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 1994-2000.

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 Mar. 17 to May 28 and estimated daily discharges, which are poor.
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 20    34    15      5.9   6.3   .03 .00 .00 490      755  88  17   
2 7.8 38    14      6.1   7.9   .00 .00 .03 330      475  83  14   
3 8.4 39    7.4   6.8   7.4   .03 .00 .00 156      230  66  12   
4 8.3 46    1.1   5.2   7.0   .03 .00 .00 65      169  68  10   
5 6.1 58    2.8   .96 6.5   .09 .00 .08 5.0   158  77  8.8
 
6 5.2 51    1.7   21      6.3   .02 .00 .16 5.0   526  310  7.5
7 4.4 48    1.4   11      5.4   .00 .00 .00 13      806  356  6.4
8 7.8 40    1.4   13      4.9   .00 .00 .10 8.9   748  326  5.7
9 8.9 32    1.6   12      4.4   .00 .00 .11 1.6   705  304  5.1
10 14    26    .84 4.8   4.2   .00 .00 .37 1.1   627  253  4.8
 
11 19    21    .71 2.7   3.9   .00 .00 .18 .74 557  165  4.8
12 18    17    .90 3.5   3.5   .00 .00 .28 .58 454  98  6.6
13 15    15    .97 43      3.0   .00 .00 .11 1.5   396  62  4.9
14 11    13    .75 9.0   2.6   .00 .00 .26 2.9   476  44  11   
15 8.9 10    94      8.0   2.6   .00 .00 .36 50      436  33  28   
 
16 12    7.1 14      7.7   2.1   .00 .00 2.1   97      331  26  36   
17 12    6.4 9.6   7.1   1.6   e.00 .00 .34 44      223  22  32   
18 11    8.4 9.0   7.0   1.8   e.00 .01 .12 2.3   156  21  24   
19 9.6 12    8.7   6.9   1.3   e.00 .00 .04 7.1   232  18  19   
20 8.4 14    8.7   e6.6   1.3   e.00 .05 .66 2.6   277  16  15   
 
21 6.9 14    8.7   e6.4   1.2   e.00 .00 .70 1010      180  17  13   
22 6.5 13    8.2   e6.8   .88 e.45 .00 .24 1340      128  15  11   
23 7.5 14    7.8   e6.8   .72 e.50 .00 .01 970      85  13  11   
24 5.8 14    8.2   e6.6   .57 .00 .00 .20 1030      61  12  15   
25 5.3 12    8.1   e6.2   .37 .01 10      .07 1430      49  23  12   
 
26 5.1 12    7.8   e6.0   .17 .16 38      .65 1580      41  97  3.4
27 14    13    7.5   e5.6   .01 .15 32      .93 1600      34  118  221   
28 43    14    7.2   e5.4   .03 .12 3.8   210      1500      30  69  507   
29 40    16    6.7   e5.5   .14 .04 .00 623      1320      39  43  643   
30 44    17    6.4   e5.7   ---      .00 .00 622      1030      48  31  504   
 
31 42    ---    6.1   e6.0   ---      .00 ---      531      ---      104  23  ---   

TOTAL 435.9 674.9 277.27 255.26 88.09 1.63 83.86 1994.10 14094.32 9536 2897 2213.0
MEAN 14.1 22.5 8.94 8.23 3.04 .053 2.80 64.3 470 308 93.5 73.8
MAX 44 58 94 43 7.9 .50 38 623 1600 806 356 643
MIN 4.4 6.4 .71 .96 .01 .00 .00 .00 .58 30 12 3.4
CFSM .02 .03 .01 .01 .00 .00 .00 .07 .54 .35 .11 .09
IN. .02 .03 .01 .01 .00 .00 .00 .09 .60 .41 .12 .09

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1949 - 2000, BY WATER YEAR (WY)
MEAN 173 252 526 589 863 1020 1056 949 833 388 247 140
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 1999 CALENDAR YEAR FOR 2000 WATER YEAR WATER YEARS 1949 - 2000
ANNUAL TOTAL 210856.37 32551.33
ANNUAL MEAN 578      88.9   585     
HIGHEST ANNUAL MEAN 1345      1973
LOWEST ANNUAL MEAN 26.3   1954
HIGHEST DAILY MEAN 4580          Feb 11 1600          Jun 27 19000      Apr 14 1994
LOWEST DAILY MEAN .71     Dec 11 .00     A .00 B
ANNUAL SEVEN-DAY MINIMUM 1.0       Dec 8 .00     Mar 7 .00 Jun 9 1988
INSTANTANEOUS PEAK FLOW 1650          Jun 27 20300      Apr 14 1994
INSTANTANEOUS PEAK STAGE 15.16     Jun 27 32.40 Apr 14 1994
ANNUAL RUNOFF (CFSM) .67 .10 .68
ANNUAL RUNOFF (INCHES) 9.05 1.40 9.17
10 PERCENT EXCEEDS 2030      260      1550     
50 PERCENT EXCEEDS 89      7.5   158     
90 PERCENT EXCEEDS 5.4   .00 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