River MT

North Fork Blackfoot River

Montana • 46.9799, -113.1000

Hydrography profile Updated Dec 26, 2025

Checking mapped path coverage…

USGS and NOAA data is for informational purposes. Source notes

Length

40 mi

64 km

Elevation

7,495′ → 4,027′

3,468 ft drop

Stream Order

Large River

Slope

1.66%

87.6 ft/mi

Drainage

291 mi²

755 km²

Avg Flow

388 cfs

1.5 mph velocity

Path to Mouth

1,205 mi

1,940 km to ocean

Classification

Headwater

Source Stream

Elevation Profile

Water Quality

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

Data from USGS & NOAA for informational purposes only. More

Access Sites on North Fork Blackfoot River

There are 3 boat ramps, launches, and public access points on North Fork Blackfoot River.