Around here
Around East Fork Big Lost River
Temperature from a 1980 federal survey. The record says nothing about access, ownership or current conditions.
Data Source: Recreation.gov · Source: USGS GNIS · Thermal springs: NOAA NCEI (1980) · Public land: USGS PAD-US · Forest roads: USDA Forest Service MVUM · BLM routes and areas: Bureau of Land Management (simplified for web display)
About this river
East Fork Big Lost River is a 21.1 mile river. Streamflow is measured at the USGS gauge NF Big Lost River at Wild Horse near Chilly ID (site 13120000). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1944 to 2026
East Fork Big Lost River typically runs highest in June, at a median 362 cfs, and lowest in February, at 20 cfs. The highest flow on record for any single day is 1,830 cfs, in 2006.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 22 | 19 to 25 |
| February | 20 | 18 to 23 |
| March | 20 | 18 to 23 |
| April | 45 | 29 to 69 |
| May | 239 | 140 to 368 |
| June | 362 | 236 to 506 |
| July | 154 | 86 to 221 |
| August | 55 | 39 to 74 |
| September | 39 | 30 to 52 |
| October | 35 | 29 to 46 |
| November | 29 | 23 to 34 |
| December | 23 | 20 to 27 |
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 82 years of record. Statistics published by the US Geological Survey for NF Big Lost River at Wild Horse near Chilly ID (site 13120000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Made to print
Put East Fork Big Lost 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 East Fork Big Lost 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.
