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USGS Daily Statistics for the Nation

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
1 253 269 416 794 1,680 3,170 1,750 442 322 349 398 345
2 250 271 418 817 1,760 3,150 1,680 437 317 353 396 343
3 246 273 449 834 1,840 3,180 1,610 444 312 358 399 356
4 244 274 432 805 1,880 3,220 1,640 440 314 361 399 351
5 242 277 424 816 1,970 3,320 1,560 414 312 361 394 337
6 242 282 426 834 2,030 3,320 1,440 400 335 363 394 326
7 246 286 431 846 2,110 3,290 1,340 391 327 364 399 320
8 249 289 439 922 2,230 3,490 1,290 385 319 364 406 314
9 250 296 452 900 2,290 4,240 1,210 379 322 367 409 312
10 251 299 466 910 2,300 3,480 1,160 378 320 372 403 303
11 249 295 504 926 2,250 3,300 1,120 364 318 372 401 303
12 251 296 536 937 2,290 3,140 1,060 362 328 379 411 302
13 250 304 545 960 2,350 3,110 999 362 332 389 416 304
14 250 316 561 1,020 2,470 3,100 960 349 326 390 404 302
15 252 316 561 1,030 2,530 3,000 916 349 330 389 402 300
16 254 316 583 1,070 2,630 2,930 875 346 318 396 397 296
17 254 310 607 1,080 2,740 3,060 836 340 318 400 393 295
18 253 307 607 1,120 2,830 3,050 803 339 321 396 386 292
19 252 309 642 1,170 2,890 2,890 767 330 328 396 384 287
20 252 308 706 1,180 2,950 3,120 744 325 329 391 385 283
21 255 318 711 1,220 3,100 2,990 721 330 329 386 377 284
22 247 316 664 1,260 3,230 2,700 702 326 341 391 373 280
23 246 316 633 1,300 3,180 2,660 676 329 353 394 371 274
24 247 317 645 1,310 3,240 2,560 640 344 353 393 376 272
25 249 353 665 1,340 3,240 2,390 614 335 351 389 378 274
26 250 430 668 1,350 3,280 2,230 605 334 351 396 377 275
27 258 349 689 1,370 3,370 2,080 571 331 357 402 365 282
28 267 338 687 1,440 3,310 2,020 556 326 356 397 365 271
29 271 337 692 1,500 3,200 1,920 528 322 350 397 370 271
30 266   655 1,520 3,150 1,860 501 318 343 394 372 268
31 264   643   3,140   483 322   400   265