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.--
SURFACE-WATER DISCHARGE AND STAGE
 

DISCHARGE: July 1949 to current year.
 

STAGE: Water years 1994-2001.

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

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter and rain gage, 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.-- Beginning Apr. 14, 1955, diversion for Springfield's public-water supply periodically occurs upstream from the station and upstream from the dam between the confluence of Horse Creek and the gage. Occasional regulation caused by operation of gate at diversion dam.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 20,300 ft3/s, Apr. 14, 1994, gage height, 32.40 ft; no flow Nov. 4-6, 1985, Sept. 9, 1987, and for many days in 1988-90, 92, and 2000.

REMARKS FOR CURRENT YEAR.-- Records fair except those for estimated daily discharges, which are poor.
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 360  e230  636  e240  2810  4730  351  206  341  114    2.1 3.9
2 271  e220  559  e230  2970  4330  340  198  416  e103    1.4 31   
3 215  e210  502  e230  3040  3610  312  194  422  95    1.2 29   
4 178  e200  465  e240  2910  2800  287  192  730  89    1.3 4.6
5 548  e200  e400  e250  2550  2060  265  181  1660  84    1.0 2.6
 
6 2150  e200  e340  e260  1930  1530  263  171  3250  76    2.1 2.7
7 3790  e300  e280  e270  1270  1160  260  172  6610  75    2.3 2.9
8 4080  668  e310  e270  990  972  259  164  5320  69    2.2 1.9
9 4970  879  e330  e260  1170  813  266  161  6310  62    1.8 44   
10 5620  1030  e320  e260  1650  711  244  158  7290  60    1.8 75   
 
11 5260  1130  e310  e250  1820  647  1590  169  6670  53    1.6 82   
12 4390  1160  e360  e250  1920  596  1760  156  5460  46    1.3 34   
13 3420  1210  e400  e260  1940  554  1450  146  4230  41    1.9 26   
14 2130  1310  e450  e280  2030  511  1520  135  3020  36    2.0 34   
15 1300  1370  e500  e350  2160  488  1590  129  2090  32    1.8 30   
 
16 917  1350  e600  e500  2110  635  1520  124  1290  29    1.8 27   
17 787  1290  e550  e700  1980  898  1160  117  842  28    1.8 64   
18 711  1170  e500  e800  1790  1040  793  163  640  13    1.7 39   
19 642  1010  e470  e840  1670  1080  607  550  519  1.9 1.7 13   
20 565  837  e440  e740  1520  1130  532  670  419  2.1 2.1 28   
 
21 474  703  e410  e600  1310  1050  525  545  341  1.9 2.1 31   
22 441  617  e380  e550  1050  896  507  500  300  1.8 2.2 24   
23 403  559  e350  e500  883  794  480  465  270  1.5 2.4 20   
24 370  515  e330  e460  1200  685  398  390  247  1.3 38    19   
25 e340  488  e320  e420  3070  592  345  316  225  1.2 87    16   
 
26 e320  487  e310  e390  4190  521  292  270  200  1.4 17    13   
27 e300  516  e290  e370  3870  472  261  271  176  1.5 5.3 12   
28 e280  607  e280  e350  4440  413  248  318  154  1.4 5.0 10   
29 e270  684  e270  e700  ---  406  246  304  136  1.2 5.0 8.8
30 e250  699  e250  e2000  ---  392  222  266  124  1.9 3.7 7.6
 
31 e240  ---  e240  e2900  ---  361  ---  268  ---  2.3 3.5 ---   

TOTAL 45992 21849 12152 16720 60243 36877 18893 8069 59702 1126.4 206.1 736.0
MEAN 1484 728 392 539 2152 1190 630 260 1990 36.3 6.65 24.5
MAX 5620 1370 636 2900 4440 4730 1760 670 7290 114 87 82
MIN 178 200 240 230 883 361 222 117 124 1.2 1.0 1.9
CFSM 1.71 .84 .45 .62 2.48 1.37 .73 .30 2.30 .04 .01 .03
IN. 1.97 .94 .52 .72 2.58 1.58 .81 .35 2.56 .05 .01 .03
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1949 - 2001, BY WATER YEAR (WY)
MEAN 198 262 524 588 888 1024 1047 936 855 381 242 138
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 3.04 .053 2.80 17.9 3.20 1.74 1.02 1.13
(WY) 1989 1977 1977 1990 2000 2000 2000 1954 1988 1954 1964 1987

SUMMARY STATISTICS FOR 2000 CALENDAR YEAR FOR 2001 WATER YEAR WATER YEARS 1949 - 2001
ANNUAL TOTAL 111156.26 282565.5  
ANNUAL MEAN 304      774      589     
HIGHEST ANNUAL MEAN 1345      1973
LOWEST ANNUAL MEAN 26.3   1954
HIGHEST DAILY MEAN 5620          Oct 10 7290          Jun 10 19000      Apr 14 1994
LOWEST DAILY MEAN .00     A 1.0       Aug 5 .00 B
ANNUAL SEVEN-DAY MINIMUM .00     Mar 7 1.4       Jul 23 .00 Jun 9 1988
MAXIMUM PEAK FLOW 7400          Jun 10 20300      Apr 14 1994
MAXIMUM PEAK STAGE 26.64     Jun 10 32.40 Apr 14 1994
INSTANTANEOUS LOW FLOW .93     Aug 3,5
ANNUAL RUNOFF (CFSM) .35 .89 .68
ANNUAL RUNOFF (INCHES) 4.77 12.12 9.23
10 PERCENT EXCEEDS 750      2040      1570     
50 PERCENT EXCEEDS 18      340      161     
90 PERCENT EXCEEDS .00 2.4   5.0  

A- Many days.
B- Nov. 4-6, 1985, Sept. 9, 1987, many days in 1988-90,
1992 and 2000.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data