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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 12389500 Thompson River near Thompson Falls MT


Sanders County, Montana
Hydrologic Unit Code 17010213
Latitude  47°35'30.69", Longitude 115°13'46.33" NAD83
Drainage area 638  square miles
Gage datum 2,429.97 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 1956-10-01 -> 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
1 170 214 260 512 1,000 1,290 557 261 193 172 175 209
2 172 210 260 524 1,020 1,270 537 259 192 171 176 210
3 173 206 264 534 1,050 1,270 521 254 190 171 177 213
4 171 205 267 546 1,070 1,260 504 251 188 171 180 217
5 171 211 265 559 1,110 1,220 487 248 187 169 180 216
6 172 209 272 593 1,150 1,190 472 244 186 169 180 206
7 177 210 275 634 1,180 1,160 458 242 185 169 185 197
8 184 219 278 650 1,190 1,150 443 238 184 169 185 191
9 184 265 280 670 1,190 1,150 429 234 183 169 183 190
10 187 266 291 688 1,210 1,070 418 231 182 169 183 189
11 183 250 296 694 1,230 1,020 407 229 181 170 184 191
12 178 239 303 700 1,250 990 395 226 181 174 189 193
13 182 231 316 706 1,260 983 387 224 180 174 195 194
14 185 229 321 730 1,270 976 380 222 179 172 191 198
15 197 226 338 745 1,290 948 368 220 180 172 185 198
16 241 231 369 737 1,340 931 358 220 180 171 186 192
17 241 234 377 735 1,380 914 349 216 178 170 185 188
18 225 231 381 745 1,390 888 341 214 179 169 185 187
19 213 233 407 752 1,380 851 334 211 180 169 183 184
20 207 248 402 789 1,370 825 326 210 180 168 182 181
21 202 267 399 841 1,360 795 318 210 178 168 185 180
22 198 265 396 865 1,370 771 312 208 178 170 186 181
23 195 257 403 887 1,370 745 305 207 177 171 189 182
24 191 249 410 950 1,370 718 299 205 175 170 201 181
25 195 248 413 978 1,370 693 295 203 174 171 214 179
26 190 250 424 959 1,380 664 289 201 173 173 213 182
27 189 251 435 951 1,380 637 283 200 172 173 201 186
28 188 255 443 965 1,360 614 277 199 172 174 193 182
29 187 294 453 970 1,340 596 273 196 171 174 196 175
30 193   466 983 1,330 578 268 195 171 173 208 174
31 212   493   1,320   264 194   174   172