Station list     Available data
ILLINOIS RIVER BASIN


05568000       MACKINAW RIVER NEAR GREEN VALLEY, IL



LOCATION.-- Lat 40°27'15", long 89°36'22", in SE1/4SE1/4 sec.12, T.23 N., R.5 W., Tazewell County, Hydrologic Unit 07130004, on right downstream side of bridge on Towerline Road, 2.5 mi east of State Highway 29, 3.9 mi northeast of Green Valley, 5.8 mi south of Pekin, 10.2 mi north of U.S. Highway 136, and at mile 17.3.

DRAINAGE AREA.-- 1,073 mi2. Area at site used prior to Oct. 1, 1988, 1,089 mi2.

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
 

DISCHARGE: March 1921 to October 1956; October 1988 to current year.
 

STAGE: Water years 1994-2000.
 

PARTIAL RECORD: Annual maximum, water years 1957-88.
SURFACE-WATER QUALITY
 

CHEMICAL: October 1997 to September 1998.
 

SEDIMENT: October 1994 to September 1997.
 

MISCELLANEOUS: Contaminants of streambed sediment, July 1997; contaminants of fish tissue, July 1997; streambank sediment size, October 1997; Streambed sediment size, October 1997.
BIOLOGICAL: Benthic macroinvertebrates, September 1996; fish, July 1997.

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter and rain gage, and crest-stage gage. Datum of gage is 477.10 ft above sea level (levels by U.S. Army Corps of Engineers). Prior to Jan. 17, 1933, chain gage at site 3.5 mi downstream on railroad bridge at datum 2.00 ft higher. Jan. 17, 1933, to May 13, 1940, chain gage, and May 14, 1940 to Sept. 30, 1952, wire-weight gage at site 3.6 mi downstream at datum 2.00 ft higher. Oct. 1, 1952 to Oct. 31, 1956, wire-weight gage, and Nov. 1, 1956 to Sept. 30, 1988, crest-stage gage at site 3.6 mi down stream at present datum.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 51,000 ft3/s, Dec. 6, 1982, gage height, 16.13 ft (backwater from ice), site then in use; maximum recorded gage height, 28.29 ft, Sept. 16, 1993 (discharge unknown); minimum discharge observed, 17 ft3/s, Oct. 26, 27, 1940.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 6,160 mg/L, May 27, 1996; minimum daily, 4 mg/L, May 11, 1997.
SUSPENDED-SEDIMENT LOADS: Maximum daily 99,800 tons, May 27, 1996; minimum daily, 0.83 tons, Dec. 21, 1996.

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated discharges, which are poor.
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 51  38  36  38  38  e80  76  157  793  441  96  46 
2 52  41  36  39  40  e86  75  163  654  386  87  43 
3 56  37  38  39  43  e76  75  151  550  379  81  40 
4 81  36  39  40  44  e69  71  155  492  358  77  37 
5 63  36  70  38  47  e65  67  150  482  499  84  34 
 
6 57  34  82  38  51  e63  65  144  427  429  97  34 
7 56  34  69  37  56  e62  67  138  385  457  78  35 
8 55  34  74  39  58  61  81  133  345  415  74  35 
9 53  35  65  41  59  59  71  251  315  336  74  34 
10 51  37  58  43  e60  55  66  255  294  299  69  33 
 
11 47  36  53  44  e62  53  68  248  282  294  65  32 
12 45  36  50  41  e64  52  70  229  272  278  62  34 
13 44  36  47  40  e62  51  67  318  299  252  59  45 
14 42  36  45  38  e60  50  67  260  291  226  57  33 
15 41  39  46  38  e60  51  66  218  330  204  56  33 
 
16 41  38  48  37  e62  54  65  187  290  184  54  32 
17 40  36  45  36  e66  58  66  174  315  170  55  32 
18 39  36  43  36  e70  54  67  170  287  157  54  31 
19 38  36  43  36  e80  68  68  392  246  155  50  30 
20 38  36  43  37  e100  148  85  659  312  144  48  33 
 
21 38  36  39  e43  e94  155  165  631  1100  132  46  36 
22 38  36  40  e42  e90  132  246  469  884  122  46  37 
23 37  38  38  e39  e100  128  378  411  1060  111  51  34 
24 37  42  38  e37  e120  125  307  345  1220  102  49  43 
25 36  40  38  e35  e150  120  263  288  1270  95  49  47 
 
26 36  37  38  e34  e120  105  230  248  1120  89  49  44 
27 36  36  36  e33  e100  109  211  2000  885  85  48  41 
28 36  36  36  e32  e93  100  194  2260  699  81  46  41 
29 36  37  37  e31  e86  89  177  1740  582  81  46  39 
30 35  37  38  e33  ---  83  164  1260  501  95  45  37 
 
31 35  ---  38  e35  ---  79  ---  973  ---  124  43  --- 

TOTAL 1390 1102 1446 1169 2135 2540 3738 15177 16982 7180 1895 1105
MEAN 44.8 36.7 46.6 37.7 73.6 81.9 125 490 566 232 61.1 36.8
MAX 81 42 82 44 150 155 378 2260 1270 499 97 47
MIN 35 34 36 31 38 50 65 133 246 81 43 30
CFSM .04 .03 .04 .04 .07 .08 .12 .46 .53 .22 .06 .03
IN. .05 .04 .05 .04 .07 .09 .13 .53 .59 .25 .07 .04

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1921 - 2000, BY WATER YEAR (WY)
MEAN 299 416 457 705 944 1083 1329 1291 870 566 281 352
MAX 3525 3417 2425 3514 3066 3629 4996 5756 2704 3109 2404 6057
(WY) 1927 1927 1928 1993 1927 1993 1944 1943 1999 1951 1924 1993
MIN 19.8 21.8 26.3 29.6 34.1 49.3 68.8 79.9 53.2 37.1 28.6 23.7
(WY) 1941 1941 1941 1940 1931 1931 1931 1934 1934 1988 1988 1940

SUMMARY STATISTICS FOR 1999 CALENDAR YEAR FOR 2000 WATER YEAR WATER YEARS 1921 - 2000
ANNUAL TOTAL 299145      55859     
ANNUAL MEAN 820      153      719         
HIGHEST ANNUAL MEAN 2353          1993
LOWEST ANNUAL MEAN 98.4       1940
HIGHEST DAILY MEAN 10500          Jun 16 2260          May 28 23500          Apr 24 1944
LOWEST DAILY MEAN 34          A 30          Sep 19 17          B
ANNUAL SEVEN-DAY MINIMUM 35          Nov 3 32          Sep 14 18          Oct 21 1940
INSTANTANEOUS PEAK FLOW 2900          May 27 51000      C Dec 6 1982
INSTANTANEOUS PEAK STAGE 18.83     May 27  D Sep 16 1993
INSTANTANEOUS LOW FLOW 29          Sep 18, 19 17      E B
ANNUAL RUNOFF (CFSM) .76 .14 .67    
ANNUAL RUNOFF (INCHES) 10.37 1.94 9.11    
10 PERCENT EXCEEDS 2090      349      1780         
50 PERCENT EXCEEDS 264      59      252         
90 PERCENT EXCEEDS 37      36      44         
A - Jan. 14 & 15, estimated due to backwater from ice, Nov. 6-8.
B - Oct. 26, 27, 1940.
 C - Gage height, 16.13 ft, backwater from ice, site then in use.
 D - Maximum recorded, 28.29 ft; discharge unknown.
 E - Observed.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data