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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 12344000 Bitterroot River near Darby MT


Ravalli County, Montana
Hydrologic Unit Code 17010205
Latitude  45°58'19.38", Longitude 114°08'28.44" NAD83
Drainage area 1,050  square miles
Gage datum 3,942.14 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 1936-10-01 -> 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
1 239 263 283 551 1,650 3,820 1,740 510 389 324 330 295
2 239 262 287 574 1,690 3,770 1,660 500 385 327 332 307
3 242 258 292 583 1,780 3,860 1,600 489 380 328 330 308
4 240 256 292 602 1,890 3,880 1,540 479 374 326 330 296
5 246 255 292 630 1,980 3,860 1,470 471 371 322 331 278
6 250 251 300 660 2,060 3,860 1,390 464 377 321 327 274
7 254 259 299 692 2,170 3,790 1,330 458 379 321 355 272
8 258 269 302 724 2,270 3,670 1,260 447 380 319 361 268
9 253 277 305 748 2,340 3,530 1,200 438 378 323 329 265
10 249 276 320 766 2,420 3,410 1,150 434 368 324 324 273
11 247 272 324 784 2,510 3,290 1,100 432 362 326 317 277
12 244 270 325 809 2,560 3,210 1,040 433 357 337 310 279
13 248 267 335 838 2,650 3,230 992 431 360 339 318 284
14 250 266 340 888 2,770 3,130 947 430 354 339 309 283
15 251 263 346 936 2,880 3,070 892 424 359 337 302 283
16 251 266 361 952 3,060 3,010 847 421 357 342 301 278
17 256 266 370 979 3,240 2,970 808 415 355 341 300 270
18 253 265 374 1,030 3,360 2,870 774 411 357 333 303 264
19 250 267 383 1,090 3,470 2,790 739 409 354 332 302 263
20 246 274 388 1,160 3,570 2,720 711 413 352 328 300 262
21 242 277 397 1,210 3,570 2,630 679 411 350 326 295 266
22 245 278 411 1,260 3,540 2,550 651 410 345 335 288 266
23 246 273 431 1,310 3,560 2,450 626 419 341 351 295 271
24 246 274 439 1,360 3,640 2,370 600 418 335 342 315 264
25 243 275 445 1,380 3,670 2,270 585 408 329 342 309 256
26 237 281 460 1,390 3,770 2,160 563 404 326 345 304 257
27 239 281 466 1,410 3,870 2,080 549 398 320 337 297 258
28 237 280 474 1,450 3,920 1,970 543 392 319 337 289 254
29 237 307 487 1,510 3,980 1,900 532 390 318 336 284 252
30 239   503 1,590 3,990 1,830 525 387 318 328 291 252
31 251   525   3,910   523 387   330   249