Nf Big Lost River at Wild Horse near Chilly ID

Custer County, Idaho · USGS gauge 13120000 · NWS BLRI1 · Idaho river levels

Is Nf Big Lost River at Wild Horse near Chilly ID flooding right now?

Nf Big Lost River at Wild Horse near Chilly ID measured 1.51 ft on 2026-09-11 01:15:00 UTC. That observation was 3.6 ft below its 5.11 ft flood stage. This is the latest available reading, not a guarantee of current conditions.

Gauge height

1.51 ft

as of 65 min ago

Streamflow

29 cfs

data refreshed 2 min ago

Minor flooding here begins at 5.11 ft. The highest crest on record was 6.41 ft on Sun, May 21, 2006.

Streamflow outlook

NOAA National Water Model forecast, issued 14 hours ago. The NWM models discharge for every river reach in the country, including the many gauges the National Weather Service does not forecast individually. It is a model, not an official NWS river forecast, and it predicts flow rather than water level.

Flood stages at this gauge

Category	Stage	Current distance
Action	4.75 ft	3.2 ft below
Minor flood	5.11 ft	3.6 ft below

New to these numbers? What does flood stage mean? · How to read a river gauge · Why is the river rising?

Highest crests on record

Stage	Date
6.41 ft	2006-05-21
6.39 ft	1965-06-12
6.23 ft	1967-05-25
6.18 ft	1956-05-24
6.02 ft	2017-06-05

Nearby gauges

Gauge	Distance	County
Big Lost River at Howell Ranch near Chilly ID	6.5 mi	Custer County
Warm Springs Creek below Diversion near Mackay ID	16.1 mi	Custer County
Thousand Springs Creek near Chilly ID	16.4 mi	Custer County
Trail Creek near Sun Valley, ID	17.8 mi	Blaine County
Nf Big Wood River near Sawtooth Nra Hq near Ketchum ID	18.2 mi	Blaine County

Provisional data: Real-time readings are provisional and subject to revision by the USGS — sensors can be affected by ice, debris, or equipment malfunction. Do not rely on this site for decisions involving personal safety; follow official guidance from the National Weather Service and local authorities.

Sources: USGS monitoring location · NWS gauge & forecast