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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 -> 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
1 252 267 414 792 1,680 3,160 1,750 442 322 349 396 342
2 249 270 416 814 1,750 3,140 1,680 437 317 353 394 341
3 244 271 446 830 1,830 3,160 1,610 444 312 358 397 353
4 242 272 430 801 1,870 3,210 1,640 440 314 361 397 349
5 240 275 422 812 1,970 3,300 1,560 414 312 361 391 335
6 241 280 424 830 2,030 3,300 1,440 400 335 363 392 324
7 244 284 429 842 2,110 3,270 1,340 391 327 364 396 319
8 247 287 437 917 2,230 3,460 1,290 385 319 364 404 312
9 248 294 450 896 2,280 4,240 1,210 379 322 367 407 311
10 249 297 463 906 2,290 3,480 1,160 378 320 372 401 301
11 248 293 501 921 2,250 3,300 1,120 364 318 372 399 301
12 250 294 533 932 2,290 3,140 1,060 362 328 379 409 301
13 249 301 542 957 2,350 3,110 999 362 332 389 414 302
14 249 314 557 1,020 2,470 3,100 960 349 326 390 402 301
15 251 314 558 1,030 2,520 3,000 916 349 330 389 399 298
16 253 314 579 1,070 2,630 2,930 875 346 318 396 394 294
17 253 308 603 1,070 2,730 3,060 836 340 318 400 391 294
18 252 305 604 1,110 2,820 3,050 803 339 321 396 384 290
19 250 307 638 1,160 2,880 2,890 767 330 328 396 381 285
20 250 306 702 1,180 2,930 3,120 744 325 329 391 382 282
21 253 316 707 1,220 3,080 2,990 721 330 329 386 374 282
22 245 314 659 1,250 3,210 2,700 702 326 341 389 371 278
23 244 315 629 1,300 3,160 2,660 676 329 353 392 369 273
24 246 315 641 1,310 3,220 2,560 640 344 353 391 373 271
25 248 351 661 1,330 3,220 2,390 614 335 351 387 376 273
26 249 428 664 1,340 3,260 2,230 605 334 351 394 374 274
27 256 347 686 1,370 3,350 2,080 571 331 357 400 363 281
28 266 336 685 1,430 3,290 2,020 556 326 356 394 363 270
29 269 337 691 1,490 3,190 1,920 528 322 350 395 367 270
30 265   655 1,520 3,140 1,860 501 318 343 392 370 266
31 263   642   3,130   483 322   398   264