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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 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 -> 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 68 95 216 405 298 962 644 122 133 98 93 84
2 76 97 288 355 309 953 605 117 113 97 93 84
3 81 96 403 317 320 972 552 125 110 95 95 85
4 77 99 344 299 322 993 565 116 106 119 97 85
5 79 105 318 289 322 928 537 113 102 125 98 83
6 87 113 310 282 355 905 536 122 101 117 99 80
7 82 115 345 287 448 934 518 121 103 113 98 80
8 81 110 352 291 452 1,040 442 117 125 100 98 79
9 82 108 381 285 469 1,180 404 111 108 92 96 79
10 81 108 403 298 540 1,220 383 109 108 89 94 79
11 78 107 471 322 659 1,090 337 118 101 88 92 80
12 76 120 552 357 574 1,160 321 104 106 88 91 78
13 74 157 516 336 543 1,090 326 104 112 86 90 80
14 75 249 470 338 517 1,100 351 100 109 84 90 78
15 75 284 422 358 496 1,040 295 110 105 86 92 77
16 76 292 402 355 500 977 278 128 108 85 95 77
17 79 300 394 346 494 1,090 254 119 104 85 95 78
18 79 257 451 344 523 1,170 237 111 106 86 95 80
19 80 236 452 317 586 1,080 227 103 159 88 93 79
20 85 218 459 297 641 1,030 223 109 126 89 90 79
21 86 200 552 288 732 1,050 238 115 112 90 86 79
22 85 188 596 281 820 1,040 194 111 106 90 88 79
23 85 171 584 303 860 947 176 115 105 96 88 77
24 86 166 566 324 862 923 171 165 106 93 91 76
25 87 214 590 305 892 894 162 279 196 92 89 77
26 86 272 589 290 850 843 154 233 162 91 90 75
27 90 241 609 283 875 829 223 169 114 90 88 74
28 93 231 600 282 946 861 194 142 107 91 87 72
29 96 202 529 296 935 777 147 130 100 91 85 70
30 98   484 298 968 697 139 118 97 89 82 69
31 98   438   1,000   129 118   90   69