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USGS 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 05017500 St. Mary River near Babb MT


Glacier County, Montana
Hydrologic Unit Code 09040001
Latitude  48°49'59", Longitude 113°25'11" NAD27
Drainage area 275  square miles
Gage datum 4,468.13 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 1950-10-01 -> 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
1 118 112 107 278 927 2,360 2,050 1,170 828 446 293 216
2 115 111 108 292 963 2,360 2,000 1,150 814 441 290 214
3 113 111 109 307 998 2,380 1,960 1,130 795 435 285 212
4 112 111 112 322 1,030 2,430 1,930 1,110 777 423 282 210
5 109 111 114 341 1,060 2,470 1,900 1,090 763 410 276 204
6 108 111 118 359 1,100 2,520 1,860 1,070 752 403 276 199
7 108 110 121 374 1,140 2,590 1,830 1,060 739 392 285 193
8 109 110 126 385 1,200 2,700 1,790 1,050 729 380 325 188
9 110 111 129 398 1,250 2,770 1,740 1,040 722 368 344 183
10 111 111 134 412 1,290 2,660 1,720 1,030 717 359 335 180
11 111 112 140 427 1,340 2,590 1,700 1,020 710 349 320 177
12 111 112 145 443 1,370 2,530 1,670 1,010 698 345 315 173
13 112 111 151 460 1,420 2,480 1,650 1,000 686 343 317 169
14 112 111 154 479 1,470 2,460 1,640 996 674 340 323 163
15 113 110 158 494 1,520 2,430 1,640 990 663 337 327 158
16 113 109 166 510 1,580 2,410 1,610 981 653 336 324 155
17 113 108 178 523 1,650 2,420 1,570 969 640 339 315 152
18 115 107 190 532 1,720 2,430 1,530 958 628 340 305 148
19 115 106 197 547 1,800 2,440 1,500 948 617 337 294 146
20 115 106 202 569 1,890 2,520 1,470 941 609 332 284 144
21 116 106 208 596 1,960 2,510 1,440 936 598 328 273 143
22 116 105 215 627 2,020 2,420 1,420 929 587 325 264 141
23 115 105 221 665 2,080 2,330 1,390 918 569 324 256 137
24 115 105 227 704 2,120 2,270 1,360 912 545 320 253 133
25 115 105 234 743 2,160 2,250 1,320 904 521 313 255 130
26 114 106 243 779 2,210 2,220 1,290 897 506 308 252 126
27 114 105 250 809 2,250 2,190 1,260 888 491 302 247 124
28 114 105 254 836 2,280 2,160 1,240 877 480 295 240 123
29 114 105 257 859 2,300 2,120 1,220 866 467 292 232 122
30 113   262 888 2,320 2,080 1,210 851 452 294 222 121
31 111   269   2,340   1,190 840   296   119