River ID

Lake Fork

Idaho • 44.9132, -115.9949

Hydrography profile Updated Dec 30, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

29 mi

47 km

Elevation

5,318′ → 4,820′

499 ft drop

Stream Order

Medium River

Slope

0.32%

17.0 ft/mi

Drainage

110 mi²

286 km²

Avg Flow

-- cfs

0.9 mph velocity

Path to Mouth

850 mi

1,368 km to ocean

Classification

Tributary

Mid-reach

Elevation Profile

Water Quality

Data from EPA Water Quality Portal (USGS, EPA, state agencies).

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Data from USGS & NOAA for informational purposes only. Read source and safety notes

Access Sites on Lake Fork

There are 2 boat ramps, launches, and public access points on Lake Fork.