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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 12304500 Yaak River near Troy MT


Lincoln County, Montana
Hydrologic Unit Code 17010103
Latitude  48°33'42.20", Longitude 115°58'12.57" NAD83
Drainage area 792  square miles
Gage datum 1,839 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
1 247 295 381 1,060 2,710 2,960 861 237 151 160 247 394
2 240 303 375 1,090 2,780 2,900 819 233 151 159 256 378
3 243 301 378 1,130 2,860 2,870 777 229 149 159 264 368
4 241 299 387 1,180 2,900 2,750 737 221 147 157 289 431
5 234 297 396 1,270 2,970 2,660 693 215 147 156 291 408
6 231 298 407 1,370 3,110 2,570 658 211 146 156 278 369
7 237 315 419 1,480 3,200 2,450 629 207 145 154 291 343
8 265 335 434 1,490 3,220 2,350 599 202 141 156 286 306
9 261 393 429 1,540 3,240 2,260 572 197 141 164 282 323
10 273 362 449 1,590 3,270 2,140 553 191 140 166 280 320
11 263 334 481 1,600 3,280 2,030 529 187 141 170 292 329
12 256 318 507 1,640 3,300 1,970 500 185 141 178 303 319
13 264 313 536 1,670 3,350 1,930 488 181 139 179 313 320
14 265 311 545 1,740 3,380 1,910 484 177 141 182 313 318
15 297 314 584 1,760 3,470 1,860 462 176 149 189 341 312
16 398 322 684 1,740 3,610 1,810 435 177 154 189 319 322
17 403 327 696 1,740 3,670 1,760 413 173 146 188 300 311
18 351 326 677 1,790 3,660 1,680 397 171 154 183 294 300
19 322 336 710 1,830 3,590 1,560 383 166 157 180 281 291
20 305 362 722 1,940 3,520 1,470 368 163 158 179 287 282
21 288 385 710 2,060 3,530 1,410 353 161 160 189 301 278
22 279 382 698 2,110 3,560 1,360 337 161 160 195 303 282
23 275 390 722 2,220 3,530 1,290 324 162 158 203 305 273
24 271 370 761 2,430 3,440 1,210 312 164 155 199 353 261
25 272 372 815 2,500 3,380 1,140 304 163 153 213 422 252
26 266 377 843 2,450 3,340 1,080 299 161 153 217 377 269
27 264 371 859 2,440 3,310 1,050 290 157 153 220 340 298
28 264 368 885 2,490 3,240 1,000 276 154 155 227 314 281
29 266 437 919 2,540 3,130 951 264 152 155 224 339 257
30 275   977 2,610 3,110 918 255 150 155 221 372 251
31 287   1,030   3,050   247 150   235   247