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 to current year.

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 Aug. 19 to Sept. 30, and estimated daily discharges, which are poor.
Discharge, cubic feet per second, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 e0.10 4.6 16    2.9   e0.45 e48      127      e0.10 254  260      143    495 
2 e0.10 4.6 27    2.6   e0.50 e44      2.0   0.49 327  14      201    1120 
3 0.35 5.0 35    2.6   e0.56 e22      e0.10 2.7   350  e0.10 184    1270 
4 5.7   5.6 28    2.4   e0.60 3.4   31      159      196  e0.10 172    1150 
5 e0.10 9.6 26    2.6   e0.45 21      85      640      148  e0.10 225    690 
 
6 0.38 9.5 24    2.4   0.35 49      89      796      167  e0.10 368    347 
7 0.59 9.3 22    2.3   e0.10 53      49      995      175  e0.10 474    331 
8 0.76 9.7 18    2.0   e0.10 52      0.43 867      139  32      318    274 
9 0.79 11    15    2.0   e0.10 48      471      716      142  401      271    217 
10 1.1   14    15    1.6   e0.10 45      662      2910      143  1190      236    122 
 
11 1.4   16    15    1.3   e0.10 45      560      2210      215  1270      62    55 
12 1.6   17    14    1.2   e0.10 74      450      1440      1330  1240      11    54 
13 1.5   17    14    1.2   e0.10 237      386      1610      1790  1440      3.9 51 
14 1.9   18    14    1.1   e0.46 257      169      1300      2870  2090      3.7 50 
15 1.9   19    14    e1.0   e0.44 16      19      1600      2570  2270      3.7 41 
 
16 1.8   18    14    e0.94 e0.41 239      104      1230      1680  2150      3.8 33 
17 1.8   18    15    e0.86 e0.38 517      301      954      1690  1080      3.1 28 
18 11      18    67    e0.80 e0.37 183      284      876      1070  515      3.1 27 
19 16      20    42    e0.74 e0.38 504      208      613      1160  542      3.7 26 
20 3.3   20    14    e0.68 e0.42 619      194      610      748  525      3.9 24 
 
21 1.4   24    6.1 e0.63 e0.47 618      85      717      472  908      3.9 23 
22 0.89 25    3.9 e0.58 e0.60 597      1.5   493      440  855      3.8 22 
23 11      23    2.4 e0.53 e40      324      0.34 362      276  702      3.5 19 
24 10      21    2.2 e0.49 e86      7.5   21      282      220  479      3.7 18 
25 8.1   21    2.3 e0.45 e76      e0.10 194      229      180  331      3.9 15 
 
26 3.2   19    1.8 e0.40 e62      e0.10 202      255      347  175      4.1 25 
27 2.0   19    1.5 e0.35 e57      e0.10 144      362      454  168      4.2 22 
28 2.4   18    1.6 e0.33 e53      96      131      298      275  168      3.7 18 
29 9.0   19    2.1 e0.32 ---      463      58      278      220  166      18    15 
30 4.3   18    3.5 e0.36 ---      486      0.42 181      429  165      3.7 15 
 
31 4.3   ---    3.3 e0.40 ---      370      ---      179      ---  164      50    --- 

TOTAL 108.76 470.9 479.7 38.06 381.54 6038.20 5028.79 23165.29 20477 19300.50 2796.4 6597
MEAN 3.51 15.7 15.5 1.23 13.6 195 168 747 683 623 90.2 220
MAX 16 25 67 2.9 86 619 662 2910 2870 2270 474 1270
MIN 0.10 4.6 1.5 0.32 0.10 0.10 0.10 0.10 139 0.10 3.1 15
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1983 - 2003, BY WATER YEAR (WY)
MEAN 221 520 744 609 932 1095 1069 1477 924 375 116 118
MAX 2217 4041 2294 3087 2803 2802 3674 4027 3131 1947 515 1736
(WY) 1994 1986 1991 1993 2001 1998 1994 1995 1998 1993 1985 1993
MIN 0.24 3.67 2.21 1.23 13.6 165 83.8 108 17.3 2.69 0.33 0.18
(WY) 1995 1983 1990 2003 2003 2000 1986 2001 1988 1989 1996 1998

SUMMARY STATISTICS FOR 2002 CALENDAR YEAR FOR 2003 WATER YEAR WATER YEARS 1983 - 2003
ANNUAL TOTAL 298868.91 84882.14
ANNUAL MEAN 819      233      682         
HIGHEST ANNUAL MEAN 1511          1993
LOWEST ANNUAL MEAN 164          2000
HIGHEST DAILY MEAN 19600          May 12 2910          May 10 19600          May 12 2002
LOWEST DAILY MEAN 0.10     A 0.10     A 0.00     B
ANNUAL SEVEN-DAY MINIMUM 0.10     A 0.10     A 0.00     B
MAXIMUM PEAK FLOW 5940          May 10 31800      C May 12 2002
MAXIMUM PEAK STAGE 16.34     May 10 24.33     May 12 2002
INSTANTANEOUS LOW FLOW     D
10 PERCENT EXCEEDS 2630      708      2010         
50 PERCENT EXCEEDS 136      21      205         
90 PERCENT EXCEEDS 0.24 0.43 1.4      

A - Estimated, many days.

B - Many days in some years.

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

D - Minimum unknown.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data