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 1994-2000.

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 1999 TO SEPTEMBER 2000
DAILY MEAN VALUES
DAYOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEP
 
13.4  3.35.31.3  e1.2192   5.7  339   913 516 7.22.9
22.5  3.55.41.5  1.3188   1.2  426   788 517 13   2.9
35.2  3.55.67.4  1.4188   .42271   616 543 11   3.1
44.1  16   6.06.7  1.5188   e.1073   398 543 5.52.8
52.9  20   41   4.3  1.3188   e.103.9476 2360 103   2.7
 
62.6  13   24   3.2  1.3118   15     10   577 1930 193   2.7
72.9  9.29.02.4  1.320   163     38   529 1120 146   2.7
833     7.84.51.9  1.35.9248     74   334 1030 73   2.5
914     6.93.11.9  1.42.9146     128   357 585 15   2.4
105.2  6.03.22.0  2.31.513     246   400 475 6.34.9
 
111.8  4.92.01.7  2.41.92.2  277   366 710 4.42.0
12.924.41.71.4  2.41.6.36229   256 1100 3.55.4
131.2  4.21.31.4  2.4163   e.10293   404 786 3.21.8
141.2  4.12.31.1  2.4253   e.10505   670 380 2.93.5
151.3  3.62.61.1  2.437   e.10565   857 325 2.91.7
 
161.6  3.42.6.992.5181   18     304   638 343 2.91.7
172.0  3.22.3.782.4195   331     167   480 351 17   1.7
181.8  3.21.8.7667   21   338     203   566 244 18   1.6
191.7  3.31.7.9635   136   144     347   277 61 3.31.7
201.6  3.11.71.1  16   405   42     372   130 106 2.72.1
 
211.6  3.11.3.958.6590   72     215   909 137 2.71.8
221.8  3.41.11.0  6.1554   171     106   1260 40 3.92.4
231.7  7.51.01.1  5.467   295     211   1490 209 4.42.0
241.6  11   1.21.1  6.511   552     256   1530 199 3.224   
251.5  9.21.21.1  7.364   694     200   1440 36 2.815   
 
261.5  8.11.31.1  13   392   652     94   1520 19 4.05.1
271.5  7.11.11.0  20   371   277     323   1240 15 2.93.0
281.8  6.41.2.96170   310   123     1520   1010 12 2.82.4
292.0  6.01.2e1.0  248   171   217     1730   683 53 2.92.1
302.3  5.51.3e1.1  ---   55   226     973   494 42 2.72.1
 
312.8  ---   1.3e1.2  ---   57   ---     1180   --- 17 2.8---   

TOTAL111.02193.9140.355.50634.15128.84747.3811678.92160814804668.9112.7
MEAN3.586.464.531.7921.916515837772047821.63.76
MAX3320417.424859069417301530236019324
MIN.923.11.0.761.21.5.103.9130122.71.6

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1983 - 2000, BY WATER YEAR (WY)
MEAN234575817682831113011271473935399116124
MAX22174041229430872230280236744027313119475151736
(WY)199419861991199319841998199419951998199319851993
MIN.243.672.211.7921.916583.812917.32.69.33.18
(WY)199519831990200020002000198619881988198919961998

SUMMARY STATISTICSFOR 1999 CALENDAR YEARFOR 2000 WATER YEARWATER YEARS 1983 - 2000
ANNUAL TOTAL174855.0259883.50    
ANNUAL MEAN479     164         703         
HIGHEST ANNUAL MEAN1511         1993
LOWEST ANNUAL MEAN164         2000
HIGHEST DAILY MEAN4040         Apr 212360             Jul 516400         Apr 15 1994
LOWEST DAILY MEAN.92    Oct 12.10        A.00    B
ANNUAL SEVEN-DAY MINIMUM1.1      Jan 10.93        Jan 16.00    Oct 8 1988
INSTANTANEOUS PEAK FLOW3980             Jul 517100      CApr 15 1994
INSTANTANEOUS PEAK STAGE14.10        Jul 523.04 DMay 2 1983
INSTANTANEOUS LOW FLOW E
10 PERCENT EXCEEDS1310     543         2050         
50 PERCENT EXCEEDS40     5.9      222         
90 PERCENT EXCEEDS1.7  1.2      1.5      
A - Estimated, Apr. 4-5 and 13-15.
B - Many days in some years.
C - Gage height, 21.12 ft.
D - Discharge, 12,400 ft3/s.
E - Minimum unknown, probably occurred during periods when Lake Decatur Dam was closed Apr. 4-6 and 12-16.

Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data