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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 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 -> 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
1 253 269 418 798 1,690 3,190 1,760 445 324 351 398 345
2 250 272 421 821 1,770 3,170 1,690 440 318 355 396 343
3 246 274 451 838 1,850 3,190 1,620 447 314 360 399 356
4 244 275 434 808 1,890 3,240 1,650 443 316 363 399 351
5 242 278 427 817 1,980 3,340 1,570 416 314 363 394 337
6 242 283 428 835 2,040 3,330 1,450 401 336 365 394 326
7 246 287 433 848 2,120 3,310 1,350 392 328 366 399 320
8 249 290 442 924 2,240 3,500 1,300 386 320 366 406 314
9 250 297 455 903 2,300 4,270 1,220 380 323 369 409 312
10 251 301 468 913 2,310 3,500 1,160 379 322 374 403 303
11 249 296 507 929 2,270 3,320 1,120 364 319 374 401 303
12 251 297 539 940 2,300 3,160 1,060 362 330 381 411 302
13 250 305 548 964 2,360 3,130 1,000 363 334 391 416 304
14 250 318 564 1,030 2,480 3,120 965 349 327 393 404 302
15 252 318 565 1,030 2,530 3,020 922 350 331 392 402 300
16 254 317 586 1,070 2,640 2,940 880 347 319 398 397 296
17 254 311 610 1,070 2,740 3,070 841 341 320 402 393 295
18 253 308 611 1,110 2,830 3,070 808 340 322 398 386 292
19 252 310 645 1,170 2,890 2,910 772 331 329 398 384 287
20 252 310 710 1,190 2,960 3,140 748 326 330 393 385 283
21 255 319 715 1,230 3,110 3,010 725 331 331 388 377 284
22 247 318 667 1,260 3,250 2,720 707 327 342 391 373 280
23 246 318 636 1,310 3,190 2,670 681 330 355 394 371 274
24 249 318 648 1,320 3,250 2,570 644 345 354 393 376 272
25 250 355 668 1,350 3,250 2,410 618 337 352 389 378 274
26 251 433 671 1,350 3,300 2,250 609 336 353 396 377 275
27 258 350 692 1,380 3,390 2,100 575 333 359 402 365 282
28 268 339 690 1,450 3,330 2,030 559 327 358 397 365 271
29 272 343 695 1,500 3,220 1,930 532 323 352 397 370 271
30 267   658 1,530 3,160 1,870 504 320 345 394 372 268
31 265   646   3,160   486 323   400   265