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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 06085800 Sun River at Simms MT


Cascade County, Montana
Hydrologic Unit Code 10030104
Latitude  47°30'05.86", Longitude 111°55'54.89" NAD83
Drainage area 1,296  square miles
Gage datum 3,551.08 feet above NAVD88
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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 1965-10-01 -> 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
1 179 198 203 248 530 2,450 811 128 162 163 215 207
2 185 200 203 248 549 2,360 787 133 156 177 218 208
3 185 200 196 245 589 2,240 710 131 150 184 219 213
4 190 201 197 244 615 2,180 693 129 147 189 217 205
5 190 202 200 247 644 2,190 630 131 142 192 218 199
6 189 203 204 256 696 2,400 588 134 140 192 219 201
7 193 203 205 266 752 2,570 511 139 142 190 219 207
8 197 202 214 262 821 2,420 453 151 142 188 223 203
9 197 200 216 272 875 2,300 421 148 141 192 228 197
10 191 201 219 274 919 2,190 379 147 139 194 227 203
11 188 203 215 275 1,030 1,990 333 146 140 193 221 208
12 192 207 221 276 1,110 1,830 288 146 146 196 222 207
13 189 210 220 285 1,060 1,780 258 145 146 202 226 200
14 191 209 224 292 1,090 1,870 235 146 143 209 226 196
15 195 208 228 290 1,150 1,790 213 151 143 215 225 200
16 204 207 238 307 1,110 1,740 200 154 144 217 226 202
17 206 205 243 317 1,180 1,720 183 154 142 215 222 199
18 211 203 247 315 1,290 1,700 179 154 144 215 222 190
19 212 201 233 317 1,350 2,440 175 154 147 222 225 187
20 211 201 242 312 1,330 2,550 182 159 146 221 223 185
21 208 198 263 313 1,290 2,060 175 158 144 221 222 183
22 210 195 262 305 1,280 1,750 160 161 145 222 225 179
23 211 194 259 297 1,290 1,610 148 164 145 221 226 177
24 210 198 253 305 1,370 1,460 139 173 139 218 225 179
25 212 199 250 339 1,510 1,390 134 172 135 218 222 183
26 211 199 250 364 1,760 1,290 129 169 139 220 219 184
27 206 201 250 375 2,030 1,110 129 161 144 221 213 188
28 202 201 247 428 2,140 928 127 154 145 213 209 185
29 201 195 245 477 2,140 786 123 151 146 207 207 188
30 202   244 503 2,210 811 123 152 152 208 205 184
31 200   249   2,420   126 160   209   180