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.--October 1982 to current year.

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

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

REMARKS.--Records fair except those for estimated daily discharges, which are poor. Flow regulated by Lake Decatur Dam, 1.2 mi upstream. Gage-height telemeter at station.
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 3.0 4.5 5.0   1.3 1290  482  221  901  429  568    5.7 2.5
2 2.6 4.9 4.4   3.6 1250  556  253  835  1690  565    4.7 2.7
3 2.3 38    4.1   2.9 1390  616  324  587  1400  486    4.2 2.7
4 2.5 57    4.0   1.9 1160  819  399  477  1010  480    3.7 2.6
5 9.1 41    4.0   1.4 1130  832  569  730  2120  475    3.3 2.5
 
6 33    30    4.8   1.3 1050  642  640  865  2050  282    3.2 2.4
7 8.7 22    8.6   1.2 1610  657  601  608  1320  270    5.9 2.4
8 3.3 17    9.1   1.3 2550  772  599  527  1240  350    4.3 2.4
9 2.0 16    9.0   1.4 2270  762  709  540  1310  163    3.2 2.3
10 1.7 38    16      1.2 2070  757  726  608  708  50    3.2 2.3
 
11 1.5 39    8.8   1.1 1800  702  694  581  763  64    3.0 2.6
12 1.4 29    5.1   e1.1 1890  600  693  472  1110  68    11    3.1
13 1.3 22    3.5   e1.1 1920  613  682  911  2190  29    1110    2.7
14 1.3 18    2.6   e1.0 1520  626  657  941  2670  15    1330    2.4
15 1.5 14    2.1   e1.0 938  617  835  866  2110  14    459    2.3
 
16 1.9 11    1.9   e1.0 785  617  1910  1080  1580  23    100    2.4
17 3.3 9.2 1.8   e2.0 884  695  3320  745  1220  199    33    2.5
18 11    8.1 1.7   e4.0 775  755  3070  483  1100  285    16    2.6
19 15    7.7 2.9   e9.0 704  667  2990  662  978  52    8.8 2.6
20 14    6.7 2.6   e10    626  591  3360  651  658  21    6.8 2.6
 
21 14    5.9 3.2   e20    615  583  4040  511  458  12    6.1 2.5
22 10    5.7 2.5   321    497  550  3140  453  508  7.8 5.9 2.7
23 8.0 5.7 1.9   2050    435  492  2350  587  589  5.7 15    2.7
24 6.9 5.1 1.6   3170    442  474  1460  534  555  4.9 18    2.8
25 6.6 5.0 1.4   2940    460  457  1270  475  860  4.5 6.0 3.2
 
26 7.4 5.0 1.3   2770    475  424  922  524  1290  4.7 4.0 3.2
27 11    4.7 1.3   2980    441  390  949  445  935  275    4.1 3.1
28 33    4.6 1.3   2780    442  386  1180  363  838  202    3.2 26   
29 42    4.9 1.1   1950    ---  245  1150  382  786  40    3.1 26   
30 35    5.6 .99 1280    ---  99  990  383  732  15    2.7 7.1
 
31 12    ---    1.1   1640    ---  185  ---  383  ---  7.8 2.6 ---   

TOTAL 306.3 485.3 119.69 21949.8 31419 17663 40703 19110 35207 5038.4 3189.7 129.9
MEAN 9.88 16.2 3.86 708 1122 570 1357 616 1174 163 103 4.33
MAX 42 57 16 3170 2550 832 4040 1080 2670 568 1330 26
MIN 1.3 4.5 .99 1.0 435 99 221 363 429 4.5 2.6 2.3

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1983 - 1999, BY WATER YEAR (WY)
MEAN 247 608 865 722 879 1187 1184 1537 948 394 122 131
MAX 2217 4041 2294 3087 2230 2802 3674 4027 3131 1947 515 1736
(WY) 1994 1986 1991 1993 1984 1998 1994 1995 1998 1993 1985 1993
MIN .24 3.67 2.21 26.8 56.0 180 83.8 129 17.3 2.69 .33 .18
(WY) 1995 1983 1990 1990 1989 1996 1986 1988 1988 1989 1996 1998

SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1983 - 1999
ANNUAL TOTAL 387382.18 175321.09
ANNUAL MEAN 1061      480      735         
HIGHEST ANNUAL MEAN 1511          1993
LOWEST ANNUAL MEAN 337          1989
HIGHEST DAILY MEAN 8110          Jun 19 4040          Apr 21 16400          Apr 15 1994
LOWEST DAILY MEAN .00     A .99     Dec 30 .00     B
ANNUAL SEVEN-DAY MINIMUM .00     Sep 1 1.1       Jan 10 .00     Oct 8 1988
INSTANTANEOUS PEAK FLOW 5040          Apr 21 17100      C Apr 15 1994
INSTANTANEOUS PEAK STAGE 15.62     Apr 21 23.04 D May 2 1983
INSTANTANEOUS LOW FLOW .76     Dec 30
10 PERCENT EXCEEDS 3240      1310      2100         
50 PERCENT EXCEEDS 410      42      251         
90 PERCENT EXCEEDS 1.3   2.2   1.6      
A - Many days.
B - Many days in most years.
C - Gage height, 21.12 ft.
D - Discharge, 12,400 ft3/s.


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Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data