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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 -> 2024-09-30)

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
1 248 298 382 1,050 2,720 2,960 861 237 151 161 249 398
2 241 306 377 1,080 2,780 2,900 819 233 151 160 258 382
3 244 304 380 1,130 2,860 2,870 777 229 149 160 266 372
4 242 302 389 1,180 2,900 2,750 737 221 147 158 291 437
5 235 300 397 1,280 2,970 2,660 693 215 147 157 294 413
6 232 301 409 1,380 3,120 2,570 658 211 146 156 280 373
7 239 318 421 1,480 3,210 2,450 629 207 145 154 294 347
8 267 338 436 1,490 3,240 2,350 599 202 141 157 288 308
9 263 397 431 1,540 3,250 2,260 572 197 141 165 285 326
10 275 366 451 1,590 3,290 2,140 553 191 140 167 283 322
11 265 338 484 1,600 3,290 2,030 529 187 141 171 294 332
12 258 322 510 1,640 3,310 1,970 500 185 141 179 305 322
13 266 316 539 1,670 3,360 1,930 488 181 139 180 316 323
14 267 314 547 1,750 3,400 1,910 484 177 141 184 315 321
15 300 316 587 1,770 3,480 1,860 462 176 149 191 343 315
16 402 325 689 1,750 3,620 1,810 435 177 154 191 321 325
17 408 330 701 1,740 3,690 1,760 413 173 146 189 302 314
18 354 329 682 1,800 3,690 1,680 397 171 154 185 295 302
19 325 339 716 1,830 3,610 1,560 383 166 157 181 283 292
20 309 365 728 1,950 3,540 1,470 368 163 158 180 289 284
21 291 389 716 2,060 3,560 1,410 353 161 160 190 303 280
22 282 386 703 2,120 3,590 1,360 337 161 160 195 305 284
23 278 393 727 2,240 3,570 1,290 324 162 158 204 307 275
24 274 372 763 2,450 3,470 1,210 312 164 156 200 356 262
25 274 374 810 2,510 3,410 1,140 304 163 154 215 426 253
26 268 378 837 2,460 3,360 1,080 299 161 154 218 380 270
27 266 372 847 2,450 3,330 1,050 290 157 154 221 343 300
28 266 370 869 2,500 3,260 1,000 276 154 155 228 317 283
29 268 437 905 2,540 3,130 951 264 152 156 226 342 258
30 277   967 2,620 3,110 918 255 150 156 222 375 252
31 290   1,030   3,050   247 150   237   248