Station list     Available data
ILLINOIS RIVER BASIN


05576000                         SOUTH FORK SANGAMON RIVER NEAR ROCHESTER, IL



LOCATION.--Lat 39°44'32", long 89°34'02", in NE1/4NW1/4 sec.20, T.15 N., R.4 W., Sangamon County, Hydrologic Unit 07130007, on right bank at city of Springfield dam, 100 ft downstream from Horse Creek, 1.7 mi southwest of Rochester, and at mile 7.4.

DRAINAGE AREA.--867 mi2.

PERIOD OF RECORD.--July 1949 to current year.

REVISED RECORDS.--WDR IL-75-1: Drainage area.

GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 511.30 ft above sea level. Prior to Oct. 1, 1964, water-stage recorder, and Oct. 1, 1964, to Apr. 12, 1966, non-recording gage, at site 1.8 mi downstream at same datum. Auxiliary water-stage recorder at site 1.2 mi downstream. Prior to May 19, 1950, auxiliary non-recording gage at site 6.2 mi downstream. May 19, 1950 to Apr. 29, 1975, auxiliary non-recording gage at site 1.2 mi downstream.

REMARKS.--Records fair except those for estimated daily discharges, which are poor. Beginning Apr. 14, 1955, diversion above station for Springfield municipal supply during some years. Occasional regulation caused by operation of gate at diversion dam. U.S. Army Corps of Engineers satellite telemeter at station.
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 3.7 9.8 93    3.5 155  492  3060  1120  829  e1650  137  46 
2 3.2 9.2 12    2.7 159  454  3010  e1410  689  1410  152  48 
3 3.0 8.9 35    1.8 151  466  2780  e1900  588  1280  120  46 
4 2.6 8.5 26    1.5 138  505  2840  2600  520  1070  104  41 
5 2.4 9.1 37    1.7 134  390  2830  2960  531  894  597  38 
 
6 2.1 7.9 2.9 3.7 123  333  2630  3280  589  692  1820  34 
7 1.9 4.5 2.7 20    109  314  2570  3720  569  716  916  32 
8 1.8 5.3 2.6 265    100  389  2630  4490  530  872  565  30 
9 1.9 4.7 2.7 679    99  930  2570  4540  935  1010  551  27 
10 1.6 25    2.6 748    97  1120  2260  4240  1390  1040  466  26 
 
11 1.6 8.0 2.6 711    148  1240  1880  3880  1490  1160  316  24 
12 1.9 5.5 2.7 656    239  1250  1640  3420  2550  1260  192  23 
13 3.0 6.2 2.3 656    222  1210  1460  2920  2840  1030  135  23 
14 3.0 5.6 2.5 582    211  1240  e1430  2300  2630  771  107  22 
15 3.1 4.9 2.4 491    209  1150  1360  1840  2670  558  92  22 
 
16 3.3 4.1 2.7 370    209  1040  1240  e1500  2580  410  541  21 
17 3.4 4.0 2.6 225    258  e1070  1190  e1350  3160  357  388  21 
18 3.4 4.3 2.4 136    473  1600  1120  912  3570  359  539  20 
19 3.2 4.4 2.5 77    616  1620  983  748  4700  349  819  21 
20 3.2 4.1 2.4 75    826  1900  893  650  4970  326  713  22 
 
21 3.3 5.4 2.5 87    873  2690  791  600  4910  308  600  23 
22 3.4 6.2 2.8 85    838  3040  679  630  4920  297  475  23 
23 3.5 6.6 1.9 58    753  3660  601  1670  5050  313  358  22 
24 3.7 7.1 2.8 128    648  4550  557  3490  4910  321  284  21 
25 3.9 7.8 6.3 129    563  4750  522  2890  4330  285  233  20 
 
26 5.4 8.3 5.0 232    500  4420  489  2820  3850  271  178  20 
27 5.6 8.3 3.7 140    592  3680  465  2730  3260  251  105  20 
28 5.0 12    5.5 127    539  3420  444  2570  2630  227  72  19 
29 6.4 11    5.9 132    ---  3500  473  2290  2110  182  62  20 
30 8.3 94    5.3 131    ---  2980  750  1800  1860  121  54  24 
 
31 8.8 ---    4.4 139    ---  2970  ---  1260  ---  101  48  --- 

TOTAL 110.6 310.7 287.7 7093.9 9982 58373 46147 72530 76160 19891 11739 799
MEAN 3.57 10.4 9.28 229 357 1883 1538 2340 2539 642 379 26.6
MAX 8.8 94 93 748 873 4750 3060 4540 5050 1650 1820 48
MIN 1.6 4.0 1.9 1.5 97 314 444 600 520 101 48 19
CFSM .00 .01 .01 .26 .41 2.17 1.77 2.70 2.93 .74 .44 .03
IN. .00 .01 .01 .30 .43 2.50 1.98 3.11 3.27 .85 .50 .03

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1949 - 1998, BY WATER YEAR (WY)
MEAN 179 259 546 597 859 1054 1073 965 829 395 254 144
MAX 2748 2846 4546 3788 4273 3669 3991 4482 3600 3053 3046 2876
(WY) 1970 1986 1968 1950 1982 1978 1994 1996 1974 1957 1958 1993
MIN 1.06 .67 .19 .75 4.48 13.1 79.0 17.9 3.20 1.74 1.02 1.13
(WY) 1989 1977 1977 1990 1989 1954 1977 1954 1988 1954 1964 1987

SUMMARY STATISTICS FOR 1997 CALENDAR YEAR FOR 1998 WATER YEAR WATER YEARS 1949 - 1998
ANNUAL TOTAL 104895.6   303423.9      
ANNUAL MEAN 287      831          595     
HIGHEST ANNUAL MEAN 1345      1973
LOWEST ANNUAL MEAN 26.3   1954
HIGHEST DAILY MEAN 4820          Mar 3 5050              Jun 23 19000      Apr 14 1994
LOWEST DAILY MEAN 1.5       Aug 18,21 1.5   A     Jan 4 .00 B
ANNUAL SEVEN-DAY MINIMUM 1.7       Aug 13 1.8           Oct 6 .00 Jun 9 1988
INSTANTANEOUS PEAK FLOW 5310              Jun 23 20300      Apr 14 1994
INSTANTANEOUS PEAK STAGE 24.76         Jun 23 32.40 Apr 14 1994
INSTANTANEOUS LOW FLOW 1.5           C
ANNUAL RUNOFF (CFSM) .33 .96     .69
ANNUAL RUNOFF (INCHES) 4.50 13.02     9.33
10 PERCENT EXCEEDS 798      2830          1580     
50 PERCENT EXCEEDS 36      271          164     
90 PERCENT EXCEEDS 2.7   3.2       5.4  
A - Due to regulation of dam.
B - Nov. 4-6, 1985; Sept.9, 1987; many days in 1988-90, 1992.
C - Oct. 10-11, Jan. 3-5, due to regulation of dam.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data