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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 06200000 Boulder River at Big Timber MT


Sweet Grass County, Montana
Hydrologic Unit Code 10070002
Latitude  45°50'01.66", Longitude 109°56'19.34" NAD83
Drainage area 525  square miles
Gage datum 4,056.3 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 1947-10-01 -> 2023-09-30)

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
1 135 128 123 147 402 2,320 2,370 389 166 201 214 175
2 136 127 123 150 434 2,350 2,270 372 165 204 208 174
3 137 127 123 147 456 2,470 2,220 350 162 205 209 172
4 137 127 122 146 489 2,660 2,160 333 160 209 210 171
5 139 127 122 148 506 2,860 2,080 317 157 210 207 164
6 137 124 127 153 542 3,060 1,970 299 158 212 208 162
7 137 123 126 158 597 3,070 1,900 283 159 213 206 162
8 136 124 127 163 653 3,000 1,810 267 157 213 210 161
9 137 124 127 167 686 2,920 1,700 253 159 214 207 159
10 140 127 128 173 706 2,920 1,620 240 162 214 202 165
11 139 129 127 178 738 2,830 1,550 230 167 216 199 167
12 139 131 128 183 768 2,760 1,430 222 176 218 197 169
13 141 132 128 183 830 2,850 1,340 217 178 217 199 164
14 142 131 129 187 870 2,910 1,270 211 176 218 200 161
15 143 131 128 193 934 2,840 1,180 203 175 221 193 158
16 140 134 129 196 993 2,880 1,090 198 174 225 195 154
17 137 137 131 200 1,100 2,920 1,010 193 174 228 197 150
18 138 135 133 207 1,170 2,880 936 189 175 227 195 147
19 135 134 134 218 1,250 2,900 875 189 185 225 193 150
20 134 132 133 229 1,360 2,860 831 187 192 225 192 147
21 136 131 135 243 1,490 2,820 772 188 195 225 187 150
22 134 129 137 257 1,540 2,810 718 188 197 225 180 149
23 136 129 136 282 1,600 2,770 671 188 193 222 179 145
24 136 127 138 297 1,650 2,740 626 191 194 221 186 142
25 135 126 137 311 1,760 2,700 590 186 194 219 186 144
26 133 124 138 319 1,830 2,630 557 183 193 219 182 145
27 131 125 140 327 1,930 2,590 519 175 196 217 177 143
28 129 125 139 335 2,090 2,540 485 171 198 215 175 144
29 130 124 139 349 2,200 2,470 458 171 195 215 174 144
30 128   142 368 2,220 2,420 441 171 193 210 174 140
31 129   145   2,250   414 169   218   139