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USGS Surface-Water 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 -> 2021-09-30)

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
1 254 270 421 800 1,710 3,220 1,780 450 328 356 399 347
2 250 272 424 823 1,770 3,200 1,720 446 322 360 398 345
3 245 274 455 842 1,850 3,220 1,640 453 317 365 402 355
4 243 276 438 811 1,890 3,270 1,670 449 320 368 402 348
5 242 279 430 822 1,990 3,360 1,590 421 318 367 397 335
6 242 283 430 840 2,040 3,360 1,460 407 341 370 397 326
7 246 288 435 855 2,110 3,330 1,360 397 333 371 396 320
8 249 292 443 934 2,230 3,540 1,310 391 325 371 404 313
9 250 299 457 910 2,300 4,320 1,230 384 328 374 413 312
10 251 303 471 919 2,320 3,540 1,180 382 327 380 408 301
11 250 298 511 934 2,280 3,340 1,140 368 324 379 404 302
12 252 300 543 944 2,320 3,170 1,080 367 334 387 414 302
13 252 307 553 969 2,380 3,140 1,020 367 339 396 419 304
14 251 321 568 1,030 2,500 3,140 977 354 331 398 407 303
15 253 321 569 1,040 2,550 3,050 934 354 336 397 404 300
16 255 320 591 1,080 2,660 2,970 892 352 323 404 398 295
17 255 314 616 1,090 2,760 3,110 852 346 324 409 392 295
18 254 310 616 1,130 2,850 3,110 819 345 327 405 385 291
19 253 313 651 1,180 2,910 2,940 782 334 334 404 383 287
20 253 312 718 1,200 2,970 3,170 758 330 335 400 384 283
21 256 322 724 1,240 3,130 3,010 735 334 336 394 377 284
22 248 320 675 1,280 3,280 2,720 717 330 347 397 374 280
23 247 320 642 1,330 3,230 2,690 690 333 360 400 373 275
24 249 321 652 1,340 3,290 2,590 653 347 359 398 378 274
25 251 358 669 1,370 3,290 2,430 627 338 357 394 381 276
26 252 437 666 1,380 3,330 2,270 617 338 358 402 380 277
27 259 352 689 1,400 3,420 2,120 582 335 365 408 369 284
28 269 341 688 1,470 3,360 2,060 567 330 363 403 369 273
29 272 343 693 1,520 3,240 1,960 539 326 358 403 373 272
30 267   654 1,550 3,180 1,900 510 323 350 400 376 269
31 265   643   3,180   492 327   403   266