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  • Notice - The USGS Water Resources Mission Area's priority is to maintain the safety and well-being of our communities, including providing critical situational awareness in times of flooding in all 50 U.S. states and additional territories. Our hydrologic monitoring stations continue to send data in near real-time to NWISWeb, and we are continuing critical water monitoring activities to protect life and property on a case-by-case basis. The health and safety of the public and our employees are our highest priorities, and we continue to follow guidance from the White House, the CDC, and state and local authorities.

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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 403.79 feet above NGVD29
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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 -> 2020-09-30)

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 99,500 90,800 122,000 174,000 223,000 209,000 202,000 136,000 104,000 93,600 103,000 97,400
2 96,400 90,300 124,000 174,000 223,000 209,000 200,000 131,000 101,000 96,000 103,000 96,500
3 95,400 90,600 125,000 177,000 224,000 209,000 199,000 129,000 96,500 98,200 106,000 97,300
4 97,700 91,400 123,000 180,000 225,000 209,000 197,000 127,000 94,000 101,000 107,000 99,500
5 99,100 92,600 123,000 181,000 227,000 209,000 193,000 123,000 94,100 103,000 107,000 97,200
6 97,400 93,500 129,000 181,000 229,000 207,000 191,000 120,000 91,600 99,800 104,000 96,400
7 94,700 92,200 131,000 181,000 229,000 206,000 189,000 117,000 86,600 100,000 101,000 95,000
8 94,500 92,900 130,000 181,000 228,000 203,000 186,000 114,000 84,200 102,000 99,700 95,000
9 94,300 93,800 133,000 184,000 228,000 201,000 183,000 109,000 83,600 103,000 97,600 90,700
10 91,900 92,900 140,000 188,000 226,000 200,000 182,000 106,000 86,600 104,000 97,800 88,900
11 94,100 91,700 146,000 193,000 223,000 199,000 178,000 105,000 90,700 103,000 99,100 89,900
12 93,500 92,300 150,000 195,000 222,000 200,000 176,000 103,000 90,400 103,000 99,300 88,400
13 92,600 94,800 153,000 197,000 223,000 199,000 172,000 98,900 88,700 104,000 98,200 85,700
14 91,800 97,300 157,000 198,000 223,000 201,000 166,000 96,400 91,900 105,000 98,100 86,900
15 89,500 93,400 160,000 197,000 222,000 202,000 164,000 96,200 94,300 107,000 96,700 86,100
16 89,800 90,600 163,000 198,000 222,000 203,000 163,000 94,300 96,500 106,000 94,900 88,100
17 88,500 92,600 164,000 201,000 223,000 201,000 161,000 94,000 96,600 106,000 94,800 90,300
18 87,000 93,900 167,000 202,000 222,000 203,000 155,000 93,700 95,600 106,000 95,600 90,600
19 83,500 94,200 169,000 205,000 221,000 202,000 150,000 93,000 94,800 106,000 95,000 90,300
20 82,700 95,700 172,000 206,000 220,000 201,000 149,000 92,100 94,600 107,000 94,100 88,400
21 83,400 102,000 170,000 209,000 220,000 202,000 148,000 92,000 94,500 107,000 94,300 90,300
22 83,400 108,000 165,000 211,000 218,000 201,000 148,000 91,400 92,000 105,000 94,600 89,900
23 86,300 114,000 162,000 213,000 214,000 202,000 147,000 92,400 93,500 104,000 92,100 89,000
24 88,100 117,000 163,000 214,000 209,000 206,000 148,000 94,400 91,500 104,000 92,100 90,700
25 90,800 119,000 165,000 214,000 206,000 207,000 148,000 96,700 91,200 103,000 93,300 90,400
26 92,200 121,000 166,000 213,000 207,000 210,000 146,000 97,400 91,900 102,000 93,400 89,700
27 92,200 122,000 169,000 214,000 209,000 211,000 145,000 97,600 92,200 100,000 94,600 90,600
28 92,800 123,000 169,000 217,000 212,000 209,000 144,000 101,000 92,500 100,000 97,100 92,800
29 91,500 110,000 168,000 220,000 213,000 208,000 142,000 104,000 92,400 100,000 95,900 95,200
30 93,400   170,000 222,000 212,000 205,000 140,000 103,000 90,900 101,000 95,900 96,600
31 93,200   173,000   211,000   137,000 104,000   102,000   98,300