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Around North Fork Big Lost River
Data Source: Recreation.gov · Public land: USGS PAD-US
About this river
North Fork Big Lost River is a 19.0 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
North 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.
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