LOCATION.-- Lat 42°18'10", long 89°37'10" (NAD of 1927), in SE1/4 sec.30, T.27 N., R.8 E., Stephenson County, Hydrologic Unit 07090003, on right bank on property of Commonwealth Edison Company in Freeport, 0.3 mi upstream from Stephenson Street Bridge, 5 mi upstream from Yellow Creek, and at mile 61.9. |
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DRAINAGE AREA.-- 1,326 mi2. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: September 1914 to current year. |
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STAGE: Water years 1994-2002. |
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SURFACE-WATER QUALITY |
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CHEMICAL: Water years 1978-91. |
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REVISED RECORDS.-- WSP 1175: 1944, 1948. WSP 1508: 1915(M), 1917(M), 1921(M), 1924(M), 1928(M), 1930(M), 1935-37. WDR IL-75-1: Drainage area. |
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GAGE.-- Water-stage recorder, and U.S. Army Corps of Engineers satellite telemeter and rain gage. Datum of gage is 743.18 ft above NGVD of 1929. Prior to Jan. 15, 1935, nonrecording gage at site 0.9 mi downstream at datum 4.2 ft lower. July 13, 1943, to Aug. 25, 1982, auxiliary nonrecording gage read once daily 0.9 mi down stream. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 18,400 ft3/s, Mar. 16, 1929, gage height, 19.76 ft, site and datum then in use; minimum, 82 ft3/s, Dec. 11, 1957, result of freezeup. |
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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 | 993 | 1070 | 1050 | e890 | 700 | 927 | 913 | 1280 | 932 | 1070 | 778 | 737 |
2 | 940 | 1030 | 1040 | e880 | 674 | 893 | 905 | 1250 | 895 | 1030 | 742 | 786 |
3 | 901 | 998 | 1030 | e880 | 637 | 850 | 908 | 1210 | 899 | 1000 | 713 | 1050 |
4 | 866 | 962 | 997 | e860 | 633 | 762 | 908 | 1190 | 2920 | 978 | 694 | 1110 |
5 | 849 | 925 | 974 | 873 | 658 | 850 | 896 | 1160 | 4600 | 950 | 693 | 1060 |
6 | 839 | 896 | 968 | 856 | 685 | 955 | 875 | 1110 | 4850 | 931 | 726 | 887 |
7 | 824 | 880 | 973 | 850 | 772 | 993 | 889 | 1090 | 4500 | 939 | 751 | 786 |
8 | 803 | 872 | 1000 | 837 | 808 | 1040 | 1100 | 1060 | 4250 | 983 | 725 | 743 |
9 | 789 | 857 | 1010 | 829 | 787 | 1470 | 1880 | 1060 | 4160 | 1030 | 691 | 720 |
10 | 833 | 846 | 973 | 818 | 813 | 1820 | 2280 | 1030 | 3990 | 997 | 669 | 708 |
11 | 953 | 833 | 937 | 817 | 1000 | 1870 | 2240 | 1040 | 3580 | 947 | 656 | 702 |
12 | 962 | 821 | 918 | 820 | 1070 | 1800 | 2040 | 1110 | 3140 | 909 | 651 | 692 |
13 | 934 | 835 | 958 | 832 | 1010 | 1630 | 1830 | 1170 | 2740 | 884 | 694 | 685 |
14 | 914 | 913 | 1040 | 823 | 862 | 1490 | 1680 | 1250 | 2420 | 864 | 732 | 681 |
15 | 882 | 936 | 1110 | 828 | 796 | 1390 | 1570 | 1250 | 2180 | 846 | 730 | 672 |
16 | 864 | 920 | 1120 | 824 | 769 | 1310 | 1480 | 1180 | 1980 | 830 | 723 | 661 |
17 | 845 | 892 | 1090 | 817 | 756 | 1230 | 1400 | 1130 | 1820 | 818 | 689 | 657 |
18 | 822 | 863 | 1060 | 701 | 743 | 1170 | 1330 | 1080 | 1680 | 805 | 654 | 653 |
19 | 808 | 846 | 1030 | 666 | 756 | 1120 | 1310 | 1030 | 1570 | 796 | 641 | 655 |
