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© 2026 Barbless.co. Flow and gauge data from USGS; weather from Open-Meteo. · v2026.10.18.2

  1. Home
  2. Fish
  3. Char
  4. Mackinaw Lake Trout

Updated September 26, 2026

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Mackinaw Lake Trout: fish species profile

Fish › Char

CharSalmonidaeG5 (Secure) · ESA: Not listed · Idaho: SNA

Mackinaw Lake Trout

Salvelinus namaycush

A deep-water char built for cold lakes, with the size and appetite to become a true trophy.

Overview

Size range

20–59 in

Size range

20–59 in

Size range

Typical adult length in the waters we cover.

Water temperature

Coldwater

Water temperature

Coldwater

Water temperature

Preferred thermal regime for this species.

Origin

Introduced

Origin

Introduced

Origin

Stocking and native history where this species is found.

About Mackinaw Lake Trout

Mackinaw, or lake trout, are an introduced char in Idaho and can grow very large in cold-water lakes. FishBase notes they occur in both shallow and deep water in northern lakes and streams, but are generally tied to relatively deep lakes farther south.

Also known as: lake trout, mackinaw, macks

Mackinaw Lake Trout Silhouette

  • Mackinaw Lake Trout species silhouette
    Primary

Behavior

spawning
Lake trout are non-anadromous and complete their life cycle in inland waters.
feeding style
Usually a solitary wanderer that ranges through cold water to hunt; larger fish are often strongly fish-eating, while juveniles feed more on invertebrates.
seasonal notes
Expect fish to use cold water year-round, often shifting between shallower and deeper zones within lakes as temperatures change.

Habitat

water types
deep cold lakes, large northern lakes, cold streams
preferred holds
Look for cold, deeper lake basins, drop-offs, and other areas that let fish move between shallow and deep water.

Where Found

  • Lake trout

    Clark Fork River

Angler Tactics

tactics
Focus on cold, deep lake water and cover depth until you contact fish. Because many adults key on other fish, presentations that imitate forage fish are often the best bet.
effective methods
trolling, deep jigging, large spoons, swimbaits or plugs, baitfish imitations

Regulations

Always check the current Idaho Fish and Game seasons and rules for the specific water before fishing, as lake-specific limits or exceptions may apply.

Regulations vary by water. Check current Idaho Fish and Game rules before fishing.

Conservation

Status: Introduced to Idaho

G5 (Secure) · ESA: Not listed · Idaho: SNA

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