Updated August 2026

Lake Tools

Interactive tools for exploring water quality data across 13,297 lakes we track (9,479 graded) in 49 states and 2 Canadian provinces.

Look up any lake and see its water quality grade, clarity, phosphorus, chlorophyll-a, and trophic state.

Find the best lakes for fishing, swimming, or kayaking, filtered by activity and optional fish species.

Answer a few questions about water quality, fishing, and distance from home, and get five lakes that fit.

Pick your boat and rider weight to get a starting surf-side ballast, speed, and rope setup.

Find your wakesurf board length from rider weight, skill, and surf-vs-skim style.

Explore the lake data

Browse 13,297 lakes we track (9,479 graded)

Lakes ranked by best water-quality grade

Water-quality grades state by state

See every lake grade plotted on the map

US, Canada, and Europe with search and filters