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USGS Daily Statistics for Montana

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Questions or concerns about USGS data and data products in Montana and Wyoming can be directed to the Wyoming-Montana Water Science Center Data Management Section.


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 12323800 Clark Fork near Galen MT


Deer Lodge County, Montana
Hydrologic Unit Code 17010201
Latitude  46°12'29.67", Longitude 112°46'02.46" NAD83
Drainage area 656  square miles
Gage datum 4,749 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 1987-10-01 -> 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 98 94 95 124 187 431 295 98 80 84 107 107
2 96 94 95 126 187 431 280 95 78 86 108 106
3 95 95 96 126 190 433 271 91 77 87 110 105
4 93 97 98 130 193 440 261 88 77 91 112 105
5 91 99 99 134 197 456 248 90 78 95 113 102
6 90 98 102 140 203 479 236 89 79 97 114 100
7 91 103 105 143 213 479 225 89 79 98 112 98
8 92 104 107 148 219 472 214 86 79 98 113 97
9 91 108 111 150 224 462 203 83 82 98 113 96
10 90 107 125 150 230 453 194 82 83 99 112 97
11 90 103 132 150 236 450 190 81 81 99 112 97
12 89 102 131 151 238 438 180 80 81 101 112 98
13 90 102 129 151 246 440 174 80 80 103 113 98
14 88 100 130 152 252 429 168 81 81 104 111 97
15 89 100 128 149 261 417 160 79 82 104 109 96
16 90 99 129 144 277 422 152 79 84 105 108 93
17 92 99 128 144 303 435 147 79 84 106 109 93
18 92 99 125 147 320 439 143 80 83 105 109 92
19 93 99 124 150 336 432 139 78 84 105 110 92
20 93 98 124 151 346 422 138 77 86 106 111 91
21 93 100 126 156 349 408 131 79 84 107 108 90
22 92 100 127 162 352 401 126 80 83 107 108 90
23 93 98 127 169 353 388 123 83 84 107 106 91
24 92 97 129 176 358 373 117 83 83 108 107 90
25 92 97 128 179 372 358 114 84 82 108 107 88
26 93 97 129 179 373 344 110 84 81 107 106 87
27 94 94 129 180 381 334 110 82 81 107 105 87
28 93 94 127 179 389 324 109 82 81 107 104 87
29 92 105 125 179 405 315 106 80 81 108 104 88
30 92   124 184 417 309 103 79 83 108 105 88
31 93   123   423   100 79   107   91