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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 12324200 Clark Fork at Deer Lodge MT


Powell County, Montana
Hydrologic Unit Code 17010201
Latitude  46°23'51.54", Longitude 112°44'33.14" NAD83
Drainage area 1,001  square miles
Gage datum 4,502.2 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 1978-10-01 -> 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
1 227 222 231 263 318 558 411 113 136 199 251 238
2 224 221 232 264 317 562 394 111 135 205 253 240
3 222 217 234 264 320 560 379 107 133 207 258 241
4 220 216 236 266 326 563 371 104 134 212 260 242
5 224 216 236 269 323 567 353 105 137 219 260 235
6 223 217 252 275 322 602 336 103 140 221 263 233
7 226 222 261 277 332 620 319 103 143 220 263 228
8 231 232 257 279 333 620 304 102 147 224 264 225
9 226 234 264 281 337 616 291 99 152 224 265 224
10 221 226 273 279 343 589 289 97 154 226 259 224
11 218 221 276 280 348 586 282 99 156 230 258 226
12 215 222 278 282 339 577 265 102 161 232 258 227
13 217 231 276 282 338 572 255 101 161 234 260 228
14 216 238 271 284 339 572 249 102 162 237 257 226
15 215 240 270 282 344 557 236 101 165 241 253 224
16 212 243 271 276 363 561 220 103 166 245 254 220
17 217 245 271 272 389 582 207 104 167 247 255 222
18 222 241 267 276 406 585 200 105 169 248 257 216
19 225 240 264 283 418 580 191 107 172 249 256 214
20 221 245 261 288 432 571 187 106 178 250 256 216
21 217 252 260 293 442 559 175 110 179 250 252 216
22 217 243 263 296 476 548 163 115 178 252 249 216
23 218 238 263 303 491 533 155 120 180 252 245 213
24 217 253 262 313 492 514 147 124 180 251 243 211
25 220 255 264 318 507 487 140 126 181 252 242 211
26 219 239 269 316 523 466 135 128 181 254 241 210
27 225 231 273 313 530 452 133 129 185 256 240 211
28 219 230 268 310 537 437 129 128 189 255 241 212
29 215 244 264 308 539 426 126 127 190 255 241 212
30 219   261 314 547 419 120 128 193 255 238 214
31 223   262   554   116 130   253   217