Species Listed for This Water
A species listing does not establish an open season or permission to keep a fish. Check the water-specific rules below before choosing a target species.
Highlights
Regulations
- Bass: Bass – no bag, length, or possession limits
- Brook Trout: Brook Trout limit is 25 Harvest allowed during any open season unless otherwise noted under Special Rules – if gear or bait restrictions are listed, they apply when fishing for Brook Trout
- Bull Trout: Bull Trout – catch-and-release
- Kokanee: Kokanee limit is 15
- Sturgeon: Sturgeon – catch-and-release Sturgeon must not be removed from the water and must be released upon landing Barbless hooks, sliding swivel device to secure a weight, and a lighter test line to secure weight to sliding swivel device are required, see page 56
- Tiger Muskie: Tiger Muskie limit is 2, none under 40 inches
- Trout includes Brown Trout, Golden Trout, Lake Trout, Arctic Grayling, Cutthroat Trout, Rainbow Trout, and trout hybrids: Trout limit is 6, all species combined
- Walleye: No bag, length, or possession limits, harvest is encouraged
- Whitefish: Whitefish limit is 25 – see Big Lost River exception Harvest allowed during any open season unless otherwise noted under Special Rules – if gear or bait restrictions are listed, they apply when fishing for whitefish
- Protected Nongame Fish including Bluehead Sucker: May not be harvested or possessed
- All Other Fish Species includes bullfrogs and crayfish: No bag, length or possession limits
No water-specific rule was found in our indexed IDFG data for Island Park Reservoir. The general Upper Snake Region limits above are a starting point only; confirm the exact water and section in the current IDFG rules before fishing.
Getting There
This pin identifies the water, not a verified parking area, boat launch, or legal entry point. Choose an established access site and check road conditions, fees, and land ownership before following directions.
Plan a trip to Island Park Reservoir
Choose a launch or bank access site before you travel. Changing reservoir levels can leave a ramp unusable or move the shoreline away from parking; confirm the site's current status and your return route.
The planning seasons shown above describe when to consider a trip. They are not an opening calendar. Read the rules for Island Park Reservoir, including section-specific restrictions, and check for current IDFG changes before fishing.
- Review Idaho fishing license and permit requirements for everyone in your group.
- Find an established fishing or boating access site with IDFG. A map pin does not grant access across private land.
- Compare other fishing waters in the Upper Snake Region for an alternative if your intended site is closed or unsuitable.
Historical records in this guide may not include the latest stocking. Open the source for current records and schedules.
Recent stocking history (649 events)
- 2025-09-30Rainbow Trout - Triploid · 5,363
- 2025-09-26Rainbow Trout - Triploid · 5,148
- 2025-06-18Rainbow Trout - Triploid · 10,605
- 2025-05-13Rainbow Trout - Triploid · 7,968
- 2024-10-02Rainbow Trout - Triploid · 13,270
- 2024-06-24Rainbow Trout - Triploid · 9,180
- 2024-06-18Rainbow Trout - Triploid · 3,600
- 2024-05-30Rainbow Trout - Triploid · 9,632
More in Upper Snake
Plan Your Trip
Review water details, access points, and live gauge conditions where a reporting station is available.
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