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" (NAD of 1927), 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 1994-2002.

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 NGVD of 1929.

 

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

 

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 31,800 ft3/s, May 12, 2002, gage height, 24.33 ft; no flow in some years.

 

REMARKS FOR CURRENT YEAR.-- Records fair except those for Oct. 19 to Nov. 28, July 3 to Sept. 5, and estimated daily discharges, which are poor.

DISCHARGE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002
DAILY MEAN VALUES
DAYOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEP
 
11.4901   328 191 3010 818 1670 2990 1110 276     e0.10130     
21.173   595 308 3150 1290 1410 2690 923 150     e0.1088     
32.017   707 360 2870 1370 1450 2590 583 198     0.1917     
41.815   647 243 2820 1580 1150 2440 319 202     0.184.5  
514   17   623 186 2930 1840 786 1770 e500 253     e0.102.2  
 
68.315   626 185 2790 1660 556 927 848 e240     e0.101.7  
77.416   341 258 1770 1690 561 4670 809 e180     e0.100.99
86.412   152 285 1190 1390 1050 3180 788 e60     e0.101.2  
96.814   142 187 1360 1480 1320 4030 759 e7.0  e0.101.0  
1022   10   193 152 1090 2320 1140 3420 550 9.2  e0.100.25
 
1144   9.8305 201 487 1960 1120 3350 861 4.5  0.46e0.10
1294   10   374 228 92 1510 1050 19600 2720 0.990.90e0.10
1338   9.2397 228 949 1560 966 11700 2850 0.371.6  e0.10
1434   10   423 205 978 1330 923 7010 2900 0.101.7  e0.10
1518   139   433 180 504 1420 778 5940 2730 0.221.5  0.17
 
1655   214   503 142 259 1480 518 6020 2560 8.3  5.0  e0.10
1723   15   1250 104 781 929 608 5580 2170 1.6  0.943.8  
18141   7.51990 102 718 547 735 3720 1830 0.763.6  1.7  
19403   6.62150 101 528 604 510 3660 1740 0.478.5  5.9  
20780   55   1840 102 2310 940 564 3080 1250 0.210.960.27
 
21229   175   1540 100 3230 1110 1980 2360 711 e0.100.92e0.10
2218   158   1280 99 3140 851 2690 2160 710 2.0  2.4  e0.10
2313   159   934 100 3180 282 1660 1840 650 0.5812     e0.10
24617   171   498 136 3100 336 1540 1400 304 0.35285     e0.10
251990   161   769 155 2800 760 2790 1090 385 0.291430     e0.10
 
261310   157   733 137 2260 1230 1890 1120 557 0.541500     e0.10
271040   156   577 136 1720 1050 2150 1050 477 8.4  1610     e0.10
28505   162   416 120 1140 774 4450 849 529 0.341240     e0.10
2955   176   357 85 --- 1420 3260 885 486 0.19741     e0.10
30930   304   281 128 --- 2020 3030 1120 455 0.10267     e0.10
 
311740   ---   268 1470 --- 1890 --- 883 --- 0.11125     ---     

TOTAL10148.23345.1216726614511563944144305113124340641605.727239.65260.18
MEAN327.4111.5699.1213.41827127214773649113551.80233.58.673
MAX1990901215014703230232044501960029002761610130
MIN1.16.614285922825108493040.100.100.10

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1983 - 2002, BY WATER YEAR (WY)
MEAN231.6544.7780.2639.3977.7114011141514936.1362.2116.8112.5
MAX22174041229430872803280236744027313119475151736
(WY)199419861991199320011998199419951998199319851993
MIN0.243.672.211.7921.916583.810817.32.690.330.18
(WY)199519831990200020002000198620011988198919961998

SUMMARY STATISTICSFOR 2001 CALENDAR YEARFOR 2002 WATER YEARWATER YEARS 1983 - 2002
ANNUAL TOTAL201722.94332974.85    
ANNUAL MEAN552.7  912.3      704.0      
HIGHEST ANNUAL MEAN1511         1993
LOWEST ANNUAL MEAN164         2000
HIGHEST DAILY MEAN7840         Feb 2619600             May 1219600         May 12 2002
LOWEST DAILY MEAN0.41    May 80.10        A0.00    B
ANNUAL SEVEN-DAY MINIMUM1.2      May 20.10 A    Sep 210.00    Oct 8 1988
MAXIMUM PEAK FLOW31800      C    May 1231800      CMay 12 2002
MAXIMUM PEAK STAGE24.33        May 1224.33    May 12 2002
INSTANTANEOUS LOW FLOW    D
10 PERCENT EXCEEDS1620     2630         2050         
50 PERCENT EXCEEDS158     360         221         
90 PERCENT EXCEEDS3.3  0.32    1.5      

A - Estimated, many days.

B - Many days in some years.

C - From rating curve extended above 17,000 ft3/s.

D - Minimum unknown, may have occured many days during July-Sept.



Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data