Station list     Available data
ILLINOIS RIVER BASIN


05536995       CHICAGO SANITARY AND SHIP CANAL AT ROMEOVILLE, IL



LOCATION.-- Lat 41°38'27", long 88°03'35", in SE1/4SW1/4 sec.35, T.37 N., R.10 E., Will County, Hydrologic Unit 07120004, on left bank 40 ft upstream from bridge on Romeoville Road in Romeoville, 5.2 mi upstream from Lockport Lock and Dam, and at mile 6.2.

DRAINAGE AREA.-- 739 mi2.

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
 

DISCHARGE: October 1984 to current year.
 

STAGE: Water years 1994-2000.
SURFACE-WATER QUALITY
 

CHEMICAL: Water years 1987-92 and 1999-2000.
 

WATER TEMPERATURE: Water years 1974-77.

REVISED RECORDS.-- WDR IL-86-2: 1985. WDR IL-89-2: 1986. WDR IL-92-2: 1986-89.

GAGE.-- Acoustical flowmeter and phone telemeter. Datum of gage is 551.89 ft above sea level (U.S. Army Corps of Engineers bench mark).

REMARKS.-- Estimated daily discharges determined from a regression relation between present site and the previous site 5.2 mi downstream.

This gaging station provides flow data essential to determine Illinois' diversion of Lake Michigan water. A U.S. Supreme Court Decree limits Illinois' diversion to an average of 3,200 ft3/s. Illinois' diversion includes water diverted from the lake for domestic water supply, for navigation and water-quality improvement in the Chicago Sanitary and Ship Canal system, and the stormwater runoff from a 673 mi2 diverted watershed area. Flows recorded at this station also include nondiversion flows.

EXTREMES FOR PERIOD RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 19,466 ft3/s, Feb. 21, 1997, gage-height, 23.95 ft; maximum gage-height, 26.43 ft, Feb. 4, 1996; minimum discharge, no flow or periods of reverse flow at times in most years.

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are fair.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 e3021  1655  1567  1725  1645  1775  1728  2222  4331  2696  3193  2850 
2 e2537  1523  1473  1247  1660  e1239  1569  2285  3756  2746  3128  3122 
3 3270  1465  1798  1412  1385  1939  1149  2219  e3590  6896  3017  2789 
4 3376  1318  2502  1905  1749  1788  1394  1671  2760  4636  2956  3180 
5 2643  1407  7096  1723  1649  1854  1926  2043  4313  3491  3185  2946 
 
6 2832  1596  3591  1975  1622  1736  1597  2143  3676  3172  3932  2848 
7 2658  1342  2493  1170  1346  1628  1987  2039  2820  2987  3676  2714 
8 1965  1622  2448  1497  1452  1756  3005  2111  2683  3031  2841  2742 
9 2090  1418  2238  1860  1639  1727  2187  6392  2556  2469  e2505  2751 
10 2026  1581  1975  2086  1702  1552  1836  3276  2587  6636  3019  2836 
 
11 1948  1575  1873  2064  e2201  1436  2004  e3599  3002  4613  3110  7069 
12 2156  1335  1564  1255  1940  e1098  1860  3330  4513  4221  2620  11340 
13 2074  1443  1881  1835  1525  1769  2019  3508  5692  3863  2651  4740 
14 1967  1471  1636  1346  1577  1706  1838  3160  6142  3077  2486  4908 
15 1996  1662  2404  1771  1632  e1449  1501  3522  4909  3191  2677  4140 
 
16 e1638  1345  1910  1503  1240  2083  2176  2417  3933  2730  e2026  3709 
17 2032  1413  1614  1501  1802  1238  4653  2728  3286  2812  e4407  3132 
18 1825  e1025  1686  1750  1884  2128  3420  2353  3010  2739  3931  2863 
19 1589  e1303  1645  1558  1728  2029  4141  3151  2398  2939  3275  3221 
20 e1260  1271  1620  1477  2004  2778  11563  3082  3802  2611  2981  3122 
 
21 e1099  1582  e1162  1697  2065  1901  10619  e2667  4987  2673  2610  2963 
22 1388  1658  e941  1342  2873  1811  e7457  2527  4230  2707  2608  4581 
23 1446  2443  e1650  1499  3341  1749  e5679  2417  e2495  2677  2913  4542 
24 1702  1712  e1413  1684  3823  2126  3435  2082  e4718  2742  2652  4843 
25 1655  1781  e1333  e1352  4146  1408  3451  2040  5725  2511  2660  3777 
 
26 1389  1753  1599  1495  3271  1693  3444  1997  5485  2666  e1950  2924 
27 1726  1132  e1113  1757  2656  1964  3027  2322  e4480  2649  2597  2681 
28 997  1421  e1380  1638  2366  1271  2143  4816  3327  2964  2762  3000 
29 2143  1662  1749  e1348  2088  1638  2017  3349  3116  3135  2578  2593 
30 1859  1418  1573  1831  ---  1647  2006  3032  2909  3734  2682  2235 
 
31 2252  ---  1567  1663  ---  1823  ---  4338  ---  3282  2806  --- 

TOTAL 62559 45332 60494 49966 60011 53739 96831 88838 115231 103296 90434 111161
MEAN 2018 1511 1951 1612 2069 1734 3228 2866 3841 3332 2917 3705
MAX 3376 2443 7096 2086 4146 2778 11563 6392 6142 6896 4407 11340
MIN 997 1025 941 1170 1240 1098 1149 1671 2398 2469 1950 2235

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1985 - 2000, BY WATER YEAR (WY)
MEAN 3223 3070 2719 2881 2954 3231 3584 3566 4030 4152 4344 4077
MAX 5244 5244 3991 4347 4975 4791 5194 5491 6405 5426 6830 5181
(WY) 1987 1986 1988 1993 1997 1985 1992 1990 1993 1986 1987 1986
MIN 2018 1511 1904 1612 2069 1734 2534 2370 3288 3223 2917 2681
(WY) 2000 2000 1999 2000 2000 2000 1997 1994 1995 1999 2000 1999

SUMMARY STATISTICS FOR 1999 CALENDAR YEAR FOR 2000 WATER YEAR WATER YEARS 1985 - 2000
ANNUAL TOTAL 1036659      937892         
ANNUAL MEAN 2840      2563          3488         
HIGHEST ANNUAL MEAN 4113          1986
LOWEST ANNUAL MEAN 2563          2000
HIGHEST DAILY MEAN 11680  A     Jun 13 11563              Apr 20 17870          May 10 1990
LOWEST DAILY MEAN 941  A     Dec 22 941      A     Dec 22 941      A Dec 22 1999
ANNUAL SEVEN-DAY MINIMUM 1320          Dec 21 1320              Dec 21 1320          Dec 21 1999
INSTANTANEOUS PEAK FLOW 15232      B     Sep 12 19466      C Feb 21 1997
INSTANTANEOUS PEAK STAGE 26.32 D     May 13 26.43 E Feb 4 1996
INSTANTANEOUS LOW FLOW -5148              Oct 28 F
10 PERCENT EXCEEDS 4210      4140          5190         
50 PERCENT EXCEEDS 2540      2150          3110         
90 PERCENT EXCEEDS 1570      1410          2090         
A - Estimated by regression.
B - Gage height, 22.14 ft.
 C - Gage height, 23.95 ft.
 D - Discharge, 1,300 ft3/s.
 E - Discharge, 2,876 ft3/s.
 F - No flow or periods of reverse flow at times in most years.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data