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USGS Daily Statistics for the Nation

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 12355000 Flathead River at Flathead British Columbia


000, British Columbia
Hydrologic Unit Code --
Latitude  49°00'04.47", Longitude 114°28'32.39" NAD83
Drainage area 429  square miles
Gage datum 3,968.16 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 1928-10-01 -> 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
1 201 182 179 301 1,940 4,030 1,690 499 298 322 361 293
2 197 183 177 308 2,010 4,030 1,600 486 298 311 354 322
3 197 181 175 322 2,090 4,100 1,530 476 294 298 347 301
4 199 182 177 342 2,220 4,080 1,460 459 288 291 361 298
5 199 183 180 362 2,370 4,010 1,390 446 285 289 374 282
6 199 185 182 391 2,530 3,940 1,330 433 287 283 385 281
7 199 189 183 415 2,610 3,860 1,270 422 285 281 434 288
8 199 191 184 446 2,680 3,690 1,220 413 282 281 439 271
9 197 188 185 481 2,790 3,530 1,150 414 281 281 383 270
10 198 181 187 523 2,870 3,360 1,100 405 276 284 384 273
11 192 179 190 552 2,980 3,250 1,060 396 274 282 432 270
12 192 176 194 583 3,110 3,180 1,020 388 271 281 393 268
13 191 174 198 612 3,330 3,180 995 379 271 283 442 262
14 188 172 199 660 3,390 3,170 982 370 270 287 419 256
15 187 172 212 701 3,410 3,060 932 362 270 304 420 253
16 190 173 229 757 3,550 3,010 878 354 271 319 396 246
17 198 172 223 807 3,690 3,050 839 350 273 324 357 242
18 196 172 223 909 3,820 2,980 809 342 280 322 337 238
19 196 174 228 963 3,860 2,800 780 333 283 333 326 233
20 201 174 229 1,030 3,950 2,730 746 330 284 352 325 233
21 202 173 229 1,120 4,020 2,620 715 328 286 342 321 228
22 198 173 229 1,230 4,120 2,470 685 321 286 335 311 228
23 197 175 230 1,320 4,180 2,360 658 322 283 331 308 221
24 197 174 234 1,420 4,220 2,270 637 324 280 325 316 217
25 196 176 247 1,500 4,240 2,160 617 320 281 340 308 219
26 191 189 255 1,540 4,310 2,060 601 317 288 358 301 225
27 187 185 256 1,550 4,290 1,980 580 312 285 356 302 233
28 182 181 267 1,650 4,180 1,870 563 305 280 382 302 234
29 180 176 280 1,780 4,120 1,790 549 300 278 389 295 223
30 181   286 1,850 4,110 1,750 536 298 292 372 287 213
31 183   296   4,100   519 300   362   207