Ashton Reservoir

Boat Ramps: 0
Access Points: 1
Species: 8

Ashton Reservoir is a popular 371.6-acre impoundment of the Henrys Fork Snake River located in Fremont County, Idaho. Just north of the town of Ashton, this reservoir offers excellent fishing opportunities for a variety of trout species throughout the year. The reservoir is regularly stocked with rainbow trout and hosts several naturally reproducing fish populations. With its scenic mountain backdrop and relatively easy access, Ashton Reservoir is a favorite destination for both local anglers and visitors to eastern Idaho seeking productive fishing in a beautiful setting.

Idaho licenses and regulations4 to check before you go

Species & education

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

Find which waters have the species you want to catch

Smallmouth Bass

Micropterus dolomieu

Rainbow Trout

Oncorhynchus mykiss

Brown Trout

Salmo trutta

Cutthroat Trout

Oncorhynchus clarkii

Kokanee Salmon

Lake Trout

Salvelinus namaycush

Mountain Whitefish

Prosopium williamsoni

Yellow Perch

Perca flavescens

Fish stocking schedule

Latest 5 stockings

Rainbow Trout3,226 fish · 13.0 inApr 2, 2026
Rainbow Trout17,765 fish · 13.0 inApr 2, 2026
Rainbow Trout17,765 fish · 13.0 inApr 1, 2026
Rainbow Trout16,550 fish · 13.0 inApr 23, 2025
Rainbow Trout16,550 fish · 13.0 inApr 22, 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 Ashton 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.

Ashton Dam West access

Access Point

Know where you can legally fish on Ashton 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.

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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."

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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.

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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.

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Take Ashton 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 Ashton Reservoir to use it offline when coverage drops.
Log your catches here
Keep a private fishing journal for Ashton 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.