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USGS Daily Statistics for the Nation

The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 05587450 Mississippi River at Grafton, IL


Jersey County, Illinois
Hydrologic Unit Code 07110009
Latitude  38°58'04.7", Longitude  90°25'44.4" NAD83
Drainage area 171,300  square miles
Gage datum 403.32 feet above NAVD88
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00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 1986-10-01 -> 2023-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 96,800 88,600 123,000 180,000 225,000 207,000 197,000 134,000 102,000 89,900 101,000 95,400
2 94,300 87,500 126,000 180,000 224,000 208,000 197,000 129,000 99,000 92,000 102,000 94,500
3 93,300 87,900 127,000 182,000 224,000 210,000 195,000 127,000 95,300 94,300 104,000 95,400
4 95,100 88,800 126,000 185,000 224,000 209,000 193,000 124,000 92,900 96,200 105,000 96,900
5 96,200 91,300 126,000 187,000 226,000 207,000 187,000 120,000 93,000 98,300 105,000 94,800
6 95,400 92,000 131,000 185,000 229,000 205,000 185,000 117,000 91,000 96,000 102,000 94,200
7 92,300 90,500 133,000 185,000 228,000 203,000 183,000 114,000 86,400 96,000 99,800 92,300
8 92,800 90,200 132,000 186,000 228,000 200,000 181,000 111,000 83,700 97,500 98,300 91,700
9 92,500 90,800 134,000 188,000 227,000 197,000 178,000 108,000 83,100 99,000 96,400 88,200
10 90,400 93,100 141,000 192,000 225,000 195,000 178,000 105,000 85,700 99,100 96,400 86,300
11 92,700 93,100 147,000 197,000 224,000 195,000 174,000 103,000 89,300 98,300 97,100 87,300
12 92,200 94,000 151,000 200,000 224,000 197,000 172,000 102,000 88,400 98,300 97,500 85,900
13 91,600 94,800 154,000 201,000 223,000 196,000 170,000 98,700 87,700 99,600 96,500 84,500
14 90,900 96,700 157,000 203,000 222,000 197,000 164,000 96,000 90,700 101,000 96,900 86,100
15 88,600 93,100 160,000 202,000 220,000 197,000 160,000 95,300 92,300 103,000 95,800 85,600
16 88,400 90,000 164,000 202,000 220,000 198,000 160,000 93,300 94,900 102,000 94,000 87,300
17 86,900 92,200 164,000 204,000 223,000 196,000 159,000 92,400 94,500 102,000 94,200 89,300
18 85,800 94,600 168,000 204,000 224,000 197,000 154,000 92,100 93,100 102,000 94,800 89,200
19 83,200 95,200 172,000 206,000 223,000 196,000 149,000 91,500 91,900 102,000 94,500 89,300
20 82,300 96,100 175,000 207,000 222,000 195,000 147,000 90,500 92,100 103,000 93,800 87,000
21 82,700 102,000 173,000 209,000 221,000 195,000 145,000 90,100 91,900 103,000 93,800 88,700
22 82,600 107,000 169,000 211,000 219,000 194,000 144,000 89,500 89,100 101,000 93,800 88,600
23 85,500 114,000 165,000 214,000 213,000 194,000 143,000 90,100 90,500 100,000 91,300 87,600
24 87,000 117,000 167,000 215,000 207,000 197,000 143,000 91,800 88,600 101,000 90,900 88,600
25 88,800 119,000 170,000 215,000 205,000 199,000 145,000 93,600 87,800 102,000 92,000 88,200
26 90,200 121,000 173,000 215,000 207,000 204,000 144,000 94,600 88,200 101,000 91,800 87,400
27 90,400 121,000 175,000 216,000 209,000 205,000 143,000 95,400 88,500 99,000 93,000 88,400
28 91,000 123,000 176,000 219,000 212,000 204,000 141,000 98,500 89,100 99,000 95,100 90,300
29 89,600 115,000 174,000 222,000 212,000 203,000 138,000 100,000 89,400 99,200 93,700 92,900
30 91,400   176,000 224,000 212,000 199,000 137,000 100,000 87,800 101,000 93,200 94,100
31 91,100   179,000   210,000   135,000 101,000   100,000   95,600