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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 -> 2024-09-30)

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 44 72 122 121 238 195 22 63 24 39 37
2 30 42 65 139 133 292 179 22 53 22 39 40
3 31 40 57 123 206 365 171 23 49 22 39 37
4 31 39 57 109 288 594 165 31 43 125 41 35
5 31 40 60 119 289 706 171 30 40 229 42 34
6 30 40 70 124 252 495 137 31 38 214 41 33
7 30 39 87 117 285 385 123 30 37 180 39 33
8 31 39 112 112 315 331 124 24 35 101 39 34
9 30 39 139 102 305 387 125 21 34 65 38 35
10 29 46 171 106 263 297 132 19 32 49 38 35
11 30 56 229 110 212 293 116 18 32 41 33 36
12 30 65 283 115 190 410 115 17 31 36 36 36
13 30 79 234 121 175 401 100 18 30 34 36 36
14 30 73 201 130 171 405 96 17 30 33 36 36
15 31 74 174 127 166 362 89 16 29 32 39 36
16 32 76 153 118 155 318 81 16 28 31 38 35
17 33 80 143 119 147 253 73 16 28 30 38 35
18 33 70 150 127 143 263 75 15 28 30 38 34
19 34 88 173 121 144 360 68 15 27 30 39 33
20 34 153 236 127 156 433 63 32 26 33 39 33
21 33 131 221 121 146 444 56 39 26 33 35 34
22 33 100 195 117 149 322 52 25 26 33 34 32
23 34 90 180 132 143 251 47 47 26 33 35 32
24 35 98 168 141 133 247 39 364 26 34 37 33
25 36 102 156 142 133 244 33 1,380 25 37 34 32
26 38 96 148 138 131 241 30 1,010 24 38 32 30
27 39 102 137 141 143 215 32 473 24 38 31 29
28 43 86 125 142 214 191 36 286 24 38 33 28
29 46 135 115 133 295 204 27 176 26 36 36 28
30 44   111 121 291 196 27 111 24 37 36 27
31 44   108   269   24 86   39   28