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. WDR IL-98: 1997 (P).

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 3 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.
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 5.5 17    8.3 8.4 936  705  221  721  244  259  19    2.6  
2 5.8 14    6.7 12    1100  513  221  631  275  416  21    2.0  
3 9.0 13    8.6 9.0 1110  563  207  570  446  389  23    1.4  
4 9.1 14    12    5.5 838  707  206  518  387  279  16    1.0  
5 11    13    13    3.9 611  548  204  485  497  218  12    .76
 
6 13    12    21    e4.5 487  560  186  478  493  183  11    .54
7 11    11    23    e7.4 469  723  193  507  391  162  11    .41
8 11    10    22    e7.4 681  615  188  460  332  143  15    .35
9 9.0 12    21    e7.2 1200  503  203  398  294  127  17    .27
10 7.8 19    20    e6.9 1250  500  225  355  269  114  17    .20
 
11 7.2 13    16    e6.7 926  407  202  346  280  101  19    .17
12 6.3 17    15    e6.5 750  349  217  368  531  87  27    .31
13 5.7 19    13    e6.3 583  341  204  1340  3270  80  26    .57
14 5.9 26    12    e6.1 477  349  193  1850  6250  72  26    .42
15 5.7 22    12    e6.0 404  374  234  1410  4040  64  26    .34
 
16 4.6 17    12    e5.8 374  568  2240  1040  2070  56  27    .30
17 5.4 15    11    e6.0 345  1370  6370  964  1380  50  22    .30
18 8.3 16    7.7 e6.6 320  1310  5520  1020  1000  50  20    .30
19 7.8 11    4.6 e7.3 288  810  3140  745  757  44  16    .30
20 7.4 7.3 4.9 e8.8 260  579  2020  590  613  48  9.8 .28
 
21 6.3 8.7 6.4 e13    234  500  1560  510  515  53  7.1 .24
22 6.7 9.1 8.6 30    214  435  1500  468  465  47  5.0 .22
23 6.2 6.7 9.7 111    210  376  3240  423  431  38  5.7 .19
24 6.2 6.0 9.7 1070    207  338  2750  403  512  38  15    .18
25 6.3 7.2 9.4 1860    201  303  1750  368  476  30  13    .17
 
26 6.0 5.9 9.3 1630    195  269  1320  326  374  25  11    .18
27 7.0 8.2 9.3 1500    235  251  1080  292  320  22  8.7 .25
28 11    9.9 9.1 2410    754  246  912  271  290  22  6.9 1.2  
29 25    12    8.4 2250    ---  238  875  260  258  20  5.7 1.8  
30 32    11    7.9 1400    ---  220  856  249  228  18  4.7 .57
 
31 22    ---    8.1 1040    ---  210  ---  241  ---  19  3.5 ---     

TOTAL 291.2 383.0 359.7 13452.3 15659 15780 38237 18607 27688 3274 467.1 17.82
MEAN 9.39 12.8 11.6 434 559 509 1275 600 923 106 15.1 .59
MAX 32 26 23 2410 1250 1370 6370 1850 6250 416 27 2.6
MIN 4.6 5.9 4.6 3.9 195 210 186 241 228 18 3.5 .17
CFSM .02 .02 .02 .75 .97 .88 2.20 1.04 1.59 .18 .03 .00
IN. .02 .02 .02 .86 1.01 1.01 2.46 1.20 1.78 .21 .03 .00

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1943 - 1999, BY WATER YEAR (WY)
MEAN 138 232 341 377 498 752 823 735 560 323 126 123
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 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1943 - 1999
ANNUAL TOTAL 232348.7   134216.12
ANNUAL MEAN 637      368      418     
HIGHEST ANNUAL MEAN 1094      1993
LOWEST ANNUAL MEAN 49.7   1964
HIGHEST DAILY MEAN 8440          May 8 6370          Apr 17 12300      Dec 4 1982
LOWEST DAILY MEAN 2.0       Sep 17 .17     Sep 11, 15 .00 A
ANNUAL SEVEN-DAY MINIMUM 4.3       Sep 14 .20     Sep 21 .00 Jul 1 1988
INSTANTANEOUS PEAK FLOW 6870          Apr 17 13100      Dec 4 1982
INSTANTANEOUS PEAK STAGE 13.35     Apr 17 19.16 Dec 4 1982
INSTANTANEOUS LOW FLOW .12     B
ANNUAL RUNOFF (CFSM) 1.10 .64 .72
ANNUAL RUNOFF (INCHES) 14.93 8.62 9.81
10 PERCENT EXCEEDS 1510      1010      1060     
50 PERCENT EXCEEDS 214      38      134     
90 PERCENT EXCEEDS 7.4   4.8   6.8  
A - Many days in 1953, 1983-84, 1986-91.
B - Sept. 10, 11, 23, 25, 26


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data