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
DAYOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEP
 
13.04.55.0  1.31290 482 221 901 429 568   5.72.5
22.64.94.4  3.61250 556 253 835 1690 565   4.72.7
32.338   4.1  2.91390 616 324 587 1400 486   4.22.7
42.557   4.0  1.91160 819 399 477 1010 480   3.72.6
59.141   4.0  1.41130 832 569 730 2120 475   3.32.5
 
633   30   4.8  1.31050 642 640 865 2050 282   3.22.4
78.722   8.6  1.21610 657 601 608 1320 270   5.92.4
83.317   9.1  1.32550 772 599 527 1240 350   4.32.4
92.016   9.0  1.42270 762 709 540 1310 163   3.22.3
101.738   16     1.22070 757 726 608 708 50   3.22.3
 
111.539   8.8  1.11800 702 694 581 763 64   3.02.6
121.429   5.1  e1.11890 600 693 472 1110 68   11   3.1
131.322   3.5  e1.11920 613 682 911 2190 29   1110   2.7
141.318   2.6  e1.01520 626 657 941 2670 15   1330   2.4
151.514   2.1  e1.0938 617 835 866 2110 14   459   2.3
 
161.911   1.9  e1.0785 617 1910 1080 1580 23   100   2.4
173.39.21.8  e2.0884 695 3320 745 1220 199   33   2.5
1811   8.11.7  e4.0775 755 3070 483 1100 285   16   2.6
1915   7.72.9  e9.0704 667 2990 662 978 52   8.82.6
2014   6.72.6  e10   626 591 3360 651 658 21   6.82.6
 
2114   5.93.2  e20   615 583 4040 511 458 12   6.12.5
2210   5.72.5  321   497 550 3140 453 508 7.85.92.7
238.05.71.9  2050   435 492 2350 587 589 5.715   2.7
246.95.11.6  3170   442 474 1460 534 555 4.918   2.8
256.65.01.4  2940   460 457 1270 475 860 4.56.03.2
 
267.45.01.3  2770   475 424 922 524 1290 4.74.03.2
2711   4.71.3  2980   441 390 949 445 935 275   4.13.1
2833   4.61.3  2780   442 386 1180 363 838 202   3.226   
2942   4.91.1  1950   --- 245 1150 382 786 40   3.126   
3035   5.6.991280   --- 99 990 383 732 15   2.77.1
 
3112   ---   1.1  1640   --- 185 --- 383 --- 7.82.6---   

TOTAL306.3485.3119.6921949.831419176634070319110352075038.43189.7129.9
MEAN9.8816.23.867081122570135761611741631034.33
MAX42571631702550832404010802670568133026
MIN1.34.5.991.0435992213634294.52.62.3

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1983 - 1999, BY WATER YEAR (WY)
MEAN247608865722879118711841537948394122131
MAX22174041229430872230280236744027313119475151736
(WY)199419861991199319841998199419951998199319851993
MIN.243.672.2126.856.018083.812917.32.69.33.18
(WY)199519831990199019891996198619881988198919961998

SUMMARY STATISTICSFOR 1998 CALENDAR YEARFOR 1999 WATER YEARWATER YEARS 1983 - 1999
ANNUAL TOTAL387382.18175321.09
ANNUAL MEAN1061     480     735         
HIGHEST ANNUAL MEAN1511         1993
LOWEST ANNUAL MEAN337         1989
HIGHEST DAILY MEAN8110         Jun 194040         Apr 2116400         Apr 15 1994
LOWEST DAILY MEAN.00    A.99    Dec 30.00    B
ANNUAL SEVEN-DAY MINIMUM.00    Sep 11.1      Jan 10.00    Oct 8 1988
INSTANTANEOUS PEAK FLOW5040         Apr 2117100      CApr 15 1994
INSTANTANEOUS PEAK STAGE15.62    Apr 2123.04 DMay 2 1983
INSTANTANEOUS LOW FLOW.76    Dec 30
10 PERCENT EXCEEDS3240     1310     2100         
50 PERCENT EXCEEDS410     42     251         
90 PERCENT EXCEEDS1.3  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.

Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data