Lahontan Cutthroat Trout

Habitat Distribution

• Native range is locked inside the Lahontan hydrographic basin — northern Nevada, the Eastern Sierra foothills of California, and a sliver of southeastern Oregon — making this the only native cutthroat of the western Great Basin.
• Self-sustaining wild populations cling to about 10.5% of historic stream habitat, mostly small isolated headwater fragments; stocked fisheries extend the species into alkaline stillwaters and a few states outside the native range.
• No other salmonid handles what these fish handle: alkaline water with TDS up to 12,000 mg/L, pH approaching 9.5, and stream temperatures pushing into the low 70s°F.
• Habitat ranges from massive terminal desert lakes to alpine lakes, Sierra freestone streams, and slow desert creeks — a wider spread of conditions than any other cutthroat occupies.

Specific Spots

• In big alkaline lakes, the sharpest drop-offs off sandy beaches do the work — places where ankle-deep water falls off into 15+ feet within a step concentrate cruising fish hunting the ledge.
• Through warmer months lake fish ride just above or below the thermocline; in spring and fall they push back into the shallows and stack near tributary mouths ahead of the spawn.
• Stream fish hold in pools with real cover — undercut banks, wood, boulders — and shift to the deepest, slowest pools available through fall and winter, with home ranges sometimes as small as 300 feet.
• Riparian shade and clean gravel matter: shaded reaches with intact streambanks and gravel substrate hold the bulk of headwater fish and serve as their spawning water.