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
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 2.1   e.10 57    2.4 3020  5070  458    2.3   168    9.4 4.1 17   
2 2.2   .11 133    21    2750  3760  290    1.5   91    9.2 18    10   
3 2.3   e.10 140    60    2440  2970  446    1.4   80    15    5.2 6.3
4 6.5   e.10 128    70    2240  2240  500    1.3   382    7.8 4.4 5.5
5 58      .24 138    72    2120  1510  294    1.4   747    59    3.8 4.4
 
6 502      300      185    71    1350  1580  338    1.5   4880    85    3.6 16   
7 804      693      230    71    1570  1270  343    .82 3530    12    3.7 8.2
8 162      383      209    149    1880  842  420    .41 2150    7.4 3.6 3.5
9 12      347      185    226    2000  617  323    70      1410    49    3.7 9.4
10 2.0   567      186    183    2340  656  525    131      1400    26    3.6 3.4
 
11 110      569      206    109    2420  735  3340    239      822    7.5 3.6 2.7
12 123      565      207    71    2400  688  553    221      1030    5.6 3.7 2.4
13 6.1   880      205    66    e3500  620  366    199      966    11    3.9 2.0
14 1.5   1070      331    71    e2900  835  1060    61      578    26    3.8 2.3
15 181      1030      449    83    e2600  828  757    2.4   447    9.1 3.7 2.1
 
16 428      915      452    165    2680  505  435    1.0   429    6.1 5.4 2.1
17 344      882      449    316    2630  80  408    .71 415    4.9 3.2 2.2
18 137      845      318    426    2280  1360  311    45      340    6.9 31    6.7
19 6.8   642      195    379    1600  1660  289    115      270    4.6 11    3.3
20 15      339      187    291    1400  958  500    120      44    4.3 3.9 2.3
 
21 1.6   370      186    284    1250  1270  553    196      222    4.0 3.3 3.5
22 e.10 481      184    283    747  1220  1000    273      363    4.0 3.3 2.1
23 7.0   326      183    282    725  948  134    230      377    4.0 15    1.7
24 1.4   192      183    281    1710  797  98    101      376    3.7 12    1.4
25 e.10 104      181    278    7150  701  15    27      375    4.1 5.2 1.4
 
26 e.10 60      148    279    7840  473  5.0 27      371    4.3 3.7 1.3
27 e.10 376      149    278    6630  368  258    267      197    3.6 3.2 1.2
28 e.10 568      112    145    6320  633  865    343      24    6.1 2.3 9.7
29 .11 518      16    122    ---  571  378    253      12    15    3.2 5.6
30 .40 61      3.2 1430    ---  525  30    176      9.8 4.0 93    1.4
 
31 e.10 ---      2.6 2650    ---  481  ---    230      ---    3.9 109    ---   

TOTAL 2916.61 13083.65 5937.8 9214.4 78492 36771 15292.0 3338.74 22505.8 422.5 380.1 141.1
MEAN 94.1 436 192 297 2803 1186 510 108 750 13.6 12.3 4.70
MAX 804 1070 452 2650 7840 5070 3340 343 4880 85 109 17
MIN .10 .10 2.6 2.4 725 80 5.0 .41 9.8 3.6 2.3 1.2
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1983 - 2001, BY WATER YEAR (WY)
MEAN 227 568 784 662 933 1133 1095 1401 926 379 111 118
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 .24 3.67 2.21 1.79 21.9 165 83.8 108 17.3 2.69 .33 .18
(WY) 1995 1983 1990 2000 2000 2000 1986 2001 1988 1989 1996 1998

SUMMARY STATISTICS FOR 2000 CALENDAR YEAR FOR 2001 WATER YEAR WATER YEARS 1983 - 2001
ANNUAL TOTAL 81376.34 188495.70
ANNUAL MEAN 222      516      693         
HIGHEST ANNUAL MEAN 1511          1993
LOWEST ANNUAL MEAN 164          2000
HIGHEST DAILY MEAN 2360          Jul 5 7840          Feb 26 16400          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 FLOW 9020          Feb 25 17100      C Apr 15 1994
MAXIMUM PEAK STAGE 17.85     Feb 25 23.04 D May 2 1983
INSTANTANEOUS LOW FLOW     E
10 PERCENT EXCEEDS 623      1420      2040         
50 PERCENT EXCEEDS 61      149      216         
90 PERCENT EXCEEDS 1.1   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