Station list     Available data
ROCK RIVER BASIN


05448000       MILL CREEK AT MILAN, IL



LOCATION.-- Lat 41°26'32", long 90°33'21", in NW1/4NE1/4 sec.25, T.17 N., R.2 W., Rock Island County, Hydrologic Unit 07090005, on right bank at upstream side of Knoxville Road Bridge, 1 mi southeast of Milan, and at mile 1.2.

DRAINAGE AREA.-- 62.4 mi2.

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

DISCHARGE: March 1989 to current year. October 1939 to September 1940 (fragmentary), July 1941 to September 1986. Seven-month period (March to September), water years 1987-89.

 

STAGE: Water years 1999-2001.


REVISED RECORDS.-- WSP 1308: 1940(M), 1943(M). WDR IL-72-1: Drainage area.

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 565.23 ft above sea level (levels by U.S. Army Corps of Engineers). Prior to Oct. 1, 1987, at datum 1.00 ft higher. Prior to Apr. 5, 1940, nonrecording gage at site 300 ft upstream. Oct. 1939 to Nov. 15, 1984, recording gage at site 400 ft. upstream.

REMARKS.-- Occasional pumpage of about 1 ft3/s from quarry into creek upstream from gage.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 9,300 ft3/s, Apr. 22, 1973, gage height, 12.65 ft, present datum; no flow at times in several years.

REMARKS FOR CURRENT YEAR.-- Records good except those for Jan. 23 to Mar. 28 and May 12 to June 9, which are fair, and those for estimated daily disharges, which are poor.
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001
DAILY MEAN VALUES
DAYOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEP
 
19.814 e9.7e8.6e110 134 53 60 297 34 14   3.0
29.613 e9.4e8.8e90 121 49 56 207 32 19   2.9
313   12 e9.2e8.9e80 e110 47 51 163 35 19   2.8
4184   11 e9.0e9.0e68 e100 46 78 141 80 13   3.9
5e53   12 e8.8e9.1e58 e90 50 87 783 37 11   4.9
 
633   19 e9.5e9.1e52 86 103 148 413 32 9.73.9
724   33 e11   e9.2e50 81 134 205 283 30 9.115   
821   19 e11   e9.2e60 76 89 161 228 41 9.47.1
919   31 e10   e9.31650 69 86 123 186 40 10   9.3
1018   36 e9.5e9.3400 69 75 117 156 31 8.512   
 
1117   24 e9.0e9.2216 93 82 440 137 27 6.65.4
1216   22 e11   e9.0163 92 94 212 123 25 6.45.2
1315   20 e19   e9.0141 94 71 158 115 25 5.95.8
1415   19 e18   e9.5208 78 67 794 212 24 5.34.9
1515   18 e16   e13   196 157 240 289 251 21 6.32.8
 
1616   19 e14   e17   139 264 205 180 133 20 12   2.7
1716   16 e13   e27   105 179 143 213 102 19 8.42.7
1814   14 e12   e24   e100 177 116 172 86 27 16   7.0
1913   e12 e11   e21   e92 192 101 134 70 23 25   32   
2013   e11 e10   e19   e86 190 90 200 64 21 11   12   
 
2113   e11 e9.5e17   e81 163 83 691 69 43 8.87.2
2213   e11 e9.0e16   e77 137 159 283 64 29 7.35.7
2313   e12 e8.5e15   e74 120 153 221 56 23 6.411   
2415   e12 e8.2e14   1110 100 107 182 51 25 7.212   
2516   e12 e8.0e13   1260 87 103 159 46 23 7.07.3
 
2614   e12 e7.8e13   282 77 89 318 44 19 6.44.9
2713   e12 e7.8e12   215 72 78 258 41 17 6.35.1
2813   e11 e8.0e12   155 68 71 187 40 16 6.14.6
2913   e11 e8.2e12   --- 66 66 156 39 16 4.23.6
3013   e10 e8.3e150   --- 62 63 135 36 15 4.63.4
 
3114   --- e8.4e140   --- 56 --- 179 --- 15 5.5---   

TOTAL684.4489321.8662.273183460291366474636865295.4210.1
MEAN22.116.310.421.426111297.121415527.99.537.00
MAX18436191501650264240794783802532
MIN9.6107.88.65056465136154.22.7
CFSM.35.26.17.344.191.791.563.442.48.45.15.11
IN..41.29.19.394.362.061.743.962.76.52.18.13

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2001, BY WATER YEAR (WY)
MEAN22.824.226.738.464.677.079.374.470.041.524.719.0
MAX209175162223261299335432616388259208
(WY)195519621983196020011960196519961993198619931970
MIN.11.51.44.0002.783.953.173.441.861.50.89.18
(WY)195719571977194019641956195619561956198819571956

SUMMARY STATISTICSFOR 2000 CALENDAR YEARFOR 2001 WATER YEARWATER YEARS 1940 - 2001
ANNUAL TOTAL17489.9      28501.9      
ANNUAL MEAN47.8      78.1      48.3      
HIGHEST ANNUAL MEAN173         1993
LOWEST ANNUAL MEAN8.67    1957
HIGHEST DAILY MEAN1150      A    Apr 201650             Feb 95000         Jul 8 1986
LOWEST DAILY MEAN3.2          B2.7          Sep 16, 17.00    C
ANNUAL SEVEN-DAY MINIMUM3.3          Jan 253.8          Aug 29.00    Dec 30 1939
MAXIMUM PEAK FLOW3680      D    Feb 259300         Apr 22 1973
MAXIMUM PEAK STAGE8.60 E    Feb 912.65 FApr 22 1973
INSTANTANEOUS LOW FLOW1.6          Sep 18
ANNUAL RUNOFF (CFSM).77    1.25    .77    
ANNUAL RUNOFF (INCHES)10.43    16.99    10.51    
10 PERCENT EXCEEDS101         185         94         
50 PERCENT EXCEEDS22         23         17         
90 PERCENT EXCEEDS7.3      7.3      1.7      

A - Estimated on basis of graphic reconstruction.
B - Jan. 28, 29, estimated due to backwater from ice.
C - At times in several years.
D - Gage height, 8.20 ft.
E - Ice jam.
F - Present datum.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data