Around here
Around Lamar River
Before you go
- Timed entryTower Junction to Slough Creek Road Corridor Vehicle Day-Use Tickets
Data Source: Recreation.gov · Source: USGS GNIS · Public land: USGS PAD-US
About this river
Lamar River is a 43.8 mile river near Yellowstone Fly Fishing Co. in Montana. Streamflow is measured at the USGS gauge Lamar River nr Tower Ranger Station YNP (site 06188000). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1923 to 2026
Lamar River typically runs highest in June, at a median 3,940 cfs, and lowest in January, at 100 cfs. The highest flow on record for any single day is 23,800 cfs, in 2022.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 100 | 90 to 120 |
| February | 100 | 90 to 120 |
| March | 110 | 95 to 138 |
| April | 270 | 191 to 664 |
| May | 2,870 | 1,560 to 3,950 |
| June | 3,940 | 2,910 to 5,480 |
| July | 976 | 626 to 1,470 |
| August | 273 | 221 to 358 |
| September | 193 | 156 to 256 |
| October | 183 | 148 to 254 |
| November | 149 | 120 to 183 |
| December | 120 | 100 to 140 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 84 years of record. Statistics published by the US Geological Survey for Lamar River nr Tower Ranger Station YNP (site 06188000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Made to print
Put Lamar River on your wall
This river section as an art print, drawn over the real terrain with its miles, plus the trails, roads and peaks around it. Pick the colors and the size, and see the finished print before you buy. From $39, shipping included.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Lamar River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
See every free widget you can put on your site, including live conditions and a 7 day forecast.
