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USGS Daily Statistics for the Nation

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 29 42 69 115 112 222 179 20 58 23 39 35
2 30 40 62 130 122 272 165 20 49 21 39 37
3 30 39 55 116 190 340 158 21 45 22 39 35
4 30 38 55 103 265 549 152 28 40 125 41 33
5 30 38 57 112 266 652 157 28 37 229 42 32
6 30 38 67 117 232 457 127 28 35 214 41 31
7 30 38 83 112 264 356 114 28 34 180 39 31
8 30 37 106 107 296 306 114 22 32 101 39 33
9 30 38 131 98 309 357 115 19 31 65 38 33
10 29 44 160 101 264 275 121 18 30 49 38 33
11 29 53 213 104 221 270 106 16 30 41 33 34
12 29 62 263 109 214 378 106 16 29 36 36 34
13 29 74 219 114 205 370 92 16 28 34 36 34
14 28 69 189 122 196 372 88 16 28 33 36 34
15 30 69 164 119 184 333 82 15 27 32 36 34
16 30 71 145 111 167 292 75 15 26 31 36 33
17 31 74 135 112 158 232 67 15 26 30 36 33
18 31 66 141 118 152 243 70 14 26 30 36 32
19 32 82 162 113 151 332 63 14 78 30 37 31
20 32 142 219 118 159 399 58 29 40 33 37 31
21 32 122 206 113 147 411 52 36 30 33 34 32
22 32 93 181 108 148 305 48 23 27 33 33 30
23 32 84 167 122 141 237 43 43 27 33 34 30
24 33 92 157 131 131 232 36 334 26 34 36 32
25 34 96 146 131 128 229 30 1,260 25 37 33 30
26 36 89 138 127 127 225 27 929 23 38 31 29
27 37 95 128 130 139 200 29 434 23 38 30 28
28 41 80 117 131 203 178 33 263 22 38 32 28
29 44 81 109 122 277 189 24 161 24 36 35 27
30 42   105 112 272 182 25 102 22 37 35 27
31 42   102   252   22 79   39   28