Around here
Around Boulder 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
Boulder River is a 57.1 mile river near Rubber Ducky River Rentals in Montana. Streamflow is measured at the USGS gauge Boulder River at Big Timber MT (site 06200000). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1948 to 2025
Boulder River typically runs highest in June, at a median 2,630 cfs, and lowest in February, at 125 cfs. The highest flow on record for any single day is 9,140 cfs, in 2022.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 135 | 110 to 160 |
| February | 125 | 108 to 145 |
| March | 126 | 110 to 145 |
| April | 175 | 143 to 235 |
| May | 867 | 487 to 1,490 |
| June | 2,630 | 1,790 to 3,475 |
| July | 890 | 471 to 1,470 |
| August | 167 | 96 to 274 |
| September | 142 | 89 to 238 |
| October | 210 | 161 to 270 |
| November | 193 | 162 to 229 |
| December | 159 | 128 to 184 |
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 76 years of record. Statistics published by the US Geological Survey for Boulder River at Big Timber MT (site 06200000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
2 mapped launches sit in the mapped area of Boulder River, all of them public access. Ramp data comes from the USGS national boat-ramp inventory.
- Springdale BridgeYellowstone RiverPublic
- Grey BearYellowstone RiverPublic
Made to print
Put Boulder 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 Boulder 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.
