Idaho · Tailwater · Rockies
South Fork Boise — Anderson Ranch
Tailwater below Anderson Ranch Dam; generation and canyon access matter.
Idaho · public-access reaches. This page is what the desk knows about the water itself. What it is doing today — flow, water temperature, weather, and the hazards those produce — is a reading with a date on it, and it lives in Trip Prep.
Plan a trip on South Fork Boise — Anderson RanchStores this page so it opens with no signal. Live flow and weather are never stored.
Who manages it
Idaho Department of Fish and Game
These links were checked against the live agency site on 2026-09-01. Rules for a water change inside a season, so the agency’s own page on the day you go is the only current answer — this desk does not hold one.
Directory review
Review provenance unavailable
The fleet directory holds no record by this name in Idaho, so there is no directory review to show.
The agency links on this page were checked on 2026-09-01; check the agency’s own page the day you go.
How access works here
Access concentrated below the dam
On a tailwater, public access clusters below the dam and thins downstream. The outlet reach is usually the busiest water on the river and the most exposed to a release.
Launch · There is usually a ramp near the outlet. Launching and taking out on a tailwater is a timing problem as much as a facilities problem — know the generation schedule first.
Parking · Outlet parking fills early on weekends and holidays. Have a second access point in mind before you leave home.
Idaho publishes access points and boat ramps in the Fishing Planner map centre. Many reaches are reached from public road right-of-way or Forest Service land.
Gauge
A public gauge is mapped
Flow and water temperature for this water are read from USGS site 13190500, South Fork Boise River at Anderson Ranch Dam, ID. It is an official public gauge, not a fishing pin: it describes the river at one point, and the reach you stand in may be doing something else.
Species · derived
5 plausible here
Derived from water class (tailwater) and Rockies range — not a stocking record. Confirm species, seasons and any closures with Idaho Department of Fish and Game.
Brown trout
54–67°F published preference · handling becomes a conservation problem at 68°F
Rainbow trout
52–64°F published preference · handling becomes a conservation problem at 68°F
Cutthroat trout
48–62°F published preference · handling becomes a conservation problem at 66°F
Mountain whitefish
46–64°F published preference · handling becomes a conservation problem at 68°F
Steelhead
46–61°F published preference · handling becomes a conservation problem at 70°F