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USGS Surface-Water Daily Statistics for Montana

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Questions or concerns about USGS streamflow data in Montana and Wyoming can be directed to Kirk Miller (kmiller@usgs.gov; 307-775-9168).


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 -> 2019-09-30)

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
1 162 151 159 263 885 2,460 1,940 788 480 448 384 266
2 161 151 160 264 919 2,490 1,880 765 471 455 381 264
3 163 151 159 271 957 2,560 1,850 741 471 458 376 259
4 165 151 161 280 977 2,670 1,800 714 463 461 375 254
5 164 150 163 293 1,000 2,810 1,760 687 463 460 371 248
6 164 151 163 307 1,060 2,850 1,710 661 466 464 365 245
7 163 152 165 316 1,110 2,890 1,650 644 467 461 368 237
8 162 150 165 318 1,180 2,950 1,600 636 462 461 396 231
9 160 150 167 323 1,240 2,920 1,540 626 461 458 403 225
10 159 150 176 336 1,290 2,820 1,500 614 460 456 395 221
11 156 149 180 347 1,350 2,760 1,460 603 461 452 383 215
12 153 150 180 361 1,380 2,710 1,420 589 462 448 384 211
13 151 150 181 383 1,430 2,690 1,380 577 469 447 385 206
14 150 149 181 410 1,480 2,660 1,350 574 465 445 385 202
15 151 153 183 422 1,530 2,600 1,320 569 465 443 383 197
16 151 157 189 447 1,610 2,600 1,280 558 468 443 376 195
17 151 156 191 468 1,670 2,670 1,240 546 470 448 366 196
18 150 155 197 483 1,740 2,680 1,200 536 473 452 356 194
19 149 154 202 489 1,830 2,670 1,160 525 477 445 347 193
20 148 150 220 512 1,880 2,690 1,120 515 481 442 337 191
21 148 148 231 545 1,940 2,640 1,090 514 484 437 330 188
22 148 149 231 569 2,010 2,540 1,070 511 489 427 322 186
23 149 149 229 598 2,110 2,430 1,040 510 489 418 315 182
24 149 155 223 627 2,190 2,350 1,000 516 491 411 314 178
25 149 159 223 663 2,260 2,270 973 507 484 404 310 175
26 149 155 224 699 2,360 2,220 944 503 483 403 303 171
27 149 153 229 737 2,380 2,170 917 495 472 402 297 168
28 150 152 236 767 2,370 2,100 911 495 463 400 290 167
29 150 159 242 797 2,380 2,050 879 489 458 396 285 166
30 151   247 836 2,390 1,990 842 490 450 394 279 165
31 150   257   2,410   812 491   390   164