south-fork-boise
South Fork Boise River is a river in Idaho. It is a fork of Boise River.
It ranks #5 among the 28 waters of Idaho in the registry, and is of regional prominence.
Also called South Fork Boise, South Fork Boise Tailwater, South Fork of the Boise River, Boise River, South Fork and Governor's River.
Fished for trout (inferred from the species listed).
Species: rainbow trout, bull trout and brook trout.
USGS GNIS record: 390888.
Stretches: Anderson Ranch Dam to Danskin Bridge and Danskin Bridge to Neal Bridge.
Access points: Danskin Bridge and Neal Bridge.
Features: Anderson Ranch Dam and Arrowrock Reservoir.
Devil's Hole (feature). Class II-III rapid named in the lower half of the roadless float (Fly Fisherman). Single source. Also called Devils Hole.
It is on the stretch Danskin Bridge to Neal Bridge.
It is upstream of Neal Bridge.
It is downstream of Raspberry.
Raspberry (feature). Class II-III rapid named in the lower half of the roadless float (Fly Fisherman). Single source; a rapid, not a documented fishing hole.
It is on the stretch Danskin Bridge to Neal Bridge.
It is upstream of Devil's Hole.
Float: Danskin Bridge to Neal Bridge (roadless float), from Danskin Bridge to Neal Bridge, 16 miles.
Float: Anderson Ranch Dam to Danskin Bridge, from Anderson Ranch Dam to Danskin Bridge, 10 miles.
Float: Anderson Ranch Dam to Neal Bridge, from Anderson Ranch Dam to Neal Bridge, 26 miles.
Sourced from 6 independent fly sites.
Sources: cdn.orvis.com (retrieved 2026-10-20), fishingreports.orvis.com (retrieved 2026-10-20), flyfisherman.com (retrieved 2026-10-29), guiderecommended.com (retrieved 2026-10-20), idahoangler.com (retrieved 2026-10-29), idahoangler.com (2) (retrieved 2026-10-29), idahoangler.com (3) (retrieved 2026-10-29), idahoangler.com (4) (retrieved 2026-10-29), idahoangler.com (5) (retrieved 2026-10-29), Idaho Department of Fish and Game, nwschoolofflyfishing.com (retrieved 2026-10-20) and The Perfect Fly Store.
Hatches
Cicada
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul hatching
- Aug
- Sep
- Oct
- Nov
- Dec
July cicada patterns (Royal Stimulator, size 6-8) per Fly Fisherman; Idaho Angler's July 2026 report lists a cicada fly.
Sources: idahoangler.com, flyfisherman.com
Caddis
- Jan
- Feb
- Mar
- Apr
- May hatching
- Jun hatching
- Jul hatching
- Aug hatching
- Sep
- Oct hatching
- Nov
- Dec
Caddis show up in Idaho Angler's May 2026 report, run all day in June into July per Fly Fisherman (size 14-16), appear as evening hatches in the late-August 2025 shop report, and are seen on October evenings by a Boise-area instructor.
Sources: idahoangler.com, idahoangler.com, nwschoolofflyfishing.com, flyfisherman.com
Pink Albert (Epeorus albertae) (Epeorus albertae)
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul hatching
- Aug hatching
- Sep
- Oct
- Nov
- Dec
Afternoon emergers and duns in July-August (size 16) per Fly Fisherman, who names the species; Orvis' report lists 'pinks' and the Idaho Angler August 2025 note mentions pink cahills.
Sources: idahoangler.com, flyfisherman.com, fishingreports.orvis.com
Blue-winged olive / Baetis
- Jan
- Feb hatching
- Mar hatching
- Apr
- May hatching
- Jun
- Jul
- Aug
- Sep hatching
- Oct hatching
- Nov hatching
- Dec
Fall afternoon hatches strongest late Sep-Nov and heavy again in Feb-Mar on rainy or sleety days (Fly Fisherman); Idaho Angler reports olives in Feb 2026, May 2026 and Oct 2025 (size 18-20). The fall olive begins after about 3 pm.
Sources: idahoangler.com, idahoangler.com, nwschoolofflyfishing.com, flyfisherman.com, idahoangler.com
Pale morning dun
- Jan
- Feb
- Mar
- Apr
- May hatching
- Jun
- Jul hatching
- Aug hatching
- Sep
- Oct hatching
- Nov
- Dec
Fly Fisherman has PMDs once stoneflies and caddis fade (Jul-Aug); Idaho Angler saw mixed PMDs in May 2026 and lingering ones in October 2025.
Sources: idahoangler.com, flyfisherman.com, idahoangler.com
Salmonfly
- Jan
- Feb
- Mar
- Apr
- May
- Jun hatching
- Jul hatching
- Aug
- Sep
- Oct
- Nov
- Dec
Fly Fisherman puts salmonflies and golden stones in June and early July; Idaho Angler's May 2026 report says salmonflies are still to come and its July 8 2026 report says the last ones are around. Fish may refuse big flies after dense hatches.
Sources: idahoangler.com, idahoangler.com, flyfisherman.com
Terrestrials (hoppers, ants)
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul hatching
- Aug hatching
- Sep
- Oct
- Nov
- Dec
Big attractors and ants in July 2026; hoppers in the late-August 2025 report.
Sources: idahoangler.com, idahoangler.com
Midges
- Jan hatching
- Feb hatching
- Mar hatching
- Apr hatching
- May hatching
- Jun hatching
- Jul hatching
- Aug hatching
- Sep hatching
- Oct hatching
- Nov hatching
- Dec hatching
Fly Fisherman lists midges year-round (size 20 under an indicator in slow water); Idaho Angler's Feb 2026 report confirms winter midging.
Sources: idahoangler.com, flyfisherman.com
Golden stonefly
- Jan
- Feb
- Mar
- Apr
- May hatching
- Jun hatching
- Jul hatching
- Aug
- Sep
- Oct
- Nov
- Dec
Fly Fisherman groups goldens with salmonflies in the late-May to early-July stonefly window.
Sources: flyfisherman.com
Skwala
- Jan
- Feb hatching
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
The Feb 25 2026 Idaho Angler report says skwalas are just starting to appear (size 12-14). The river is closed from 1 April to the Friday before Memorial Day weekend, so the spring stonefly window is mostly off-limits.
Sources: idahoangler.com, idahoangler.com
Made for South Fork Boise River
- South Fork Boise Harvest Ale, a beer by @southfork_nymph
- Tailwater Caddis BWO Trucker Hat, a hat by @southfork_nymph
- October BWO Last Chance Cripple, a fly by @southfork_nymph
- Blowtorch South Fork Session Lager, a beer by @hackle_boisesouth
- Boise Canyon Stonefly Trucker Hat, a hat by @hackle_boisesouth
- October Pink Albert Hackle Stacker, a fly by @hackle_boisesouth
- Streambed Jade Mayfly Dry Fly, a fly by @dekasso
Access, closures and rules change; check with the state agency before you go.