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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 12390700 Prospect Creek at Thompson Falls MT


Sanders County, Montana
Hydrologic Unit Code 17010213
Latitude  47°35'09.82", Longitude 115°21'18.36" NAD83
Drainage area 182  square miles
Gage datum 2,382.4 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 1956-10-01 -> 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 89 130 168 338 622 731 253 98 67 53 54 118
2 90 127 172 341 626 726 241 97 66 52 55 113
3 89 122 173 346 642 728 231 95 65 52 57 118
4 87 119 172 348 657 711 221 93 65 52 60 124
5 86 125 170 352 681 690 212 92 64 51 59 126
6 86 127 170 379 705 675 203 91 64 51 58 114
7 88 127 171 403 718 650 195 89 63 51 60 104
8 90 143 170 414 716 625 189 88 62 51 65 97
9 93 189 171 424 727 603 181 87 62 51 63 93
10 101 165 184 429 738 570 175 85 61 51 62 92
11 100 148 189 426 749 544 167 84 61 51 64 93
12 97 143 196 430 752 528 161 83 60 53 70 97
13 98 137 208 436 761 519 156 82 60 53 69 101
14 98 132 210 462 768 509 152 81 59 52 67 103
15 110 130 224 469 787 503 147 80 59 52 66 104
16 171 134 247 462 814 502 142 79 58 52 67 101
17 164 138 239 459 849 496 137 78 58 51 66 99
18 144 141 239 461 858 469 134 77 58 51 66 98
19 131 150 268 465 843 441 131 76 57 50 65 95
20 127 173 260 491 834 420 127 76 57 50 65 92
21 121 186 257 524 823 400 123 75 56 50 68 90
22 116 186 251 527 813 383 120 74 56 50 71 89
23 112 176 256 537 801 369 117 73 55 50 78 98
24 109 170 261 576 799 353 114 72 55 50 94 101
25 110 171 264 587 797 336 112 72 54 50 118 98
26 111 171 271 564 801 317 110 71 54 50 117 110
27 109 167 275 553 796 299 108 70 53 51 105 119
28 108 165 283 564 784 285 105 69 53 52 96 106
29 106 209 292 570 772 276 103 69 53 52 100 95
30 107   306 590 768 265 101 68 53 53 130 92
31 126   327   753   99 67   53   89