South Fork Boise River Fishing Guides
Idaho's best-known trout tailwater, a canyon river of big rainbows within easy reach of Boise.
Guides on the South Fork Boise River
Claimed profiles take booking requests. Unclaimed profiles are built from public records so the river is never empty; the guide can claim or remove one any time.
No guides listed yet
Guide or outfit this water? Create your profile. Listing is free, the commission is 10% or 7% with a premium profile, and premium profiles list first on this water.
About the South Fork Boise River
Anderson Ranch Dam releases cold water from depth into a basalt canyon, and the twelve or so miles below it are the most consistently productive trout water in southwest Idaho. The gauge at the dam reports both discharge and water temperature, which matters here more than on most rivers: the fishery is entirely a function of what the dam is doing, and anglers plan trips around the release schedule rather than around the weather.
Rainbow trout dominate, and the population is remarkable for a river this accessible – a high density of fish with a real share of them in the sixteen to twenty inch range. They are wild, they are well fed, and they are not easy. Brown trout are present in smaller numbers and tend to run larger. Mountain whitefish are abundant and are better sport than their reputation suggests. Bull trout occur and are protected; they must be released.
The canyon reach is famous for its insect hatches. A heavy salmonfly emergence typically comes off in May, followed by caddis and then the pale morning duns of summer. Late summer brings a well-known trico and terrestrial period, and autumn produces reliable blue-winged olive fishing on gray days. Access is by a road running down the canyon from the dam, with pullouts and trails throughout, and drift boats float the reach when flows permit.
Irrigation demand drives the release, so summer flows can be high and difficult while fall flows drop sharply. Anglers should check the current discharge before committing to a wading trip.
Guided trips run out of Boise, which is roughly a ninety-minute drive from the dam, making the South Fork an easy day trip from a city of a quarter million people. That proximity means the canyon sees steady pressure on summer weekends, and anglers looking for solitude do better midweek or well down the canyon.
This water needs a real photo
The photo at the top of this page is not South Fork Boise River.
It is a regional stand-in, honestly captioned but generic — we will not put a name to a river we cannot prove. Send us a photograph you took here and it replaces the stand-in, with your credit on it.
Add a photo of this water
Landscape, not fish — the water itself. Reviewed by hand before it appears. The first one published here earns the Pioneer badge.
Fished this water? Add a photo
Reviewed by hand before it appears. Pick the water, not the spot — we never publish exact locations.
Access
Anderson Ranch Dam - the top of the tailwater and the gauge site.
Canyon road pullouts - continuous roadside access down the canyon below the dam.
Cow Creek Bridge - a well-used access point and float launch.
Danskin Bridge - the lower canyon access and a common takeout.
Neal Bridge - lower river access above Arrowrock Reservoir.
Fall Creek - a side-canyon access with parking and trail.
Pine - the small community above the reservoir with services and river access.
Seasons
Spring: the salmonfly hatch in May is the headline event and draws real crowds.
Summer: high irrigation releases; caddis and pale morning duns, with wading conditions dictated by flow.
Fall: flows drop, the fishing gets technical and excellent, and the crowds thin out.
Winter: cold and lightly fished, but the tailwater stays open and midge fishing can be good.
From the water
No logged trips yet. Be the first to put this water on your map.
Log this water
Fished it or cleaned it? Log in or create a free account to log a trip with photos and earn the waterway badge.
Questions
What is the current flow on the South Fork Boise River?
As of Sep 17, 5:15 am, the USGS gauge SF BOISE RIVER AT ANDERSON RANCH DAM ID reads 300 cfs, with water temperature 50.7 F. Conditions update every 15 minutes.
What species can you catch on the South Fork Boise River?
Anglers target Brown Trout, Bull Trout, Mountain Whitefish, Rainbow Trout on the South Fork Boise River in Idaho.
Where can you access the South Fork Boise River?
Anderson Ranch Dam - the top of the tailwater and the gauge site. Canyon road pullouts - continuous roadside access down the canyon below the dam. Cow Creek Bridge - a well-used access point and float launch. Danskin Bridge - the lower canyon access and a common takeout. Neal Bridge - lower river access above Arrowrock Reservoir. Fall Creek - a side-canyon access with parking and trail. Pine - the small community above the reservoir with services and river access.
When is the best time to fish the South Fork Boise River?
Spring: the salmonfly hatch in May is the headline event and draws real crowds. Summer: high irrigation releases; caddis and pale morning duns, with wading conditions dictated by flow. Fall: flows drop, the fishing gets technical and excellent, and the crowds thin out. Winter: cold and lightly fished, but the tailwater stays open and midge fishing can be good.
Where are the fishing regulations for the South Fork Boise River?
Regulations change by season and section. Read the current rules on the Idaho agency site: https://idfg.idaho.gov/rules/fish