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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 06188000 Lamar River nr Tower Ranger Station YNP


Park County, Wyoming
Hydrologic Unit Code 10070001
Latitude  44°55'41.44", Longitude 110°23'39.37" NAD83
Drainage area 668  square miles
Gage datum 6,000 feet above NAVD88
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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 1922-10-01 -> 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
1 115 104 110 177 1,170 4,790 2,680 489 239 218 201 137
2 114 104 110 184 1,240 4,810 2,540 477 238 217 193 137
3 114 106 111 192 1,370 4,830 2,430 463 238 218 191 134
4 114 106 112 208 1,520 4,900 2,330 450 226 222 190 132
5 114 106 112 219 1,640 5,120 2,200 433 222 216 186 128
6 114 106 112 222 1,770 5,220 2,070 409 218 222 186 126
7 113 106 112 225 1,930 5,100 1,960 394 219 225 183 126
8 114 106 114 238 2,010 4,930 1,850 380 213 229 189 126
9 113 106 115 253 2,110 4,790 1,730 373 217 222 188 125
10 113 106 117 267 2,150 4,710 1,640 365 219 219 181 126
11 111 106 119 296 2,220 4,600 1,550 361 220 221 174 126
12 109 108 121 319 2,370 4,590 1,460 351 218 221 170 126
13 110 108 121 346 2,560 4,780 1,350 347 219 218 168 125
14 110 106 123 391 2,660 4,620 1,280 331 212 216 165 125
15 109 107 123 415 2,840 4,470 1,190 316 216 218 164 125
16 108 107 128 429 3,070 4,520 1,100 311 215 225 163 122
17 107 107 130 449 3,280 4,380 1,030 303 219 222 160 120
18 107 109 132 478 3,390 4,240 964 303 231 217 157 119
19 109 109 136 516 3,550 4,150 916 304 243 217 159 120
20 108 109 142 587 3,710 4,040 876 307 238 219 157 121
21 107 109 145 685 3,890 3,900 826 299 240 212 152 121
22 107 109 143 759 3,940 3,850 765 293 235 208 147 120
23 106 108 142 825 3,970 3,750 726 284 227 206 146 119
24 107 108 140 845 4,030 3,640 701 277 229 203 150 120
25 109 108 144 863 4,180 3,490 660 268 224 204 148 119
26 110 109 148 878 4,230 3,390 636 269 218 207 145 119
27 109 109 149 915 4,350 3,310 604 261 223 205 144 119
28 107 110 150 975 4,530 3,090 579 251 218 205 141 119
29 107 112 151 1,070 4,760 2,920 556 247 216 209 140 118
30 107   151 1,150 4,770 2,820 536 242 219 204 141 118
31 107   158   4,690   509 246   209   117