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 1994-2000.
 

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 1999 TO SEPTEMBER 2000
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 161  113  89  117  e94  380  274  523  2230  2030  313  100 
2 125  108  88  121  e103  332  242  591  1890  1680  270  93 
3 115  107  92  121  e108  313  207  736  1530  1390  250  87 
4 127  103  120  125  e110  314  193  644  1270  1310  304  82 
5 128  110  238  164  e110  314  181  401  869  1560  299  73 
 
6 119  120  205  147  e110  311  167  280  896  2750  494  67 
7 99  130  208  147  e110  299  168  243  993  3440  753  61 
8 145  133  145  136  e110  225  210  245  951  2860  647  57 
9 169  124  124  136  e112  171  380  299  698  2410  542  58 
10 223  113  134  128  116  146  376  331  610  1930  439  60 
 
11 174  99  119  113  140  149  240  420  707  1710  330  63 
12 135  101  116  108  146  159  178  505  678  1840  259  172 
13 117  97  104  107  138  160  155  456  803  2010  e210  115 
14 100  95  95  137  132  173  141  548  848  1820  e175  122 
15 90  95  131  119  127  406  131  733  1260  1400  150  105 
 
16 95  94  189  116  117  294  125  873  1510  1150  137  125 
17 111  101  139  108  115  215  153  687  1230  1000  140  112 
18 95  88  123  103  230  401  346  399  842  902  204  95 
19 96  83  111  102  400  307  542  424  926  814  267  82 
20 90  89  e100  e100  403  346  589  514  752  749  190  70 
 
21 88  90  e88  e94  297  789  529  610  2140  580  146  73 
22 87  96  e83  e98  252  1020  334  516  3610  549  134  71 
23 82  112  e87  e97  228  1040  325  311  3350  428  154  76 
24 79  124  e96  e96  212  522  542  403  3360  381  174  135 
25 75  118  e105  e93  187  336  1020  440  4180  499  139  167 
 
26 73  121  e94  e88  179  284  1250  449  4480  320  160  205 
27 83  101  e97  e84  172  539  1220  419  4490  258  221  303 
28 93  93  e100  e81  186  681  837  981  4140  227  203  583 
29 117  92  e103  e82  173  565  463  2440  3420  212  159  712 
30 111  88  e108  e84  ---  483  513  2650  2670  223  127  632 
 
31 114  ---  112  e87  ---  303  ---  2200  ---  331  112  --- 

TOTAL 3516 3138 3743 3439 4917 11977 12031 21271 57333 38763 8102 4756
MEAN 113 105 121 111 170 386 401 686 1911 1250 261 159
MAX 223 133 238 164 403 1040 1250 2650 4490 3440 753 712
MIN 73 83 83 81 94 146 125 243 610 212 112 57
CFSM .04 .04 .05 .04 .06 .15 .15 .26 .73 .48 .10 .06
IN. .05 .04 .05 .05 .07 .17 .17 .30 .81 .55 .12 .07

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1908 - 2000, BY WATER YEAR (WY)
MEAN 849 940 1128 1865 2257 2770 3274 3156 2314 1125 527 580
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 1999 CALENDAR YEAR FOR 2000 WATER YEAR WATER YEARS 1908 - 2000
ANNUAL TOTAL 649900      172986     
ANNUAL MEAN 1781      473      1725         
HIGHEST ANNUAL MEAN 4808          1927
LOWEST ANNUAL MEAN 114          1954
HIGHEST DAILY MEAN 10500          Feb 10 4490          Jun 27 67700          May 19 1943
LOWEST DAILY MEAN 73          Oct 26 57          Sep 8 3.0       A
ANNUAL SEVEN-DAY MINIMUM 81          Oct 21 63          Sep 5 3.0       Oct 3 1914
INSTANTANEOUS PEAK FLOW 4570          Jun 26 68700          May 19 1943
INSTANTANEOUS PEAK STAGE 13.64     Jun 26 31.52 B May 19 1943
INSTANTANEOUS LOW FLOW 55          Sep 8
ANNUAL RUNOFF (CFSM) .68 .18 .66    
ANNUAL RUNOFF (INCHES) 9.23 2.46 8.95    
10 PERCENT EXCEEDS 5420      1220      4620         
50 PERCENT EXCEEDS 376      172      658         
90 PERCENT EXCEEDS 96      90      60         
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