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.
 

DRAINAGE AREA.-- 867 mi2.
 

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE
 

DISCHARGE: July 1949 to current year.
 

STAGE: Water years 1994-2002.
 

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 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 estimated daily discharges, which are poor.
DISCHARGE -SLOPE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 7.0 464  814  e430  3050  913  2950  5610  2550  485    2.0 18   
2 6.2 412  891  e400  3460  949  2880  6080  2400  414    1.7 16   
3 5.8 336  783  e440  3330  1740  2550  5750  e1800  356    1.9 14   
4 5.7 311  700  e470  3490  1900  e2020  5180  1190  314    1.7 12   
5 9.2 289  623  434  3430  1840  1450  4630  924  276    2.4 11   
 
6 11    272  565  390  3290  1750  1060  4140  911  245    98    9.9
7 9.7 260  522  369  2870  1710  851  4720  822  216    15    9.4
8 9.4 251  455  349  e2300  1590  888  5650  785  189    3.5 9.1
9 13    238  392  361  e1750  1620  1240  8690  745  168    2.8 8.6
10 13    230  349  345  1280  1870  1350  11200  716  151    2.8 8.5
 
11 12    221  316  334  1030  1830  1340  11000  e1250  138    2.4 7.6
12 55    183  303  325  900  1860  1300  13200  4170  135    3.1 7.8
13 245    132  366  315  818  1890  1240  14900  6860  145    2.9 7.9
14 618    100  539  311  787  1890  1100  14300  10000  148    2.9 7.7
15 657    84  1000  301  766  1780  1000  14100  12100  152    2.8 8.9
 
16 697    76  1350  290  692  e1500  923  12400  11300  89    2.9 9.3
17 758    71  e2080  280  606  e1370  825  10800  8980  165    3.3 8.8
18 755    69  e2650  267  571  e1110  737  8620  6840  91    121    9.1
19 634    69  2720  262  646  1010  665  6660  5390  75    78    22   
20 487    66  2900  261  1040  956  1210  5410  4270  64    71    54   
 
21 369    61  2900  263  e1570  939  e2500  4460  2850  57    29    374   
22 263    62  2630  259  e1820  922  3710  3830  e1500  52    27    226   
23 220    63  2260  264  e1940  921  3590  2990  1010  30    91    66   
24 196    85  1820  261  e2040  881  3470  e2330  823  4.4 68    42   
25 e800    124  1350  256  e2080  886  3970  e1900  706  3.3 45    15   
 
26 e1000    121  1020  253  e1960  1210  3880  e1600  675  3.8 111    5.2
27 e900    135  859  247  e1660  1510  4140  1410  885  158    121    4.7
28 e700    132  763  240  1190  1960  5750  2000  889  89    142    5.1
29 e560    129  682  236  ---  2490  5510  2460  740  12    107    4.8
30 e480    355  595  259  ---  2700  5160  2660  589  2.3 41    49   
 
31 438    ---  e470  1310  ---  2880  ---  2480  ---  2.2 18    ---   

TOTAL 10934.0 5401 35667 10782 50366 48377 69259 201160 94670 4430.0 1222.1 1051.4
MEAN 352.7 180.0 1151 347.8 1799 1561 2309 6489 3156 142.9 39.42 35.05
MAX 1000 464 2900 1310 3490 2880 5750 14900 12100 485 142 374
MIN 5.7 61 303 236 571 881 665 1410 589 2.2 1.7 4.7
CFSM 0.41 0.21 1.33 0.40 2.07 1.80 2.66 7.48 3.64 0.16 0.05 0.04
IN. 0.47 0.23 1.53 0.46 2.16 2.08 2.97 8.63 4.06 0.19 0.05 0.05
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1949 - 2002, BY WATER YEAR (WY)
MEAN 200.9 260.1 535.6 583.8 904.7 1034 1071 1040 898.8 376.9 238.4 136.3
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 2001 CALENDAR YEAR FOR 2002 WATER YEAR WATER YEARS 1949 - 2002
ANNUAL TOTAL 254574.5   533319.5      
ANNUAL MEAN 697.5   1461          605.5      
HIGHEST ANNUAL MEAN 1461          2002
LOWEST ANNUAL MEAN 26.3       1954
HIGHEST DAILY MEAN 7290          Jun 10 14900              May 13 19000          Apr 14 1994
LOWEST DAILY MEAN 1.0       Aug 5 1.7           Aug 2,4 0.00     A
ANNUAL SEVEN-DAY MINIMUM 1.4       Jul 23 2.0           Jul 30 0.00     Jun 9 1988
MAXIMUM PEAK FLOW 16500      B     May 13 20300      C Apr 14 1994
MAXIMUM PEAK STAGE 33.65 D     May 13 33.65 D May 13 2002
INSTANTANEOUS LOW FLOW 1.5           Aug 2,4,5
ANNUAL RUNOFF (CFSM) 0.80 1.69     0.70    
ANNUAL RUNOFF (INCHES) 10.92 22.88     9.49    
10 PERCENT EXCEEDS 1990      3850          1630         
50 PERCENT EXCEEDS 270      565          167         
90 PERCENT EXCEEDS 2.4   9.0       5.0      

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

B - Gage height, 32.55 ft.

C - Gage height, 32.40 ft.

D - Discharge, 14100 ft3/s.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data