Station list     Available data
ILLINOIS RIVER BASIN


05576500       SANGAMON RIVER AT RIVERTON, IL



LOCATION.-- Lat 39°50'35", long 89°32'50", in NW1/4NE1/4 sec.16, T.16 N., R.4 W., Sangamon County, Hydrologic Unit 07130008, at right abutment on former U.S. Highway 36 bridge in Riverton, 2.2 mi downstream from Sugar Creek, 5.6 mi upstream from Fancy Creek, and at mile 83.1.

DRAINAGE AREA.-- 2,618 mi2.

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
 

DISCHARGE: February 1908 to December 1912, August 1914 to October 1956, and January 1986 to current year.
 

STAGE: Water years 1994-2001.
 

PARTIAL RECORD: Annual maximum, water years 1957-85.
SURFACE-WATER QUALITY
 

CHEMICAL: Water years 1978-91.
 

MISCELLANEOUS: May and July 1998.

REVISED RECORDS.-- WSP 1208: 1908-9, 1921-22, 1926-27, 1947. 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 508.38 ft above sea level. Prior to Aug. 14, 1934, chain gage on old Wabash Railway bridge (currently Norfolk and Western Railway bridge), 1,450 ft downstream, at datum 5.61 ft lower.

REMARKS.-- Some regulation by municipal reservoirs at Decatur (since 1922) and at Springfield (since 1934).

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 68,700 ft3/s, May 19, 1943, gage height, 31.52 ft, from graph based on gage readings; minimum daily, 3.0 ft3/s, Oct. 3-15, 1914.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: The high water of 1883 reached a stage of approximately 32 ft with respect to the gage at the old Wabash Railway bridge. The high water of 1875 is said to have been about one-half foot lower.

REMARKS FOR CURRENT YEAR.-- Records good 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
 
1 446  240  902  e375  8860  16100  1310  771  1020  447  110  401 
2 349  233  658  e370  7840  14800  1290  618  1230  393  109  161 
3 290  224  602  e370  7370  12800  995  545  1150  351  122  137 
4 262  222  575  e380  6810  10000  978  511  1890  336  152  115 
5 449  214  641  e400  6120  7700  1060  e500  3770  363  119  102 
 
6 2150  235  562  e420  5060  5220  1180  e490  6860  331  105  99 
7 3610  569  505  e430  3310  3520  1030  482  15700  373  100  112 
8 4290  1510  564  e440  2760  3030  917  483  20800  323  98  135 
9 4480  1890  550  e430  3550  2500  945  441  16800  e260  97  164 
10 4720  2200  503  e420  4690  2140  932  424  13500  e230  96  181 
 
11 4660  2500  560  e410  5190  1920  3390  695  11900  e200  94  167 
12 4040  2400  e620  e400  5000  1830  5660  901  9920  e185  94  147 
13 3290  2350  e700  e410  4950  1760  5040  819  8090  176  92  104 
14 2450  2630  e850  e450  5370  1590  3460  756  6400  164  97  108 
15 1630  2740  e1000  e600  5780  1700  3370  631  4380  158  96  105 
 
16 1230  2630  e1200  e900  6430  2370  3310  470  2880  156  103  101 
17 1360  2610  e1050  1250  5870  2590  2470  396  2180  153  101  111 
18 1280  2440  e950  1340  5500  2410  1920  745  1850  156  104  128 
19 952  2180  e850  1340  4960  2770  1640  1230  1600  140  107  136 
20 733  1640  e780  1200  3980  3180  1470  1360  1360  142  160  148 
 
21 621  1100  e720  1000  3290  2800  1820  1230  1110  131  116  151 
22 555  951  e670  e850  2660  2530  1800  1230  1230  125  103  129 
23 496  980  e620  778  2250  2420  1900  1230  1260  123  162  123 
24 440  847  e570  720  3140  2100  1270  1130  1190  127  208  112 
25 399  706  e530  664  7900  1850  1020  923  1110  124  233  106 
 
26 372  656  e490  e620  13600  1720  859  770  1050  113  162  102 
27 342  648  e460  e580  17100  1580  772  779  984  e105  113  99 
28 308  1170  e430  e550  16900  1220  826  922  845  e120  102  97 
29 287  1100  e410  1910  ---  1480  1440  1040  583  e140  97  94 
30 267  1220  e390  6940  ---  1400  1120  947  501  e150  93  90 
 
31 253  ---  e380  8730  ---  1250  ---  891  ---  e120  245  --- 

TOTAL 47011 41035 20292 35677 176240 120280 55194 24360 143143 6415 3790 3965
MEAN 1516 1368 655 1151 6294 3880 1840 786 4771 207 122 132
MAX 4720 2740 1200 8730 17100 16100 5660 1360 20800 447 245 401
MIN 253 214 380 370 2250 1220 772 396 501 105 92 90
CFSM .58 .52 .25 .44 2.40 1.48 .70 .30 1.82 .08 .05 .05
IN. .67 .58 .29 .51 2.50 1.71 .78 .35 2.03 .09 .05 .06
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1908 - 2001, BY WATER YEAR (WY)
MEAN 860 947 1120 1853 2322 2788 3251 3118 2353 1111 520 573
MAX 12280 5516 7500 12940 7762 8117 14100 16760 8596 4819 5914 12730
(WY) 1927 1942 1928 1950 1951 1939 1922 1943 1998 1951 1915 1926
MIN 7.29 12.6 27.5 29.5 34.6 50.8 180 113 146 49.1 40.7 22.3
(WY) 1915 1915 1915 1918 1931 1954 1931 1954 1934 1954 1936 1922

SUMMARY STATISTICS FOR 2000 CALENDAR YEAR FOR 2001 WATER YEAR WATER YEARS 1908 - 2001
ANNUAL TOTAL 270927      677402     
ANNUAL MEAN 740      1856      1727         
HIGHEST ANNUAL MEAN 4808          1927
LOWEST ANNUAL MEAN 114          1954
HIGHEST DAILY MEAN 4720          Oct 10 20800          Jun 8 67700          May 19 1943
LOWEST DAILY MEAN 57          Sep 8 90          Sep 30 3.0       A
ANNUAL SEVEN-DAY MINIMUM 63          Sep 5 95          Aug 9 3.0       Oct 3 1914
MAXIMUM PEAK FLOW 21800          Jun 8 68700          May 19 1943
MAXIMUM PEAK STAGE 22.72     Jun 8 31.52 B May 19 1943
INSTANTANEOUS LOW FLOW 88          Sep 30
ANNUAL RUNOFF (CFSM) .28 .71 .66    
ANNUAL RUNOFF (INCHES) 3.85 9.63 8.96    
10 PERCENT EXCEEDS 2140      4980      4620         
50 PERCENT EXCEEDS 399      778      660         
90 PERCENT EXCEEDS 108      113      61         

A - Oct. 3-15, 1914.
B - From graph based on gage readings.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data