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USGS Surface-Water 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 67 93 215 407 300 971 650 123 134 98 93 83
2 75 95 287 357 312 962 610 117 114 97 93 83
3 80 94 404 318 323 980 557 126 111 96 95 84
4 76 97 345 300 325 1,000 570 117 107 119 97 84
5 77 104 319 291 325 935 542 114 103 126 98 81
6 86 111 311 283 359 911 541 123 101 118 99 78
7 81 113 346 289 451 942 523 122 104 114 98 78
8 80 108 353 289 439 1,050 446 118 126 100 98 76
9 81 106 382 285 450 1,190 408 111 109 92 96 77
10 80 107 404 299 536 1,230 386 109 109 89 94 77
11 77 106 473 323 660 1,100 339 118 102 88 92 78
12 75 119 555 359 573 1,170 324 104 107 88 91 77
13 74 156 519 338 541 1,100 329 104 113 86 90 79
14 75 249 472 340 516 1,110 354 100 110 85 91 77
15 75 285 424 361 496 1,050 297 111 106 86 90 76
16 75 293 403 357 501 987 281 128 109 85 93 76
17 79 301 395 349 495 1,110 256 120 105 85 93 78
18 79 257 453 347 525 1,180 239 111 106 86 93 79
19 80 235 454 319 589 1,090 229 104 153 88 91 78
20 84 218 461 299 645 1,040 225 110 123 89 88 77
21 85 199 555 290 737 1,060 240 116 110 90 84 77
22 84 187 599 283 826 1,040 196 111 105 90 86 77
23 84 170 587 305 867 951 177 116 104 96 87 76
24 85 164 569 327 869 929 172 166 105 93 89 76
25 86 212 593 308 899 900 164 281 196 92 88 77
26 85 271 592 292 856 850 156 235 162 91 88 75
27 89 240 613 285 881 836 225 170 114 90 87 74
28 92 231 603 284 953 869 196 143 107 90 86 72
29 95 196 532 299 942 784 149 131 100 91 84 70
30 96   486 300 976 703 140 119 97 89 81 69
31 96   440   1,010   130 119   90   68