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USGS Surface-Water 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 -> 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
1 248 244 244 325 403 800 627 160 153 214 297 282
2 252 239 250 324 396 818 592 158 149 221 301 281
3 250 245 255 322 390 821 553 152 147 226 308 278
4 245 251 263 324 394 800 538 146 147 231 309 277
5 245 256 266 336 397 807 518 144 151 243 308 268
6 254 256 293 340 404 849 493 148 154 246 306 261
7 262 247 288 339 429 885 469 153 157 245 301 253
8 260 246 283 355 440 930 450 154 158 247 299 248
9 261 255 287 359 442 957 426 150 169 251 296 249
10 255 249 309 362 456 912 403 146 178 255 296 251
11 248 245 311 359 448 865 387 148 177 257 294 258
12 249 245 302 355 439 825 366 150 173 261 288 265
13 246 257 298 356 438 840 348 148 171 266 287 267
14 242 259 296 358 438 857 354 150 170 271 291 262
15 238 265 301 350 445 819 355 152 174 273 291 261
16 239 270 316 338 477 805 335 153 180 277 292 255
17 250 265 320 333 525 864 316 151 182 282 293 259
18 261 263 318 326 568 893 299 147 181 281 292 264
19 265 257 316 325 584 901 277 145 184 282 289 270
20 255 254 313 333 619 882 259 141 189 288 289 268
21 249 246 307 343 650 861 243 142 190 287 286 266
22 256 240 314 357 642 826 229 144 190 291 279 258
23 254 241 324 373 648 779 216 150 190 292 282 254
24 252 244 320 382 670 738 207 165 190 292 281 258
25 261 239 319 392 722 718 196 164 188 295 282 259
26 262 239 333 399 729 700 186 163 190 296 275 261
27 258 236 342 407 754 668 186 159 192 298 281 263
28 253 236 340 400 758 654 186 156 195 297 293 265
29 249 283 330 390 761 645 180 153 199 295 289 261
30 253   323 391 764 647 169 151 208 298 282 256
31 248   324   772   162 151   300   255