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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 27 39 153 115 112 222 165 20 58 23 36 33
2 28 38 113 130 122 272 152 20 49 21 36 35
3 29 36 89 116 190 340 146 21 45 20 36 33
4 29 35 80 103 265 509 140 28 40 115 38 31
5 28 36 76 112 266 604 145 28 37 210 38 30
6 28 36 81 117 232 424 117 28 35 197 38 29
7 28 35 93 112 264 330 105 28 34 165 36 30
8 29 35 112 107 296 284 105 22 32 93 36 31
9 28 35 134 98 309 331 106 19 31 59 36 31
10 27 41 159 101 264 254 111 18 30 45 35 31
11 27 49 207 104 221 250 98 16 30 38 31 32
12 27 57 252 109 214 349 97 16 29 33 33 32
13 27 68 211 114 205 342 85 16 28 31 33 32
14 27 63 183 122 196 362 81 16 28 30 33 32
15 28 64 159 119 184 315 75 15 27 29 34 32
16 28 65 141 111 167 276 69 15 26 28 34 31
17 29 69 132 112 158 220 67 15 26 28 33 31
18 29 61 137 118 152 228 70 14 26 28 34 30
19 30 76 156 113 151 309 63 14 78 28 35 30
20 30 130 208 118 159 371 58 29 40 30 34 29
21 30 112 196 113 147 382 52 36 30 30 32 30
22 30 86 173 108 148 284 48 23 27 30 31 28
23 30 81 159 122 141 222 43 43 27 31 32 28
24 31 124 149 131 131 217 36 334 26 32 33 30
25 32 198 146 131 128 214 30 1,260 25 34 31 29
26 34 232 138 127 127 210 27 929 23 35 29 27
27 35 261 128 130 139 187 29 434 23 36 28 27
28 38 224 117 131 203 166 33 263 22 36 30 26
29 41 81 109 122 277 176 24 161 24 33 32 26
30 39   105 112 272 169 25 102 22 34 32 26
31 39   102   252   22 79   36   26