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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 -> 2022-09-30)

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
1 199 180 177 302 1,950 4,090 1,700 504 298 327 367 267
2 194 182 174 310 2,020 4,090 1,610 491 300 315 359 267
3 194 180 173 323 2,090 4,160 1,540 481 295 302 353 270
4 197 179 175 341 2,220 4,130 1,470 464 289 295 368 274
5 197 181 179 362 2,360 4,050 1,400 450 286 293 379 265
6 197 182 181 393 2,510 3,970 1,340 438 289 287 391 252
7 197 187 183 417 2,610 3,900 1,280 425 287 285 442 245
8 197 190 185 449 2,690 3,720 1,230 416 284 285 448 239
9 195 186 187 485 2,810 3,550 1,160 418 283 286 390 248
10 197 180 189 529 2,900 3,360 1,110 408 278 289 391 256
11 192 177 191 556 3,000 3,240 1,070 399 276 286 442 255
12 191 175 195 587 3,130 3,170 1,030 391 274 286 401 256
13 190 173 200 616 3,330 3,180 1,000 382 273 287 452 252
14 188 172 200 663 3,400 3,180 993 373 272 291 428 247
15 186 172 213 702 3,420 3,070 942 365 272 309 429 245
16 190 173 231 757 3,560 3,040 888 357 273 325 404 239
17 197 172 225 810 3,680 3,080 848 353 275 330 365 236
18 196 171 225 918 3,830 2,990 818 345 283 328 344 233
19 196 171 230 975 3,890 2,810 788 336 286 339 333 228
20 201 172 230 1,050 3,990 2,750 754 333 288 359 331 227
21 202 173 230 1,140 4,080 2,640 722 331 289 349 328 223
22 197 174 230 1,260 4,180 2,490 692 324 289 340 316 221
23 197 176 231 1,350 4,240 2,380 665 324 286 336 314 214
24 196 174 234 1,450 4,290 2,280 643 326 284 330 322 212
25 196 176 248 1,530 4,310 2,180 624 322 284 346 314 218
26 191 189 256 1,570 4,380 2,090 607 319 292 364 307 223
27 186 185 257 1,580 4,360 2,000 586 314 288 362 307 231
28 181 181 268 1,680 4,230 1,890 569 307 283 389 308 232
29 179 173 281 1,800 4,160 1,800 554 302 282 397 300 220
30 179   286 1,880 4,160 1,770 541 299 296 379 283 210
31 181   297   4,160   525 299   368   205