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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 06130000 Flatwillow Creek near Mosby MT


Petroleum County, Montana
Hydrologic Unit Code 10040203
Latitude  46°55'43.18", Longitude 107°55'58.23" NAD83
Drainage area 1,855  square miles
Gage datum 2,563 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 1963-10-01 -> 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 27 39 153 115 112 222 179 20 58 23 36 33
2 28 38 113 130 122 272 165 20 49 21 36 35
3 29 36 89 116 190 340 158 21 45 20 36 33
4 29 35 80 103 265 549 152 28 40 115 38 31
5 28 36 76 112 266 652 157 28 37 210 38 30
6 28 36 81 117 232 457 127 28 35 197 38 29
7 28 35 93 112 264 356 114 28 34 165 36 30
8 29 35 112 107 296 306 114 22 32 93 36 31
9 28 35 134 98 309 357 115 19 31 59 36 31
10 27 41 159 101 264 275 121 18 30 45 35 31
11 27 49 207 104 221 270 106 16 30 38 31 32
12 27 57 252 109 214 378 106 16 29 33 33 32
13 27 68 211 114 205 370 92 16 28 31 33 32
14 27 63 183 122 196 372 88 16 28 30 33 32
15 28 64 159 119 184 333 82 15 27 29 34 32
16 28 65 141 111 167 292 75 15 26 28 34 31
17 29 69 132 112 158 232 67 15 26 28 33 31
18 29 61 137 118 152 243 70 14 26 28 34 30
19 30 76 156 113 151 332 63 14 78 28 35 30
20 30 130 208 118 159 399 58 29 40 30 34 29
21 30 112 196 113 147 411 52 36 30 30 32 30
22 30 86 173 108 148 305 48 23 27 30 31 28
23 30 81 159 122 141 237 43 43 27 31 32 28
24 31 124 149 131 131 232 36 334 26 32 33 30
25 32 198 146 131 128 229 30 1,260 25 34 31 29
26 34 232 138 127 127 225 27 929 23 35 29 27
27 35 261 128 130 139 200 29 434 23 36 28 27
28 38 224 117 131 203 178 33 263 22 36 30 26
29 41 81 109 122 277 189 24 161 24 33 32 26
30 39   105 112 272 182 25 102 22 34 32 26
31 39   102   252   22 79   36   26