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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).


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
1 248 269 441 852 1,760 3,300 1,800 469 334 380 412 324
2 246 271 438 873 1,840 3,290 1,740 462 331 382 407 322
3 241 273 433 891 1,940 3,340 1,670 472 327 389 411 339
4 239 276 429 852 1,990 3,400 1,720 470 332 392 411 334
5 240 280 429 858 2,090 3,500 1,640 440 330 390 405 323
6 241 287 435 866 2,150 3,470 1,500 424 355 388 406 317
7 241 291 441 876 2,210 3,420 1,410 414 344 387 408 313
8 242 289 455 966 2,320 3,570 1,360 406 335 388 416 306
9 242 288 470 937 2,390 4,540 1,280 398 339 394 424 304
10 247 281 478 949 2,420 3,620 1,230 397 339 402 413 294
11 249 281 515 963 2,370 3,340 1,190 383 337 401 403 293
12 251 288 534 975 2,410 3,210 1,120 378 350 407 386 293
13 250 302 545 1,010 2,470 3,210 1,050 378 357 412 382 294
14 248 322 561 1,070 2,590 3,240 1,010 364 350 412 380 290
15 253 325 558 1,070 2,650 3,160 964 367 357 409 374 288
16 256 325 595 1,110 2,770 3,080 921 364 340 418 364 285
17 260 318 637 1,120 2,880 3,250 882 355 340 424 361 287
18 258 314 642 1,160 2,970 3,260 849 351 342 420 359 287
19 256 314 668 1,210 3,030 3,080 813 340 348 418 361 287
20 255 310 698 1,230 3,050 3,380 794 336 349 413 364 286
21 257 319 724 1,260 3,230 3,160 771 344 350 407 358 289
22 248 318 684 1,290 3,420 2,790 745 341 365 411 361 286
23 247 319 652 1,320 3,360 2,760 716 345 381 415 361 281
24 248 319 668 1,330 3,430 2,690 683 363 381 415 368 279
25 251 364 691 1,360 3,430 2,530 657 350 380 411 374 278
26 253 460 683 1,370 3,440 2,360 646 343 382 418 370 278
27 261 360 700 1,410 3,550 2,200 604 336 389 423 361 284
28 271 345 701 1,490 3,500 2,130 591 333 386 415 369 271
29 275 336 715 1,550 3,360 2,020 563 331 380 416 374 271
30 269   675 1,590 3,290 1,950 535 328 371 415 369 267
31 266   666   3,270   516 332   417   262