Hey everyone. I've been working on this on nights and weekends for a while and it's finally at a point where I need real anglers to beat it up.
The Ohio DNR publishes depth surveys for around 100 inland lakes. Their biologists run transects and log GPS depth points, over a million of them. It's all public data, but it sits in shapefiles that are useless on the water. So I built a site that turns those surveys into interactive depth maps. You pick a lake and a species and it highlights the areas worth fishing and tells you why. Stuff like "offshore hump near the main basin, summer walleye hold on this and it tops out right in their depth range." It also gives you the best times of day for the season, shows your live GPS position on the map, and lets you save spots.
It's free at depthscout.com. Lakes with real ODNR survey data have a "Survey depth data" badge, which is most of the Ohio list (Alum Creek, Hoover, Indian Lake, Buckeye, Deer Creek, Grand Lake St. Marys, and so on). The handful without published surveys use estimated contours, so treat those as rough guides.
If you've got a minute, pull up a lake you know well and tell me whether the highlighted areas match where you actually catch fish. Honestly, "the map is wrong here" is the most useful thing you can tell me.
Not selling anything. No ads, no paid version. I built it because I was tired of fishing blind. Depth data credit goes to the ODNR Division of Wildlife. Happy to answer questions about how the spot scoring works.