Boise, S. Fork

1. Anderson Ranch Dam to Danskin Bridge(Upper Run)

DifficultyI-II(III)
Length10.9 mi
Avg Gradientn/a
GaugeSf Boise River at Anderson Ranch Dam Id
Flow Rate as of 1 hour
1610 cfsrunnable
Reach Info Last UpdatedAugust 7, 2025

River Description

Class I-III Rapids (Flow dependent)


River Features

Put In

Distance: 0 mi

Take Out

Distance: 10 mi
Take Out

BT
Bill Tanger

Jul 4, 2010


Floated the South Fork June 21, 2010. Level 2500 cfs. Kayaker swam above logjam but made it to shore. Raft picked up kayak downstream. Kayaker unable to hike along shore as canyon extremely steep without shore. Kayaker had to swim downstream, towed by canoeist, to get to kayak. Water temp 35 degrees, without sun due to canyon walls. Very dangerous section due to cold water, lack of shoreline to use, lack of escape from 10 mile-long canyon and continuous Class III + at that level. --- Bill Tanger, FORVA, Roanoke VA