Fremont County, ID · Inland River
Henry’s Fork (Island Park)
A fly-fishing mecca on Idaho’s upper Snake plateau, famous for the slow, glassy spring-creek water through Last Chance and the Harriman “Ranch.” Big, selective wild rainbow and brown trout sip technical mayfly hatches — the green drake and PMD emergences are legendary. The Box Canyon above it offers faster pocket water.
Live · updated
Top picks today
Rainbow Trout, Brown Trout & Brook Trout — tied at the top (74/100)
3 species tied for best of 3 tracked at Henry’s Fork (Island Park).
Atmosphere
Water
Sun & Moon
Species at Henry’s Fork (Island Park)
3 species tracked, ranked by today's conditions. The top 3 (tied) are open below — tap any species to expand it, or a chip to focus.
#1 Rainbow Trout Great day to fish for Rainbow Trout. In season 74/100
What's helping
- 12 mph wind — light chop — baitfish active, fish willing to feed
- Stable flow — settled river level — clearer water, easier wading
About. Oncorhynchus mykiss — The most heavily stocked trout in Maryland. Put-and-take fisheries across the state plus holdover/wild fish in Western MD streams (Savage, Youghiogheny tailwater, Gunpowder). Takes PowerBait, small spinners, and standard dry/nymph patterns.
Prefers. Water 45–68°F (ideal 55°F) · either tide · depth 3–20 ft.
- Daily creel
- 6
Idaho general trout limit: 6/day.
Source: Idaho non-tidal regulations · verified 2026-06-03.
#1 Brown Trout Great day to fish for Brown Trout. In season 74/100
What's helping
- 12 mph wind — light chop — baitfish active, fish willing to feed
- Stable flow — settled river level — clearer water, easier wading
About. Salmo trutta — Naturally reproduces in the Gunpowder River tailwater (Loch Raven below Prettyboy) and several Western MD streams; also heavily stocked. Typically more wary than rainbows. Classic mayfly hatches on the Gunpowder — sulphurs, BWOs, caddis. Streamer-eaters after dark.
Prefers. Water 45–68°F (ideal 55°F) · either tide · depth 3–25 ft.
- Daily creel
- 6
Idaho general trout limit: 6/day.
Source: Idaho non-tidal regulations · verified 2026-06-03.
#1 Brook Trout Great day to fish for Brook Trout. In season 74/100
What's helping
- 12 mph wind — light chop — baitfish active, fish willing to feed
- Stable flow — settled river level — clearer water, easier wading
About. Salvelinus fontinalis — Maryland's only native trout and a conservation priority species. Surviving wild populations are in small, cold headwater streams in Garrett, Allegany, and a few pockets of central/western MD. Small, aggressive, and spectacularly colored — sensitive to warming and habitat loss.
Prefers. Water 40–65°F (ideal 52°F) · either tide · depth 1–10 ft.
- Daily creel
- 6
Idaho general trout limit: 6/day (brook trout are often liberalized in high lakes — confirm the water).
Source: Idaho non-tidal regulations · verified 2026-06-03.
Location Info
Water Body
Inland River
Access
Pier, shore, and ramp
Jurisdiction
Idaho non-tidal
Coordinates
Notes
The Harriman State Park “Ranch” section is fly-fishing-only, catch-and-release. Confirm the reach you’re fishing.
Local reports & rules for Henry’s Fork (Island Park): Idaho Fish & Game fishing & regulations → · trout stocking schedule → · fish-consumption advisories (EPA directory) →
Nearby Access Points
Frequently Asked
Do I need a fishing license to fish at Henry’s Fork (Island Park)?
Yes (anglers age 16 and older). To fish at Henry’s Fork (Island Park) you need the appropriate state fishing license. See the agency's current rules: the state agency website
What fish are commonly targeted at Henry’s Fork (Island Park)?
Henry’s Fork (Island Park) is listed on this site for 3 commonly-targeted species: Rainbow Trout, Brown Trout, Brook Trout. Which species is currently in season and which is scoring highest today is shown in the per-species ranking on this page.
When is the best time to fish at Henry’s Fork (Island Park)?
It depends more on the species and the day's conditions than on a fixed "best hour." Water temperature, weather, and — at tidal locations — the stage of the tide drive activity most. The per-species ranking on this page scores every target species at Henry’s Fork (Island Park) against today's live conditions, so the fish near the top are your best bets right now; check back as conditions change through the day.
What kind of access does Henry’s Fork (Island Park) have?
Henry’s Fork (Island Park) has multiple access types — pier, shoreline, and at least one public boat ramp. The Harriman State Park “Ranch” section is fly-fishing-only, catch-and-release. Confirm the reach you’re fishing.
Which state's fishing regulations apply at Henry’s Fork (Island Park)?
state agency regulations apply at Henry’s Fork (Island Park). Size limits, creel limits, and seasonal closures are listed per species on each species page. Always confirm against the agency source linked from each regulation block — emergency closures can take effect mid-season.
Is Henry’s Fork (Island Park) tidal water?
No. Henry’s Fork (Island Park) is non-tidal — water level varies with rainfall, seasonal flow, and (where applicable) upstream dam releases rather than tidal exchange.