130 | 130 | 175 | e220 | 145 | 208 | 1720 | 308 | 135 | 939 | 262 |
4 | 229 | 127 | 134 | 166 | 250 | 156 | 370 | 928 | 306 | 141 | 1230 | 204 |
5 | 433 | 131 | 130 | 169 | 189 | 148 | 1220 | 1470 | 259 | 224 | 837 | 180 |
6 | 311 | 132 | 117 | 176 | 195 | 153 | 959 | 1680 | 236 | 402 | 603 | 161 |
7 | 225 | 129 | 127 | 183 | 159 | 154 | 614 | 1040 | 235 | 449 | 1010 | 149 |
8 | 192 | 124 | 122 | 173 | 114 | 156 | 535 | 696 | 240 | 439 | 792 | 144 |
9 | 160 | 123 | 122 | 171 | e150 | 159 | 458 | 1560 | 374 | 469 | 528 | 144 |
10 | 147 | 124 | e140 | 169 | e180 | 150 | 417 | 2020 | 344 | 419 | 385 | 147 |
11 | 136 | 128 | 154 | 113 | e170 | 179 | 392 | 1810 | 296 | 363 | 306 | 143 |
12 | 143 | 135 | 146 | 134 | e165 | 177 | 337 | 1320 | 245 | 276 | 272 | 138 |
13 | 131 | 129 | 149 | e170 | e160 | 330 | 301 | 901 | 224 | 218 | 247 | 139 |
14 | 129 | 123 | 142 | e165 | e157 | 316 | 269 | 682 | 208 | 190 | 230 | 151 |
15 | 145 | 135 | 143 | e160 | e154 | 265 | 244 | 621 | 189 | 441 | 213 | 264 |
16 | 133 | 139 | 144 | e152 | e152 | 257 | 232 | 594 | 181 | 710 | 204 | 231 |
17 | 127 | 134 | 149 | e150 | e150 | 265 | 222 | 467 | 178 | 460 | 195 | 186 |
18 | 127 | 141 | 210 | e148 | e151 | 252 | 217 | 397 | 175 | 1190 | 191 | 161 |
19 | 139 | 140 | 851 | e153 | e156 | 246 | 209 | 356 | 225 | 833 | 190 | 143 |
20 | 133 | 150 | 593 | e155 | e164 | 324 | 205 | 362 | 226 | 482 | 177 | 140 |
21 | 124 | 149 | 364 | e154 | 166 | 342 | 210 | 351 | 186 | 543 | 165 | 133 |
22 | 136 | 150 | 281 | e150 | 171 | 286 | 202 | 303 | 166 | 652 | 156 | 133 |
23 | 128 | 154 | 233 | e145 | 164 | 252 | 201 | 287 | 155 | 399 | 151 | 155 |
24 | 122 | 145 | 218 | e142 | 169 | 227 | 189 | 265 | 160 | 297 | 142 | 151 |
25 | 129 | 140 | 209 | e143 | 159 | 230 | 180 | 241 | 149 | 255 | 134 | 144 |
26 | 163 | 139 | 190 | e149 | 161 | 243 | 173 | 221 | 144 | 206 | 136 | 146 |
27 | 152 | 140 | 186 | e150 | 152 | 225 | 163 | 219 | 147 | 744 | 140 | 260 |
28 | 138 | 141 | 185 | e150 | 145 | 219 | 154 | 229 | 141 | 1350 | 137 | 243 |
29 | 145 | 135 | 172 | e150 | --- | 340 | 177 | 288 | 148 | 880 | 141 | 188 |
30 | 140 | 134 | 171 | e150 | --- | 337 | 237 | 272 | 137 | 565 | 139 | 166 |
31 | 129 | --- | 181 | e160 | --- | 275 | --- | 469 | --- | 398 | 133 | --- |
TOTAL | 5069 | 4064 | 6355 | 4864 | 4688 | 7099 | 9777 | 25069 | 6713 | 14401 | 11804 | 5383 |
MEAN | 164 | 135 | 205 | 157 | 167 | 229 | 326 | 809 | 224 | 465 | 381 | 179 |
MAX | 433 | 154 | 851 | 183 | 250 | 342 | 1220 | 2020 | 416 | 1350 | 1230 | 369 |
MIN | 122 | 123 | 117 | 113 | 114 | 145 | 154 | 219 | 137 | 133 | 133 | 133 |
CFSM | 0.50 | 0.42 | 0.63 | 0.48 | 0.52 | 0.71 | 1.01 | 2.50 | 0.69 | 1.43 | 1.18 | 0.55 |
IN. | 0.58 | 0.47 | 0.73 | 0.56 | 0.54 | 0.82 | 1.12 | 2.88 | 0.77 | 1.65 | 1.36 | 0.62 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1941 - 2003, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 201 | 223 | 242 | 251 | 326 | 469 | 517 | 428 | 325 | 236 | 197 | 183 |
MAX | 1474 | 788 | 1257 | 927 | 1267 | 1946 | 1418 | 1105 | 946 | 1337 | 1245 | 908 |
(WY) | 1955 | 1986 | 1983 | 1993 | 1997 | 1979 | 1983 | 1974 | 1996 | 1996 | 1987 | 1961 |
MIN | 26.2 | 27.4 | 22.7 | 30.8 | 28.4 | 71.2 | 102 | 99.5 | 68.6 | 45.8 | 31.2 | 26.8 |
(WY) | 1957 | 1957 | 1964 | 1954 | 1964 | 1945 | 1963 | 1958 | 1963 | 1956 | 1941 | 1946 |
SUMMARY STATISTICS | FOR 2002 CALENDAR YEAR | FOR 2003 WATER YEAR | WATER YEARS 1941 - 2003 | |||
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ANNUAL TOTAL | 141324 | 105286 | ||||
ANNUAL MEAN | 387 | 288 | 300 | |||
HIGHEST ANNUAL MEAN | 564 | 1993 | ||||
LOWEST ANNUAL MEAN | 94.2 | 1963 | ||||
HIGHEST DAILY MEAN | 3710 | May 12 | 2020 | May 10 | 11400 | Oct 11 1954 |
LOWEST DAILY MEAN | 117 A | Dec 6 | 113 A | Jan 11 | 14 | Dec 24 1963 |
ANNUAL SEVEN-DAY MINIMUM | 126 | Dec 3 | 126 | Dec 3 | 15 | Dec 27 1963 |
MAXIMUM PEAK FLOW | 2070 | May 2 | 17300 B | Jul 18 1996 | ||
MAXIMUM PEAK STAGE | 4.53 | May 2 | 14.03 C | Jul 18 1996 | ||
INSTANTANEOUS LOW FLOW | 56 A | Dec 6 | 0.20 A | Nov 17 1955 | ||
ANNUAL RUNOFF (CFSM) | 1.20 | 0.89 | 0.92 | |||
ANNUAL RUNOFF (INCHES) | 16.23 | 12.09 | 12.56 | |||
10 PERCENT EXCEEDS | 714 | 552 | 641 | |||
50 PERCENT EXCEEDS | 232 | 176 | 173 | |||
90 PERCENT EXCEEDS | 133 | 133 | 48 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |