Station list     Available data
ROCK RIVER BASIN


05444000       ELKHORN CREEK NEAR PENROSE, IL

 

LOCATION.-- Lat 41°54'10", long 89°41'46" (NAD of 1927), in SW1/4SE1/4 sec.9, T.22 N., R.7 E., Whiteside County, Hydrologic Unit 07090005, on left bank 50 ft upstream from bridge on County Road 2200 N, 2 mi northwest of Penrose, 2.2 mi downstream from Buffalo Creek, 5 mi upstream from Sugar Creek, and at mile 17.5.

 

DRAINAGE AREA.-- 146 mi2.

 

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

 

DISCHARGE: October 1939 to current year.

 

STAGE: Water years 1994-2002.

SURFACE-WATER QUALITY

 

CHEMICAL: Water years 1979-91.

 

REVISED RECORDS.-- WSP 925: 1940. WSP 955: 1941. WSP 1175: 1941(P), 1948(P). WSP 1308: 1950(M). WDR IL-72-1: Drainage area.

 

GAGE.-- Water-stage recorder and phone telemeter. Datum of gage is 657.85 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers). Prior to Apr. 6, 1940, nonrecording gage at same site and datum.

 

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 7,330 ft3/s, June 4, 2002, gage height, 17.42 ft; maximum gage height, 17.75 ft, Jan. 5, 1946; minimum discharge, 1.9 ft3/s, Jan. 3, 1976, result of freezeup.

 

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Flood of June 1938 reached a stage of 19.6 ft, from U.S. Army Corps of Engineers high-water mark.

 

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor.

DISCHARGE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002
DAILY MEAN VALUES
DAYOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEP
 
168 115 93 e82 72 112 102 130 107 131 93 73 
266 109 89 e82 63 113 103 132 105 128 90 78 
364 103 90 e81 67 106 98 126 152 126 88 76 
466 100 88 e80 63 200 95 123 e4460 123 87 71 
575 97 88 e79 e64 125 94 121 e3780 119 88 69 
 
669 96 88 e78 e68 105 93 122 664 127 86 68 
765 95 87 e78 67 101 110 119 427 129 83 68 
864 93 85 77 65 148 185 117 345 124 82 67 
963 89 83 80 68 274 402 122 298 224 81 68 
1067 90 82 79 87 204 274 112 269 143 80 68 
 
1170 87 81 76 96 182 219 128 259 128 79 68 
1268 85 82 75 85 159 193 180 241 122 80 68 
1371 87 94 75 80 150 175 166 224 118 87 65 
1479 94 95 75 78 143 165 153 215 115 84 65 
1577 89 90 73 78 138 159 144 205 111 81 65 
 
1673 85 91 72 78 128 150 144 191 109 79 64 
1769 82 94 69 75 124 144 142 180 110 79 64 
1868 81 94 73 74 122 139 135 172 111 76 65 
1968 82 93 e68 85 118 144 131 165 108 76 70 
2067 79 89 e70 151 118 138 128 161 106 75 69 
 
2165 79 87 73 231 112 140 125 156 107 75 66 
2269 79 89 70 170 103 142 124 152 104 146 63 
23472 78 92 74 151 113 138 125 148 100 142 61 
24282 95 77 71 141 108 139 122 144 98 106 61 
25256 115 e87 69 133 103 134 124 141 97 90 61 
 
26188 104 e85 69 126 100 128 121 148 98 83 62 
27157 101 e83 69 117 100 132 116 186 104 80 62 
28141 97 e82 69 115 101 145 114 147 102 77 61 
29130 96 e83 68 --- 106 136 112 140 107 76 61 
30123 96 e84 67 --- 104 133 130 136 101 75 60 
 
31120 --- e84 70 --- 100 --- 111 --- 95 74 --- 

TOTAL3380277827092291274840204549399914118362526781987
MEAN109.092.6087.3973.9098.14129.7151.6129.0470.6116.986.3966.23
MAX4721159582231274402180446022414678
MIN637877676310093111105957460
CFSM0.750.630.600.510.670.891.040.883.220.800.590.45
IN.0.860.710.690.580.701.021.161.023.600.920.680.51

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2002, BY WATER YEAR (WY)
MEAN67.0172.5674.6597.57153.2179.3128.2128.7145.994.4875.5367.47
MAX280314267580556588618607560401422225
(WY)198219861973196919511993197319741993195119721972
MIN15.617.615.414.622.333.634.725.725.819.223.014.7
(WY)195819501959195919641956195719401957194019631957

SUMMARY STATISTICSFOR 2001 CALENDAR YEARFOR 2002 WATER YEARWATER YEARS 1940 - 2002
ANNUAL TOTAL44263     48882         
ANNUAL MEAN121.3  133.9      106.7      
HIGHEST ANNUAL MEAN275         1973
LOWEST ANNUAL MEAN30.7      1940
HIGHEST DAILY MEAN2170         Feb 254460      A    Jun 45430         Apr 21 1973
LOWEST DAILY MEAN50         B60             Sep 3010         Dec 10 1958
ANNUAL SEVEN-DAY MINIMUM51         Jan 2161             Sep 2410         Dec 9 1958
MAXIMUM PEAK FLOW7330             Jun 47330      CJun 4 2002
MAXIMUM PEAK STAGE17.42        Jun 417.75 DJan 5 1946
INSTANTANEOUS LOW FLOW27             Feb 41.9   EJan 3 1976
ANNUAL RUNOFF (CFSM)0.830.92    0.73    
ANNUAL RUNOFF (INCHES)11.2812.45    9.93    
10 PERCENT EXCEEDS188     165         179         
50 PERCENT EXCEEDS93     96         65         
90 PERCENT EXCEEDS59     68         26         

A - Estimated.

B - Jan. 25, 26, estimated and Sept. 5.

C - Gage height, 17.42 ft.

D - Discharge, 5,980 ft3/s.

E - Result of freezeup.



Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data