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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
1 200 181 179 302 1,940 4,020 1,680 500 298 322 361 293
2 196 182 176 309 2,010 4,020 1,590 487 298 311 354 322
3 196 180 175 323 2,100 4,080 1,520 476 294 298 347 301
4 198 181 176 341 2,230 4,060 1,450 460 288 291 361 295
5 198 182 179 361 2,380 3,990 1,380 446 285 289 374 280
6 198 184 180 391 2,540 3,910 1,320 433 287 283 385 279
7 198 188 181 414 2,610 3,840 1,260 422 285 281 434 285
8 197 190 183 445 2,680 3,670 1,210 413 282 281 439 268
9 196 187 184 480 2,790 3,500 1,150 414 281 281 383 268
10 197 180 186 522 2,870 3,340 1,100 405 276 284 384 271
11 191 178 189 551 2,980 3,240 1,050 396 274 282 432 268
12 190 175 193 584 3,120 3,160 1,010 388 271 281 393 266
13 189 173 197 612 3,330 3,160 989 379 271 283 442 260
14 187 171 198 659 3,390 3,150 976 370 270 287 419 254
15 186 171 210 700 3,410 3,040 934 362 270 304 420 251
16 189 172 228 756 3,550 2,990 882 354 271 319 396 245
17 196 171 222 806 3,680 3,030 840 350 273 324 357 240
18 195 171 222 907 3,810 2,950 809 342 280 322 337 236
19 194 173 226 960 3,840 2,780 779 333 283 333 326 232
20 200 173 227 1,030 3,930 2,710 745 330 284 352 325 231
21 201 172 227 1,120 4,000 2,610 714 328 286 342 321 227
22 197 172 227 1,230 4,100 2,460 685 321 286 335 311 226
23 196 174 228 1,310 4,150 2,350 662 322 283 331 308 220
24 195 173 232 1,410 4,190 2,250 639 324 280 325 316 216
25 195 175 246 1,490 4,220 2,150 618 320 281 340 308 217
26 190 188 254 1,540 4,300 2,050 602 317 288 358 301 223
27 186 184 256 1,550 4,280 1,970 581 312 285 356 302 232
28 181 181 268 1,650 4,170 1,860 563 305 280 382 302 233
29 179 176 281 1,770 4,110 1,780 549 300 278 389 295 222
30 180   287 1,860 4,100 1,740 535 298 292 372 287 212
31 182   298   4,090   519 300   362   206