20 | 796 | 832 | 995 | 686 | 963 | 1100 | 1280 | 1000 | 1490 | 786 | 633 | 751 |
21 | 786 | 829 | 965 | 780 | 1490 | 1100 | 1310 | 977 | 1420 | 777 | 650 | 787 |
22 | 796 | 828 | 932 | 832 | 1620 | 1090 | 1320 | 959 | 1370 | 775 | 3690 | 770 |
23 | 1220 | 817 | 941 | 818 | 1510 | 1070 | 1280 | 948 | 1320 | 776 | 5330 | 732 |
24 | 1710 | 846 | 961 | 799 | 1300 | 1030 | 1270 | 940 | 1270 | 782 | 4400 | 691 |
25 | 2110 | 1130 | 894 | 795 | 1170 | 1010 | 1250 | 947 | 1230 | 831 | 3390 | 663 |
26 | 2050 | 1340 | 836 | 790 | 1100 | 987 | 1220 | 978 | 1200 | 804 | 2390 | 649 |
27 | 1750 | 1330 | 825 | 799 | 1050 | 955 | 1210 | 997 | 1180 | 772 | 1590 | 646 |
28 | 1480 | 1230 | e900 | 752 | 983 | 935 | 1220 | 1010 | 1170 | 769 | 1080 | 643 |
29 | 1290 | 1140 | e890 | 716 | --- | 937 | 1230 | 979 | 1160 | 782 | 868 | 658 |
30 | 1180 | 1080 | e890 | 702 | --- | 935 | 1260 | 953 | 1120 | 793 | 790 | 735 |
31 | 1110 | --- | e890 | 695 | --- | 925 | --- | 953 | --- | 806 | 755 | --- |
TOTAL | 32899 | 28597 | 30197 | 24865 | 26115 | 35644 | 40284 | 33321 | 67036 | 27060 | 38918 | 22370 |
MEAN | 1061 | 953.2 | 974.1 | 802.1 | 932.7 | 1150 | 1343 | 1075 | 2235 | 872.9 | 1255 | 745.7 |
MAX | 2110 | 1340 | 1120 | 890 | 1620 | 1870 | 2280 | 1280 | 4850 | 1070 | 5330 | 1110 |
MIN | 786 | 817 | 825 | 666 | 633 | 762 | 875 | 940 | 895 | 769 | 633 | 643 |
CFSM | 0.80 | 0.72 | 0.73 | 0.60 | 0.70 | 0.87 | 1.01 | 0.81 | 1.69 | 0.66 | 0.95 | 0.56 |
IN. | 0.92 | 0.80 | 0.85 | 0.70 | 0.73 | 1.00 | 1.13 | 0.93 | 1.88 | 0.76 | 1.09 | 0.63 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1914 - 2002, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 697.8 | 749.1 | 685.6 | 754.7 | 1125 | 1752 | 1224 | 1010 | 1044 | 910.0 | 719.9 | 757.6 |
MAX | 2654 | 2773 | 1807 | 2817 | 3992 | 4915 | 3539 | 3931 | 3742 | 6423 | 2279 | 3011 |
(WY) | 1928 | 1962 | 1983 | 1973 | 1938 | 1929 | 1993 | 1973 | 2000 | 1993 | 1993 | 1938 |
MIN | 228 | 258 | 201 | 163 | 282 | 356 | 396 | 232 | 266 | 211 | 233 | 218 |
(WY) | 1965 | 1965 | 1959 | 1959 | 1964 | 1957 | 1957 | 1934 | 1934 | 1936 | 1934 | 1958 |
SUMMARY STATISTICS | FOR 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1914 - 2002 | |||
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ANNUAL TOTAL | 445669 | 407306 | ||||
ANNUAL MEAN | 1221 | 1116 | 951.4 | |||
HIGHEST ANNUAL MEAN | 2452 | 1993 | ||||
LOWEST ANNUAL MEAN | 373 | 1964 | ||||
HIGHEST DAILY MEAN | 2650 | Feb 11 | 5330 | Aug 23 | 17000 | Mar 28 1916 |
LOWEST DAILY MEAN | 490 A | Jan 1,2,3 | 633 | Feb 4,Aug 20 | 118 | Aug 4 1936 |
ANNUAL SEVEN-DAY MINIMUM | 503 | Jan 1 | 666 | Sep 13 | 150 | Dec 18 1964 |
MAXIMUM PEAK FLOW | 5560 | Aug 23 | 18400 | Mar 16 1929 | ||
MAXIMUM PEAK STAGE | 13.97 | Aug 23 | 19.76 B | Mar 16 1929 | ||
INSTANTANEOUS LOW FLOW | 606 | Feb 3 | 82 C | Dec 11 1957 | ||
ANNUAL RUNOFF (CFSM) | 0.92 | 0.84 | 0.72 | |||
ANNUAL RUNOFF (INCHES) | 12.50 | 11.43 | 9.75 | |||
10 PERCENT EXCEEDS | 1970 | 1580 | 1780 | |||
50 PERCENT EXCEEDS | 1050 | 935 | 670 | |||
90 PERCENT EXCEEDS | 600 | 702 | 316 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |