Chesterfield Reservoir

Boat Ramps: 1
Access Points: 1
Species: 3

Chesterfield Reservoir, also known as Portneuf Reservoir, is a 1,245.9-acre body of water located in Caribou County, Idaho. This popular fishing destination has been attracting anglers for decades due to its superb rainbow trout fishery. The reservoir is fed by the Portneuf River and is known for producing trophy-sized rainbow trout. Located in southeast Idaho, Chesterfield Reservoir offers both open water fishing during warmer months and a popular ice fishery during winter. The ice typically forms early and remains throughout the winter season, which can be quite long in this part of the state. The reservoir's high-quality rainbow trout fishery is maintained through regular stockings by Idaho Fish and Game.

Idaho licenses and regulations4 to check before you go

Species & education

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

Find which waters have the species you want to catch

Rainbow Trout

Oncorhynchus mykiss

Brown Trout

Salmo trutta

Cutthroat Trout

Oncorhynchus clarkii

Fish stocking schedule

Latest 5 stockings

Rainbow Trout334 fish · 13.0 inOct 31, 2026
Rainbow Trout3,179 fish · 13.0 inOct 20, 2026
Rainbow Trout11,297 fish · 13.0 inOct 19, 2026
Rainbow Trout4,727 fish · 13.0 inOct 19, 2026
Rainbow Trout92 fish · AdultsMay 13, 2026

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 Chesterfield 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.

Chesterfield Reservoir Boat Ramp

Boat Ramp

Know where you can legally fish on Chesterfield 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 Chesterfield 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 Chesterfield Reservoir to use it offline when coverage drops.
Log your catches here
Keep a private fishing journal for Chesterfield 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.