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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 12324590 Little Blackfoot River near Garrison MT


Powell County, Montana
Hydrologic Unit Code 17010201
Latitude  46°31'10.14", Longitude 112°47'35.42" NAD83
Drainage area 414  square miles
Gage datum 4,343.97 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 45 - 47 years of record in, ft3/s   (Calculation Period 1971-10-01 -> 2019-09-30)

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 63 78 83 169 338 550 197 83 48 59 77 69
2 61 68 89 166 337 535 188 80 49 60 77 78
3 60 63 90 156 343 542 176 77 48 62 78 83
4 63 63 94 152 362 541 190 74 47 64 79 81
5 75 64 96 161 372 529 177 72 47 65 77 73
6 69 63 91 192 379 532 167 70 47 66 77 67
7 64 63 93 206 399 516 158 68 47 67 77 64
8 65 71 107 194 399 503 152 70 49 69 80 64
9 65 116 110 198 403 480 145 65 50 69 78 67
10 63 82 128 199 429 459 153 61 50 70 76 66
11 64 73 121 209 458 451 148 59 50 71 75 66
12 63 71 114 223 453 435 142 58 54 73 75 65
13 63 73 119 223 447 431 143 57 54 74 76 66
14 62 76 125 224 458 409 142 57 53 75 74 65
15 76 79 123 226 482 393 138 56 53 77 73 66
16 82 88 132 224 503 388 133 55 53 78 73 66
17 71 100 135 233 526 399 131 55 54 78 74 64
18 66 95 138 241 550 384 127 54 56 78 73 63
19 65 103 136 246 560 408 120 51 57 78 72 61
20 64 104 132 257 551 407 117 52 57 79 71 60
21 61 108 137 269 557 384 113 52 58 79 71 60
22 61 95 146 292 653 348 109 54 58 79 71 60
23 61 84 157 312 619 325 104 54 58 78 69 59
24 60 86 153 320 630 303 101 56 58 78 71 59
25 59 94 142 328 652 277 97 53 58 78 70 67
26 61 95 143 326 630 262 94 51 57 78 70 73
27 62 83 146 324 601 250 96 50 58 78 69 63
28 62 82 141 332 579 229 92 49 58 77 69 62
29 63 75 136 338 568 214 89 49 58 77 70 61
30 63   139 344 562 202 86 49 59 76 68 59
31 67   160   557   87 48   77   61