Around here
Around Sun River
Data Source: Recreation.gov · Source: USGS GNIS · Public land: USGS PAD-US
About this river
Sun River is a 35.8 mile river. Streamflow is measured at the USGS gauge Sun River at Simms MT (site 06085800). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1966 to 2026
Sun River typically runs highest in June, at a median 1,155 cfs, and lowest in July, at 112 cfs. The highest flow on record for any single day is 35,000 cfs, in 1975.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 185 | 142 to 250 |
| February | 195 | 140 to 250 |
| March | 182 | 137 to 261 |
| April | 209 | 131 to 329 |
| May | 606 | 125 to 1,750 |
| June | 1,155 | 367 to 2,495 |
| July | 112 | 74 to 195 |
| August | 129 | 80 to 191 |
| September | 131 | 95 to 175 |
| October | 190 | 159 to 232 |
| November | 196 | 160 to 245 |
| December | 180 | 135 to 233 |
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 43 years of record. Statistics published by the US Geological Survey for Sun River at Simms MT (site 06085800). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Made to print
Put Sun 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 Sun 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.
