Idaho /

Spring Valley Reservoir

Reservoir in Idaho · 53 acres · near Troy

Spring Valley Reservoir has 1 boat ramp listed as public.

Algal bloom health watch

Idaho Department of Health and Welfare has a cyanobacteria health watch for this water (updated October 2, 2026). Avoid contact with discoloured water or scum, and keep pets and children out of it.

Idaho Department of Health and Welfare · checked October 18, 2026

Past algal blooms

Harmful algal blooms reported on this water (state reports compiled by U.S. EPA): 2020, 2021 and 2026.

state reports compiled by U.S. EPA · checked October 18, 2026

Launches