Big Lost River - Lower

Custer County

Updated August 18, 2026

IDFG Access SitesActive

Current conditions

Big Lost River below Mackay Res near Mackay ID

Nearest gauge · 0.1 mi

Live19 minutes ago

Flow

cfs

Gage height

0ft

Seasonal Flow

Normal

74th percentile for Sep 5 · 112-yr record

Flow · 2 weeks + 7-day forecast

Holding near ~316 cfs by Sep 12 · issued Sep 5, 2026, 10:22 AM MDT · NOAA

Site photos

Site facts

CountyCuster

Region6

Campyes

RestroomADA

Rampno

Dockno

ADA fishingyes

Fishing / BoatingFishing

Coordinates43.94085, -113.65016

Camping is limited to no more than 10 days within any 30 day period. Much of the surrounding area is private property; please obey all signs and markers. Pets must be on a leash at all times. Please pack out what you pack in.

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Data: Idaho Fish & Game · Source id idfg_access:214

Current conditions

Site photos

Site facts

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