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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 06130500 Musselshell River at Mosby MT


Petroleum County, Montana
Hydrologic Unit Code 10040205
Latitude  46°59'40.89", Longitude 107°53'20.99" NAD83
Drainage area 7,784  square miles
Gage datum 2,493.9 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 1930-10-01 -> 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 68 95 216 405 298 971 650 123 134 98 93 84
2 76 97 288 355 309 962 610 117 114 97 93 84
3 81 96 403 317 320 980 557 126 111 96 95 85
4 78 99 344 299 322 1,000 570 117 107 119 97 86
5 79 105 318 289 322 935 542 114 103 126 98 83
6 87 113 310 282 355 911 541 123 101 118 99 81
7 83 115 345 287 448 942 523 122 104 114 98 80
8 81 110 352 291 452 1,050 446 118 126 100 98 79
9 82 108 381 285 469 1,190 408 111 109 92 96 79
10 81 108 403 298 540 1,230 386 109 109 89 94 79
11 78 107 471 322 659 1,100 339 118 102 88 92 80
12 76 120 552 357 574 1,170 324 104 107 88 91 78
13 74 157 516 336 543 1,100 329 104 113 86 90 80
14 75 249 470 338 517 1,110 354 100 110 85 91 78
15 75 284 422 358 496 1,050 297 111 106 86 92 77
16 76 292 402 355 500 987 281 128 109 85 95 77
17 80 300 394 346 494 1,110 256 120 105 85 96 78
18 79 257 451 344 523 1,180 239 111 106 86 95 80
19 81 236 452 317 586 1,090 229 104 153 88 93 79
20 85 218 459 297 641 1,040 225 110 123 89 90 79
21 86 200 552 288 732 1,060 240 116 110 90 87 79
22 86 188 596 281 820 1,040 196 111 105 90 88 79
23 86 171 584 303 860 951 177 116 104 96 89 78
24 86 166 566 324 862 929 172 166 105 93 91 77
25 88 214 590 305 892 900 164 281 196 92 90 77
26 87 272 589 290 850 850 156 235 162 91 90 75
27 91 241 609 283 875 836 225 170 114 90 89 74
28 94 231 600 282 946 869 196 143 107 90 87 72
29 97 202 529 296 935 784 149 131 100 91 85 71
30 98   484 298 976 703 140 119 97 89 83 69
31 98   438   1,010   130 119   90   69