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USGS Daily Statistics for Montana

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Questions or concerns about USGS streamflow data in Montana and Wyoming can be directed to Kirk Miller (kmiller@usgs.gov; 307-775-9168).

Updated June 11, 2020 - USGS water-resources monitoring activities will be restored at the following sites:
  • 12323600 Silver Bow Creek at Opportunity, Montana (POR: 31 years)
  • 12323750 Silver Bow Creek at Warm Springs, Montana (POR: 35 years)

Updated May 12, 2020 - USGS water-resources monitoring activities were suspended effective June 1, 2020 at the following site:
  • 06088500 Muddy Creek near Vaughn, Montana (POR: 82 years)
USGS monitoring activities at this site was funded by our partner and USGS Cooperative Matching Funds (06088500). Lack of partner funding for this site resulted in suspension of all USGS monitoring activities. Efforts are ongoing to secure funding for future monitoring. Historical data will continue to be available from USGS.

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 06099500 Marias River near Shelby MT


Toole County, Montana
Hydrologic Unit Code 10030203
Latitude  48°25'37.91", Longitude 111°53'23.41" NAD83
Drainage area 2,716  square miles
Gage datum 3,087.72 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 1901-10-01 -> 2020-09-30)

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
1 250 271 441 851 1,780 3,320 1,800 469 334 380 415 322
2 248 273 437 871 1,860 3,310 1,740 462 331 382 410 323
3 244 275 433 888 1,950 3,340 1,670 472 327 389 414 341
4 242 277 428 849 2,000 3,400 1,720 470 332 392 415 336
5 242 281 429 855 2,100 3,500 1,640 440 330 390 408 325
6 243 288 435 864 2,150 3,470 1,500 424 355 388 409 319
7 243 292 441 874 2,210 3,420 1,410 414 344 387 408 315
8 244 290 454 964 2,320 3,570 1,360 406 335 388 418 308
9 245 289 469 936 2,390 4,540 1,280 398 339 394 427 306
10 249 282 477 948 2,410 3,620 1,230 397 339 402 416 295
11 251 282 513 963 2,360 3,340 1,190 383 337 401 402 295
12 253 289 532 977 2,400 3,210 1,120 378 350 407 388 295
13 252 303 542 1,010 2,460 3,210 1,050 378 357 412 385 296
14 250 323 556 1,070 2,580 3,240 1,010 364 350 412 382 292
15 254 325 554 1,070 2,640 3,160 964 367 357 412 377 289
16 256 325 590 1,110 2,760 3,080 921 364 340 420 368 286
17 260 319 632 1,120 2,870 3,250 882 355 340 426 363 288
18 258 315 640 1,160 2,960 3,260 849 351 342 421 361 288
19 256 315 668 1,210 3,020 3,080 813 340 348 420 363 288
20 255 311 697 1,230 3,050 3,380 794 336 349 415 367 287
21 257 320 723 1,260 3,240 3,160 771 344 350 409 360 290
22 249 319 684 1,290 3,430 2,790 745 341 365 412 361 287
23 248 320 653 1,330 3,370 2,760 716 345 381 416 363 283
24 250 320 669 1,340 3,430 2,690 683 363 381 416 372 280
25 252 364 691 1,360 3,430 2,530 657 350 380 412 377 279
26 255 460 684 1,380 3,440 2,360 646 343 382 421 372 280
27 263 360 700 1,420 3,550 2,200 604 336 389 428 362 286
28 273 346 701 1,500 3,500 2,130 591 333 386 419 367 273
29 277 339 716 1,560 3,370 2,020 563 331 380 419 372 272
30 271   677 1,600 3,290 1,950 535 328 371 416 368 268
31 268   668   3,280   516 332   419   264