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USGS Daily Statistics for Illinois

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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 07020500 Mississippi River at Chester, IL


Randolph County, Illinois
Hydrologic Unit Code 07140105
Latitude  37°54'02.7", Longitude  89°49'48.8" NAD83
Drainage area 708,600  square miles
Gage datum 340.73 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 1941-10-01 -> 2025-09-30)

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
1 156,000 148,000 209,000 313,000 362,000 319,000 306,000 208,000 157,000 163,000 153,000 157,000
2 157,000 151,000 209,000 314,000 365,000 317,000 308,000 205,000 157,000 160,000 158,000 156,000
3 154,000 151,000 209,000 316,000 365,000 318,000 309,000 201,000 158,000 158,000 164,000 157,000
4 153,000 151,000 212,000 320,000 364,000 318,000 309,000 197,000 156,000 158,000 169,000 159,000
5 152,000 151,000 215,000 324,000 361,000 317,000 307,000 193,000 154,000 158,000 174,000 157,000
6 151,000 151,000 219,000 326,000 358,000 316,000 303,000 190,000 153,000 158,000 177,000 157,000
7 150,000 151,000 223,000 328,000 355,000 315,000 297,000 188,000 151,000 160,000 174,000 155,000
8 147,000 151,000 225,000 328,000 354,000 314,000 291,000 185,000 148,000 162,000 169,000 153,000
9 143,000 150,000 225,000 326,000 354,000 312,000 286,000 183,000 146,000 162,000 164,000 151,000
10 141,000 149,000 227,000 325,000 353,000 309,000 282,000 181,000 145,000 162,000 160,000 149,000
11 141,000 151,000 230,000 323,000 351,000 308,000 278,000 179,000 147,000 161,000 158,000 147,000
12 140,000 153,000 234,000 326,000 348,000 310,000 274,000 175,000 148,000 162,000 156,000 145,000
13 140,000 153,000 239,000 329,000 347,000 311,000 269,000 172,000 149,000 164,000 156,000 143,000
14 140,000 154,000 243,000 333,000 344,000 309,000 264,000 168,000 149,000 164,000 156,000 140,000
15 139,000 155,000 246,000 337,000 341,000 310,000 260,000 165,000 153,000 165,000 157,000 140,000
16 137,000 156,000 252,000 339,000 341,000 312,000 258,000 164,000 156,000 164,000 158,000 140,000
17 136,000 157,000 258,000 340,000 342,000 313,000 256,000 165,000 159,000 164,000 158,000 141,000
18 136,000 159,000 264,000 338,000 346,000 312,000 252,000 165,000 163,000 164,000 159,000 141,000
19 137,000 162,000 270,000 336,000 347,000 311,000 246,000 163,000 163,000 162,000 162,000 139,000
20 137,000 165,000 276,000 336,000 348,000 310,000 241,000 161,000 161,000 160,000 163,000 137,000
21 137,000 170,000 280,000 337,000 345,000 307,000 239,000 159,000 159,000 159,000 163,000 136,000
22 136,000 180,000 283,000 340,000 341,000 304,000 236,000 158,000 159,000 159,000 163,000 137,000
23 135,000 191,000 283,000 344,000 338,000 304,000 233,000 155,000 159,000 157,000 163,000 137,000
24 138,000 198,000 284,000 346,000 332,000 307,000 234,000 152,000 159,000 156,000 162,000 137,000
25 141,000 201,000 284,000 348,000 326,000 308,000 233,000 150,000 160,000 155,000 161,000 137,000
26 141,000 204,000 285,000 349,000 323,000 309,000 230,000 149,000 162,000 154,000 159,000 136,000
27 140,000 205,000 288,000 348,000 321,000 311,000 225,000 149,000 164,000 155,000 158,000 136,000
28 140,000 207,000 293,000 348,000 321,000 311,000 220,000 149,000 165,000 154,000 159,000 139,000
29 139,000 175,000 297,000 351,000 321,000 308,000 217,000 152,000 165,000 153,000 160,000 145,000
30 140,000   302,000 357,000 321,000 304,000 214,000 155,000 165,000 152,000 159,000 150,000
31 143,000   309,000   321,000   211,000 157,000   152,000   154,000