Station list     Available data
ILLINOIS RIVER BASIN


05576000       SOUTH FORK SANGAMON RIVER NEAR ROCHESTER, IL

 

LOCATION.-- Lat 39°44'32", long 89°34'02" (NAD of 1927), 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. Auxiliary gage 1.2 miles downstream.
 

DRAINAGE AREA.-- 867 mi2.
 

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE
 

DISCHARGE: July 1949 to current year.
 

STAGE: Water years 1994 to current year.
 

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

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter, and crest-stage gage. Datum of gage is 511.30 ft above NGVD of 1929. 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; maximum gage height, 33.65 ft, May 13, 2002, discharge 14,100 ft3/s; 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. 28-Apr. 29, July 20-26, and Aug. 3-8 and those for estimated daily discharges, which are poor.
Discharge, cubic feet per second, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 43    35    12    36    4.2 3.5 61      145  424  236  44    724 
2 17    89    12    50    3.3 e3.2 1.8   173  383  193  46    1490 
3 14    98    11    60    3.2 e3.0 0.87 227  321  158  262    1710 
4 9.7 67    11    55    3.9 e2.8 2.5   187  298  142  636    2090 
5 4.5 78    11    48    3.3 e2.6 40      324  286  130  992    2200 
 
6 3.6 45    11    43    1.9 e2.4 312      617  273  117  797    2050 
7 3.0 46    10    41    e2.2 e2.3 358      980  277  107  390    1700 
8 3.0 28    10    26    e3.0 e2.2 377      854  273  93  183    1060 
9 2.5 11    10    1.6 e2.2 2.1 351      781  261  85  117    440 
10 2.6 34    10    2.0 e1.9 2.2 192      2670  247  112  68    117 
 
11 2.6 35    10    3.0 e1.9 2.3 268      5620  301  272  23    129 
12 3.0 22    10    15    e1.9 2.6 176      4520  541  458  8.9 214 
13 3.2 2.7 10    14    e2.0 3.3 150      3860  794  383  7.8 92 
14 2.7 2.9 10    2.5 e2.0 40    140      3500  1260  245  6.5 72 
15 1.9 2.9 10    1.7 e2.1 109    124      3210  1410  263  6.5 61 
 
16 2.1 6.5 11    2.3 e2.1 96    97      2960  1580  285  6.6 51 
17 1.9 34    11    3.3 2.2 76    106      2470  1520  292  6.8 40 
18 2.0 64    5.7 4.4 2.3 64    127      e1790  1330  176  12    32 
19 2.4 25    1.2 18    2.7 46    128      1180  1000  192  58    28 
20 2.5 17    105    13    3.5 54    104      1030  692  439  56    26 
 
21 2.2 41    205    e20    82    102    95      1070  551  695  19    23 
22 1.5 14    153    e28    200    166    52      1010  448  882  18    21 
23 1.8 14    105    e12    137    187    61      981  400  884  16    18 
24 2.4 13    e82    e5.0 106    140    114      933  346  723  14    16 
25 2.5 13    e64    e2.5 59    143    91      819  295  376  13    14 
 
26 1.8 13    e52    e1.5 37    90    58      663  275  196  13    15 
27 3.8 13    e44    e2.0 17    64    81      549  300  126  12    17 
28 54    12    e40    e3.0 4.6 83    170      473  374  56  12    26 
29 24    12    36    e4.5 ---    141    244      420  318  55  12    31 
30 49    12    33    e7.0 ---    140    159      373  279  73  12    28 
 
31 22    ---    32    4.9 ---    156    ---      367  ---  94  23    --- 

TOTAL 292.2 900.0 1137.9 530.2 694.4 1931.5 4241.17 44756 17057 8538 3891.1 14535
MEAN 9.43 30.0 36.7 17.1 24.8 62.3 141 1444 569 275 126 484
MAX 54 98 205 60 200 187 377 5620 1580 884 992 2200
MIN 1.5 2.7 1.2 1.5 1.9 2.1 0.87 145 247 55 6.5 14
CFSM 0.01 0.03 0.04 0.02 0.03 0.07 0.16 1.67 0.66 0.32 0.14 0.56
IN. 0.01 0.04 0.05 0.02 0.03 0.08 0.18 1.92 0.73 0.37 0.17 0.62
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1949 - 2003, BY WATER YEAR (WY)
MEAN 197 256 526 573 889 1016 1054 1048 893 375 236 143
MAX 2748 2846 4546 3788 4273 3669 3991 6489 3600 3053 3046 2876
(WY) 1970 1986 1968 1950 1982 1978 1994 2002 1974 1957 1958 1993
MIN 1.06 0.67 0.19 0.75 3.04 0.053 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 2002 CALENDAR YEAR FOR 2003 WATER YEAR WATER YEARS 1949 - 2003
ANNUAL TOTAL 483647.6   98504.47    
ANNUAL MEAN 1325      270          599         
HIGHEST ANNUAL MEAN 1461          2002
LOWEST ANNUAL MEAN 26.3       1954
HIGHEST DAILY MEAN 14900          May 13 5620              May 11 19000          Apr 14 1994
LOWEST DAILY MEAN 1.2       Dec 19 0.87 A     Apr 3 0.00     B
ANNUAL SEVEN-DAY MINIMUM 2.0       Jul 30 2.0           Feb 10 0.00     Jun 9 1988
MAXIMUM PEAK FLOW 6190      C     May 11 20300      D Apr 14 1994
MAXIMUM PEAK STAGE 24.15 E     May 11 33.65 F May 13 2002
INSTANTANEOUS LOW FLOW 0.74 A     Apr 3
ANNUAL RUNOFF (CFSM) 1.53 0.31     0.69    
ANNUAL RUNOFF (INCHES) 20.75 4.23     9.39    
10 PERCENT EXCEEDS 3850      786          1610         
50 PERCENT EXCEEDS 256      48          163         
90 PERCENT EXCEEDS 3.0   2.4       4.8      

A - Due to regulation.

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

C - Gage height, 24.07 ft.

D - Gage height, 32.40 ft.

E - Discharge, 5,970 ft3/s.

F - Discharge, 14,100 ft3/s.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data