Station list     Available data
ILLINOIS RIVER BASIN


05554500                   VERMILION RIVER AT PONTIAC, IL



LOCATION.--Lat 40°52'40", long 88°38'10", in SE1/4SW1/4 sec.22, T.28 N., R.5 E., Livingston County, Hydrologic Unit 07130002, near center of span on downstream side of bridge on Vermilion Street in Pontiac, 0.1 mi upstream from State Highway 116, 0.8 mi upstream from Turtle Creek, and at mile 60.3.

DRAINAGE AREA.--579 mi2.

PERIOD OF RECORD.--October 1942 to current year.

REVISED RECORDS.--WDR IL-75-1: Drainage area. WDR IL-83-2: 1951, 1957, 1965(M), 1968, 1970, 1980.

GAGE.--Water-stage recorder. Datum of gage is 619.45 ft above sea level. Prior to Nov. 8, 1965, nonrecording gage at same site and datum.

REMARKS.--Records good except those for estimated daily discharges, which are poor. An average of 1.4 ft3/s, diverted 0.5 mi upstream from station for water supply of city of Pontiac, is not included in records. U.S. Army Corps of Engineers satellite telemeter at station.

REVISIONS.--The following peaks above base discharge of 2500 ft3/s for Feb. 21 and Feb. 27 were not published for the water-year 1997.

Date

Time

Discharge

Gage Height

Feb. 21

Unknown

8100e

Unknown

Feb. 27

Unknown

6400e

Unknown
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 .30 12    59  63  608  523  945  5310  323  876  71  13   
2 .19 13    46  61  715  455  1040  4120  271  570  62  12   
3 .20 13    34  63  657  414  896  2660  250  394  54  14   
4 .26 13    26  78  538  378  770  2170  227  510  51  16   
5 .24 13    21  180  457  332  658  1820  214  981  53  13   
 
6 .23 16    20  566  382  294  593  3280  198  2850  65  12   
7 .23 16    20  783  330  281  569  6130  182  6300  57  12   
8 .25 16    19  1200  295  381  673  8440  173  5530  52  11   
9 .43 16    19  2540  268  2170  709  8270  233  3030  49  11   
10 .23 15    20  2070  252  2950  607  5990  443  1520  46  10   
 
11 .26 15    21  1230  402  2170  519  3280  1660  957  41  8.5
12 .35 10    21  815  1440  1510  478  2010  5420  674  36  8.0
13 .91 9.6 21  579  1350  1140  467  1460  4170  515  33  9.1
14 .36 8.3 19  346  926  1000  478  1110  2350  406  30  7.8
15 .20 9.2 18  430  683  958  484  919  1670  328  27  3.4
 
16 .19 10    17  399  575  890  464  765  1340  271  27  2.3
17 .25 11    17  320  553  1400  480  642  1400  229  25  2.0
18 .38 8.3 17  261  925  5420  398  555  1150  200  26  3.6
19 .93 6.4 17  e232  1140  5980  352  503  1100  176  26  5.4
20 1.8   6.3 18  e212  933  4200  345  540  1070  186  23  5.7
 
21 1.9   6.2 20  e208  742  3590  570  558  816  210  21  8.7
22 3.0   6.8 24  198  608  4740  848  475  633  260  19  11   
23 5.5   6.5 27  181  536  3940  657  443  538  409  18  8.1
24 5.4   6.7 39  166  486  2590  539  484  470  331  16  12   
25 6.3   6.5 68  151  440  1830  474  459  412  211  13  10   
 
26 9.8   4.7 149  139  408  1430  430  392  365  159  14  6.4
27 13      9.0 155  131  452  1160  376  344  323  131  13  6.1
28 16      21    100  132  567  1030  313  312  284  113  13  4.7
29 14      38    99  191  ---  1110  309  294  267  100  14  5.0
30 12      65    76  381  ---  994  3390  400  536  88  14  6.0
 
31 11      ---    68  472  ---  879  ---  402  ---  78  14  ---   

TOTAL 106.09 407.5 1295 14778 17668 56139 19831 64537 28488 28593 1023 257.8
MEAN 3.42 13.6 41.8 477 631 1811 661 2082 950 922 33.0 8.59
MAX 16 65 155 2540 1440 5980 3390 8440 5420 6300 71 16
MIN .19 4.7 17 61 252 281 309 294 173 78 13 2.0
CFSM .01 .02 .07 .82 1.09 3.13 1.14 3.60 1.64 1.59 .06 .01
IN. .01 .03 .08 .95 1.14 3.61 1.27 4.15 1.83 1.84 .07 .02

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1943 - 1998, BY WATER YEAR (WY)
MEAN 140 236 347 376 497 757 815 737 553 327 128 125
MAX 1682 2327 2773 1981 1758 3123 2801 2968 2232 2350 1186 1540
(WY) 1994 1986 1983 1993 1997 1979 1957 1943 1980 1951 1943 1989
MIN .000 1.46 4.58 3.03 6.71 23.7 109 71.1 27.0 .000 .000 .000
(WY) 1989 1954 1954 1977 1963 1964 1977 1964 1988 1988 1988 1988

SUMMARY STATISTICS FOR 1997 CALENDAR YEAR FOR 1998 WATER YEAR WATER YEARS 1943 - 1998
ANNUAL TOTAL 134338.39     233123.39
ANNUAL MEAN 368          639      419     
HIGHEST ANNUAL MEAN 1094      1993
LOWEST ANNUAL MEAN 49.7   1964
HIGHEST DAILY MEAN 7800      A     Feb 21 8440          May 8 12300      Dec 4 1982
LOWEST DAILY MEAN .19         Oct 2, 16 .19     Oct 2, 16 .00 B
ANNUAL SEVEN-DAY MINIMUM .23         Oct 2 .23     Oct 2 .00 Jul 1 1988
INSTANTANEOUS PEAK FLOW 8940          May 8 13100      Dec 4 1982
INSTANTANEOUS PEAK STAGE 16.19     May 8 19.16 Dec 4 1982
INSTANTANEOUS LOW FLOW .16     Oct 2
ANNUAL RUNOFF (CFSM) .64     1.10 .72
ANNUAL RUNOFF (INCHES) 8.63     14.98 9.84
10 PERCENT EXCEEDS 830          1510      1070     
50 PERCENT EXCEEDS 114          214      134     
90 PERCENT EXCEEDS 8.3       6.3   6.9  
A - Estimated.
B - Many days in 1953, 1983-84, 1986-91.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data