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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 05020500 St. Mary River at International Boundary


000, 95
Hydrologic Unit Code --
Latitude  49°00'41.07", Longitude 113°17'58.37" NAD83
Drainage area 462  square miles
Gage datum 4,116.04 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
1 162 149 157 259 881 2,450 1,950 776 476 442 386 265
2 162 150 157 259 919 2,480 1,880 754 467 448 383 265
3 163 149 157 265 958 2,550 1,850 732 466 451 378 262
4 165 149 158 275 980 2,660 1,800 706 458 453 376 259
5 164 149 160 287 1,010 2,800 1,760 680 458 452 372 254
6 164 149 161 302 1,060 2,830 1,710 655 460 456 368 249
7 163 150 162 311 1,110 2,860 1,650 638 461 453 374 241
8 161 149 162 313 1,190 2,930 1,590 630 456 454 404 236
9 159 148 164 319 1,240 2,890 1,530 620 455 450 410 230
10 159 148 173 333 1,290 2,800 1,490 608 453 449 403 226
11 155 147 177 344 1,330 2,740 1,450 597 455 445 389 220
12 152 148 177 356 1,370 2,690 1,410 583 456 443 388 216
13 150 148 177 378 1,410 2,680 1,370 570 462 441 388 210
14 150 148 177 404 1,460 2,650 1,340 566 459 439 387 206
15 151 151 179 416 1,510 2,590 1,310 561 459 435 386 201
16 150 155 185 440 1,590 2,580 1,270 550 462 436 382 199
17 150 154 188 460 1,660 2,650 1,230 539 463 440 374 198
18 150 153 193 475 1,740 2,650 1,190 530 466 444 364 195
19 149 152 198 482 1,820 2,640 1,150 519 469 438 354 193
20 148 148 216 505 1,880 2,670 1,110 509 473 435 343 191
21 147 147 227 538 1,930 2,620 1,080 509 475 430 336 189
22 147 147 226 564 2,000 2,520 1,060 506 480 422 327 187
23 148 147 225 594 2,090 2,420 1,030 505 480 415 318 183
24 148 153 218 623 2,170 2,340 991 510 481 409 316 180
25 148 156 220 659 2,230 2,260 961 503 475 401 311 176
26 148 153 221 695 2,340 2,210 931 498 474 399 304 173
27 148 150 226 732 2,360 2,150 903 488 465 397 297 170
28 149 150 232 762 2,350 2,090 895 489 457 395 290 169
29 149 158 238 792 2,370 2,040 864 483 452 391 284 168
30 150   243 831 2,380 1,990 828 484 445 391 278 167
31 149   252   2,410   798 486   391   166