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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).

Updated May 12, 2020 - USGS water-resources monitoring will be discontinued May 31, 2020 at the following site:
  • 06088500 Muddy Creek near Vaughn, Montana (POR: 82 years)
USGS monitoring activities at this site were funded by partner entities and USGS Cooperative Matching Funds. Lack of partner funding for this site will result in discontinuation of all USGS monitoring activities. Historical data will continue to be available.

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 -> 2020-09-30)

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
1 162 150 158 262 886 2,460 1,930 785 479 448 384 265
2 162 151 159 262 919 2,490 1,870 762 470 455 381 263
3 163 150 159 269 955 2,570 1,840 739 469 458 376 259
4 165 151 160 279 975 2,680 1,790 712 461 461 375 253
5 164 150 162 292 1,000 2,820 1,750 685 461 459 371 248
6 164 150 163 306 1,050 2,850 1,710 659 464 463 365 244
7 163 151 164 314 1,100 2,890 1,640 642 465 460 367 236
8 162 149 164 316 1,180 2,950 1,590 634 460 461 396 231
9 160 149 166 321 1,230 2,920 1,540 624 459 458 402 225
10 159 149 175 335 1,290 2,810 1,490 612 458 456 395 221
11 156 148 179 346 1,340 2,750 1,450 601 459 452 382 215
12 153 149 179 359 1,380 2,700 1,410 587 461 449 383 211
13 151 149 180 381 1,420 2,680 1,380 575 468 447 384 206
14 150 149 180 408 1,480 2,650 1,340 571 464 445 384 202
15 151 152 181 420 1,530 2,590 1,310 567 464 443 382 197
16 151 157 188 445 1,610 2,600 1,280 556 468 443 375 195
17 150 155 190 465 1,680 2,660 1,230 544 469 448 365 195
18 150 154 195 480 1,750 2,670 1,200 535 472 452 356 194
19 149 153 200 486 1,830 2,660 1,160 523 476 446 347 192
20 148 150 219 510 1,890 2,680 1,120 513 480 442 337 191
21 147 148 230 544 1,940 2,630 1,090 512 482 437 330 188
22 148 148 229 570 2,010 2,530 1,060 510 487 427 322 186
23 148 148 228 600 2,100 2,430 1,040 508 487 418 315 182
24 148 155 221 630 2,180 2,340 998 515 489 412 314 178
25 149 158 222 667 2,260 2,260 969 506 483 405 309 175
26 149 155 223 704 2,360 2,210 940 502 482 404 302 171
27 148 152 228 741 2,380 2,160 913 493 472 402 296 168
28 150 151 234 771 2,370 2,090 906 494 463 400 289 168
29 150 159 240 799 2,390 2,040 875 488 458 396 284 167
30 150   246 838 2,390 1,980 839 488 451 394 279 166
31 150   256   2,420   809 489   391   165