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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 05595820 CASEY FORK AT MOUNT VERNON, IL


Jefferson County, Illinois
Hydrologic Unit Code 07140106
Latitude  38°17'12", Longitude  88°52'20" NAD83
Drainage area 76.9  square miles
Contributing drainage area 76.9  square miles
Gage datum 419.57 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 1985-10-01 -> 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 83 212 83 195 175 107 41 13 15 5.6 32 142
2 61 224 67 122 192 135 97 18 13 14 51 51
3 99 137 155 284 147 87 76 10 21 22 24 50
4 142 108 215 409 186 44 54 7.8 17 6.6 18 45
5 201 77 146 342 235 59 23 8.2 9.8 5.7 27 72
6 127 128 118 227 149 53 27 23 6.4 6.5 27 104
7 88 229 142 104 139 61 50 9 5.6 6 18 45
8 62 111 93 87 188 96 84 31 88 7.8 14 30
9 49 81 184 81 211 87 43 14 75 35 14 52
10 73 92 197 223 80 48 61 10 11 11 14 29
11 168 87 101 280 101 49 38 6.9 16 14 47 49
12 125 103 260 149 86 58 53 10 6.3 8 88 61
13 233 126 153 101 138 39 65 28 5.2 20 38 47
14 158 172 228 223 164 42 23 64 6.1 34 225 45
15 115 132 150 149 131 23 24 87 5.9 16 148 149
16 83 157 86 156 189 46 107 94 9.3 14 102 113
17 88 137 110 128 441 147 126 80 21 16 90 102
18 161 121 294 75 319 112 26 40 9.4 19 61 103
19 171 73 373 154 103 125 14 13 5.1 11 146 65
20 126 108 315 150 46 121 25 9.1 21 8 139 46
21 98 133 167 163 37 34 60 15 5.3 8.7 30 120
22 144 168 102 127 77 65 18 36 8.7 7.7 55 169
23 178 117 163 164 38 32 12 10 35 32 29 82
24 103 155 165 181 33 116 12 7.5 25 15 32 115
25 78 257 215 196 72 73 16 8.2 45 11 65 126
26 116 111 158 216 164 120 43 49 48 55 62 100
27 114 96 152 165 128 57 22 43 15 111 130 135
28 118 122 167 229 89 26 16 15 13 30 157 171
29 55 40 168 385 79 26 28 20 8.6 19 83 173
30 100   302 301 47 28 25 11 5.5 32 134 84
31 148   280   88   27 13   52   86