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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 12324400 Clark Fork ab Little Blackfoot R nr Garrison MT


Powell County, Montana
Hydrologic Unit Code 17010201
Latitude  46°30'39.28", Longitude 112°47'22.87" NAD83
Drainage area 1,130  square miles
Gage datum 4,350 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 2008-10-01 -> 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
1 244 242 245 325 395 763 598 154 148 207 291 277
2 248 239 251 324 388 778 566 152 144 215 295 276
3 248 244 255 322 382 782 529 146 142 219 301 273
4 244 248 263 324 384 765 514 140 143 224 302 272
5 243 252 266 336 388 772 495 139 146 235 302 264
6 251 252 293 340 394 811 471 143 150 238 299 257
7 259 245 288 339 418 844 448 147 152 238 294 250
8 256 245 283 355 427 887 430 148 154 240 292 246
9 258 253 287 359 428 913 406 144 163 243 290 247
10 251 247 309 362 441 873 385 141 172 247 291 248
11 246 242 311 359 433 831 370 143 171 250 289 255
12 247 241 302 355 423 790 350 145 168 254 283 262
13 243 251 298 356 423 803 332 144 167 259 282 263
14 239 254 296 358 423 818 338 145 166 263 286 259
15 235 261 301 350 430 782 339 147 170 266 285 258
16 237 265 316 338 460 770 320 148 176 269 286 252
17 249 262 320 333 506 825 302 146 177 274 288 256
18 257 261 318 326 545 853 286 143 178 274 287 261
19 260 256 316 325 559 860 265 140 181 274 283 266
20 246 254 313 333 592 841 248 137 185 280 283 264
21 239 247 307 343 621 820 233 138 186 279 282 263
22 249 241 314 357 613 786 219 139 185 283 276 255
23 251 245 324 373 622 741 207 145 186 284 278 251
24 249 254 320 382 645 703 199 159 185 284 278 256
25 256 249 319 392 692 683 189 159 183 287 277 256
26 257 246 333 399 698 665 179 158 185 289 271 258
27 253 240 342 407 720 637 179 154 187 291 277 260
28 248 238 340 400 723 626 179 151 190 289 288 262
29 244 283 330 390 726 617 173 148 194 287 283 258
30 248   323 391 730 617 163 146 202 290 276 253
31 245   324   737   156 147   293   252