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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 80 212 84 197 173 110 37 13 15 5.6 33 145
2 61 226 68 119 194 138 99 18 13 14 52 52
3 100 138 158 256 144 89 77 10 21 23 24 51
4 145 110 220 390 158 44 55 7.9 17 6.6 17 45
5 205 78 148 170 231 58 24 8.2 9.8 5.6 22 74
6 130 130 119 169 148 48 28 23 6.4 6.5 25 107
7 89 234 144 96 140 30 51 9 5.6 5.9 18 46
8 63 113 94 85 170 91 86 31 88 7.8 14 30
9 50 82 188 80 193 87 44 14 75 36 14 53
10 75 94 201 227 78 48 62 10 11 11 13 29
11 172 88 103 285 101 49 39 6.9 16 15 48 50
12 128 105 266 151 86 59 54 10 6.3 8.1 90 62
13 238 129 156 102 138 39 66 28 5.2 20 38 48
14 162 176 233 228 167 42 23 64 6.1 35 229 46
15 118 119 153 152 133 23 24 87 5.9 16 152 152
16 85 113 87 159 193 44 110 94 9.3 14 104 99
17 89 134 112 131 451 141 129 80 21 16 92 93
18 133 121 301 77 327 114 26 40 9.4 19 62 102
19 165 74 382 152 105 128 13 13 5.1 12 150 65
20 127 110 322 146 40 124 26 9.1 21 8.1 143 46
21 99 135 171 149 36 34 62 15 5.3 8.7 31 122
22 147 171 104 125 78 66 18 36 8.7 7.7 56 172
23 182 119 151 166 39 33 13 10 35 32 30 84
24 105 157 158 184 34 118 12 7.5 25 15 32 118
25 80 260 218 189 73 74 16 8.2 45 11 67 128
26 119 112 160 209 167 123 44 49 48 56 63 100
27 117 97 154 166 131 58 23 43 15 113 133 135
28 121 124 168 233 91 26 16 15 13 31 160 172
29 56 40 170 386 81 27 28 20 8.6 19 85 145
30 100   306 297 47 28 26 11 5.5 33 137 69
31 142   275   90   28 13   53   77