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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 83 195 173 110 37 13 15 5.6 32 142
2 61 224 67 119 194 138 99 18 13 14 51 51
3 99 137 155 256 144 89 77 10 21 22 24 50
4 142 108 215 390 158 44 55 7.9 17 6.6 18 45
5 201 77 146 170 231 58 24 8.2 9.8 5.7 27 72
6 127 128 118 169 148 48 28 23 6.4 6.5 27 104
7 88 229 142 96 140 30 51 9 5.6 6 18 45
8 62 111 93 85 170 91 86 31 88 7.8 14 30
9 49 81 184 80 193 87 44 14 75 35 14 52
10 73 92 197 227 78 48 62 10 11 11 14 29
11 168 87 101 285 101 49 39 6.9 16 14 47 49
12 125 103 260 151 86 59 54 10 6.3 8 88 61
13 233 126 153 102 138 39 66 28 5.2 20 38 47
14 158 172 228 228 167 42 23 64 6.1 34 225 45
15 115 132 150 152 133 23 24 87 5.9 16 148 149
16 83 157 86 159 193 44 110 94 9.3 14 102 113
17 88 137 110 131 451 141 129 80 21 16 90 102
18 161 121 294 77 327 114 26 40 9.4 19 61 103
19 171 73 373 152 105 128 13 13 5.1 11 146 65
20 126 108 315 146 40 124 26 9.1 21 8 139 46
21 98 133 167 149 36 34 62 15 5.3 8.7 30 120
22 144 168 102 125 78 66 18 36 8.7 7.7 55 169
23 178 117 163 166 39 33 13 10 35 32 29 82
24 103 155 165 184 34 118 12 7.5 25 15 32 115
25 78 257 215 189 73 74 16 8.2 45 11 65 126
26 116 111 158 209 167 123 44 49 48 55 62 100
27 114 96 152 166 131 58 23 43 15 111 130 135
28 118 122 167 233 91 26 16 15 13 30 157 171
29 55 40 168 386 81 27 28 20 8.6 19 83 173
30 100   302 297 47 28 26 11 5.5 32 134 84
31 148   280   90   28 13   52   86