Island Park Reservoir

Boat Ramps: 3
Access Points: 3
Species: 9

Island Park Reservoir is a stunning 7,300-acre lake located in eastern Idaho, nestled within the breathtaking Caribou-Targhee National Forest. Situated at an elevation of 6,300 feet above sea level, this scenic reservoir offers anglers 64 miles of shoreline to explore and exceptional fishing opportunities throughout the year. Known for its clear waters and beautiful mountain backdrop, Island Park Reservoir has established itself as a premier fishing destination, particularly for trout and salmon enthusiasts. The reservoir serves as the source of the Henry's Fork at Box Canyon and lies north and west of Harriman State Park, making it part of a region renowned for its world-class fishing waters.

Idaho licenses and regulations4 to check before you go

Species & education

Learn what type of fish are at Island Park Reservoir and what's needed to catch them.

Find which waters have the species you want to catch

Rainbow Trout

Oncorhynchus mykiss

Brook Trout

Salvelinus fontinalis

Cutthroat Trout

Oncorhynchus clarkii

Bluegill Sunfish

Lepomis macrochirus

Coho Salmon

Oncorhynchus kisutch

Mountain Whitefish

Prosopium williamsoni

Splake

Steelhead

Yellow Perch

Perca flavescens

Fish stocking schedule

Latest 5 stockings

Rainbow Trout10,514 fish · 13.0 inOct 22, 2026
Rainbow Trout18,720 fish · 13.0 inMay 20, 2026
Rainbow Trout483 fish · 13.0 inSep 30, 2025
Rainbow Trout2,208 fish · 13.0 inSep 30, 2025
Rainbow Trout2,672 fish · 13.0 inSep 30, 2025

Source

Idaho Department of Fish and Game

Updated Nov 13, 2026. Sizes are the length the agency reports. Dates are as precise as the agency reports them.

Open stocking page

Fishing spots, boat ramps & amenities

Learn how to get on Island Park Reservoir. Uncover great fishing access points, boat ramps, and all the facilities you need for an unforgettable day on the water. Some locations shown may border or include private property. Always check property boundaries and applicable regulations before visiting. onWater's Public & Private Land layer can help you plan your access with confidence.

Know where you can legally fish on Island Park Reservoir

See public and private land boundaries along the water, turn on private parcels with owner details to know where permission is required, and find land-trust parcels that offer permitted fishing access.

Idaho licenses and regulations

Idaho Boating Regulations

When using any type of watercraft to access a body of water, it is important to follow all federal, state, and local rules and regulations. These rules and regulations include boat permitting and licensing, invasive species inspections and stamps, life jacket and PFD rules, motor size and horsepower restrictions, noise limitations, restrictions on personal watercraft, and many more. Visit the web link below for the most current rules and regulations for this body of water.

Learn more

Idaho Fishing License

"To fish in Idaho any person 14 years of age or older must have a valid fishing license. Anglers younger than 14 do not need a license, but there is a small difference between resident and nonresident youth. -A resident child under 14 has their own separate fishing limit. -A nonresident child under 14 must be with someone who has a valid fishing license and their fish are in included in the license holders fishing limit. However, a nonresident child may purchase their own license and have their own limit. Special fishing permits are need for some activities for both residents and nonresidents: -Fishing for salmon and steelhead -Fishing with two poles."

Learn more

Idaho Fishing Regulations

This river has a variety of species and regulations, including potential floating and/or watercraft restrictions. Because this river is specially managed for species, seasons, angling methods, and watercraft, it is strongly encouraged you check all federal, state, and local regulations before fishing. Visit any of the links below, inquire locally, or contact a local fly shop to learn current regulations and restrictions.

Learn more

Idaho Stream Access Laws

Navigable streams are recognized as public transportation corridors, thus members of the public have the right to use the corridor, provided they enter and exit the corridor at a public right of way and remain within the corridor. Many navigable streams flow through private property, thus it is important that anglers know their rights and responsibilities when fishing in navigable waters that flow through private property.

Learn more

Take Island Park Reservoir with you

The onWater Fish app keeps this water's access points, species and conditions in your pocket, with the tools you use once you're there.

Use the map without signal
Download the map around Island Park Reservoir to use it offline when coverage drops.
Log your catches here
Keep a private fishing journal for Island Park Reservoir to find where and when fish are biting for you.
HD depth charts from Garmin
Find drop offs, ledges, channels, points and shallow flats with Garmin depth charts in the app.