Station list     Available data
ILLINOIS RIVER BASIN


05573540       SANGAMON RIVER AT ROUTE 48 AT DECATUR, IL



LOCATION.-- Lat 39°49'52", long 88°58'35", in NE1/4NE1/4 sec.21, T.16 N., R.2 E., Macon County, Hydrologic Unit 07130006, on right upstream side of bridge on State Highway 48 in Decatur, 1.2 mi downstream from Lake Decatur Dam, 2.5 mi upstream from Stevens Creek, and at mile 129.0.

DRAINAGE AREA.-- 938 mi2.

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

DISCHARGE: October 1982 to current year.

 

STAGE: Water years 1994-2001.

SURFACE-WATER QUALITY
 

CHEMICAL: Water years 1979-91.


REVISED RECORDS.-- WDR IL-94-2: 1992

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 583.43 ft above sea level.

REMARKS.-- Flow regulated by Lake Decatur Dam, 1.2 mi upstream.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 17,100 ft3/s, Apr. 15, 1994, gage height, 21.12 ft; maximum gage height, 23.04 ft, May 2, 1983, discharge, 12,400 ft3/s; no flow in some years.

REMARKS FOR CURRENT YEAR.-- Records fair 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
DAYOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEP
 
12.1  e.1057   2.43020 5070 458   2.3  168   9.44.117   
22.2  .11133   21   2750 3760 290   1.5  91   9.218   10   
32.3  e.10140   60   2440 2970 446   1.4  80   15   5.26.3
46.5  e.10128   70   2240 2240 500   1.3  382   7.84.45.5
558     .24138   72   2120 1510 294   1.4  747   59   3.84.4
 
6502     300     185   71   1350 1580 338   1.5  4880   85   3.616   
7804     693     230   71   1570 1270 343   .823530   12   3.78.2
8162     383     209   149   1880 842 420   .412150   7.43.63.5
912     347     185   226   2000 617 323   70     1410   49   3.79.4
102.0  567     186   183   2340 656 525   131     1400   26   3.63.4
 
11110     569     206   109   2420 735 3340   239     822   7.53.62.7
12123     565     207   71   2400 688 553   221     1030   5.63.72.4
136.1  880     205   66   e3500 620 366   199     966   11   3.92.0
141.5  1070     331   71   e2900 835 1060   61     578   26   3.82.3
15181     1030     449   83   e2600 828 757   2.4  447   9.13.72.1
 
16428     915     452   165   2680 505 435   1.0  429   6.15.42.1
17344     882     449   316   2630 80 408   .71415   4.93.22.2
18137     845     318   426   2280 1360 311   45     340   6.931   6.7
196.8  642     195   379   1600 1660 289   115     270   4.611   3.3
2015     339     187   291   1400 958 500   120     44   4.33.92.3
 
211.6  370     186   284   1250 1270 553   196     222   4.03.33.5
22e.10481     184   283   747 1220 1000   273     363   4.03.32.1
237.0  326     183   282   725 948 134   230     377   4.015   1.7
241.4  192     183   281   1710 797 98   101     376   3.712   1.4
25e.10104     181   278   7150 701 15   27     375   4.15.21.4
 
26e.1060     148   279   7840 473 5.027     371   4.33.71.3
27e.10376     149   278   6630 368 258   267     197   3.63.21.2
28e.10568     112   145   6320 633 865   343     24   6.12.39.7
29.11518     16   122   --- 571 378   253     12   15   3.25.6
30.4061     3.21430   --- 525 30   176     9.84.093   1.4
 
31e.10---     2.62650   --- 481 ---   230     ---   3.9109   ---   

TOTAL2916.6113083.655937.89214.4784923677115292.03338.7422505.8422.5380.1141.1
MEAN94.14361922972803118651010875013.612.34.70
MAX8041070452265078405070334034348808510917
MIN.10.102.62.4725805.0.419.83.62.31.2

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1983 - 2001, BY WATER YEAR (WY)
MEAN227568784662933113310951401926379111118
MAX22174041229430872803280236744027313119475151736
(WY)199419861991199320011998199419951998199319851993
MIN.243.672.211.7921.916583.810817.32.69.33.18
(WY)199519831990200020002000198620011988198919961998

SUMMARY STATISTICSFOR 2000 CALENDAR YEARFOR 2001 WATER YEARWATER YEARS 1983 - 2001
ANNUAL TOTAL81376.34188495.70
ANNUAL MEAN222     516     693         
HIGHEST ANNUAL MEAN1511         1993
LOWEST ANNUAL MEAN164         2000
HIGHEST DAILY MEAN2360         Jul 57840         Feb 2616400         Apr 15 1994
LOWEST DAILY MEAN.10    A.10    A.00    B
ANNUAL SEVEN-DAY MINIMUM.14    Oct 25.14    Oct 25.00    Oct 8 1988
MAXIMUM PEAK FLOW9020         Feb 2517100      CApr 15 1994
MAXIMUM PEAK STAGE17.85    Feb 2523.04 DMay 2 1983
INSTANTANEOUS LOW FLOW    E
10 PERCENT EXCEEDS623     1420     2040         
50 PERCENT EXCEEDS61     149     216         
90 PERCENT EXCEEDS1.1  2.1  1.5      

A- Estimated, several days.
B- Many days in some years.
C- Gage height, 21.12 ft.
D- Discharge, 12,400 ft3/s.
E- Minimum unknown, may have occured Oct. 21- Nov. 5.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data