Maximum Depth Is Not Where the Fish Are
A lake's maximum depth sets the scale, but it does not reveal where most of the water—or the fish—will be. Here is how to turn that one number into a practical map-reading plan.
Know where to fish.
Stop guessing where the fish are. Pick a lake or river, pick what you're after, and DepthScout shows you the spots worth fishing, when to be there, and what to throw. Turn on GPS and it puts you right on the mark.
Every chart is open. A free account only kicks in when you want to save spots or run live GPS on the water.
39163lakes & rivers
15977with real survey depth data
70species covered
Offlineworks with zero signal
Featured research
The Uneven Map Beneath the Water
We audited 37,672 public waters to see where measured bathymetry is easy to find—and where modeled contours still fill the gaps.
Read the report- Sitewide coverage
- 38.1%
- Regional catalogs
- 63
- Snapshot
- Aug. 13, 2026
From the Blog
Field notes for reading the water
Shallow Lake or Deep Lake? Read the Map Differently
A ten-foot break can dominate a shallow lake and disappear on a deep one. Learn how to reset your map-reading priorities when the basin changes.
How to Read a Lake Depth Map Before You Launch
A practical way to read lake depth-map or depth-chart contours, recognize structure, and choose three places worth checking before you launch.
Three taps to your next spot
1
Pick your water
39163 lakes and 489 rivers. Search by name, filter by region or species, or open the map and tap “find waters near me.”
2
Pick your fish
It looks at every point, hump, ledge and weedline, works out how your fish are using them this time of year, and tells you why each spot is worth a cast, when they'll be biting, and what to tie on.
3
Go catch them
Turn on GPS and the chart shows the depth under your boat and the bearing to the nearest prime spot. Save the water before you launch and everything works with zero signal.
Built for the water, not the couch
Real survey bathymetry
15977 waters are built on state fisheries GPS depth surveys. That's over a million real soundings, not guesswork, and every water is labeled so you know what you're looking at.
Spots with reasons
Nothing's hidden. Every spot tells you why it's good: “Offshore hump. Walleye hold here in summer, right in their 15-35 ft range.”
What to throw
Lure picks, live-bait choices and a technique tip for every species and season, from summer crawler harnesses to winter blade baits.
Bite windows
Dawn, dusk, midday, after dark. Rated feeding windows for each species and season, with a NOW badge when you're in one.
On-water GPS HUD
Your position on the depth chart, live depth under the boat, and the range and bearing to the nearest spot. Fishing guidance without a $2,000 graph.
Offline & installable
Save any water at the ramp and the full chart, spots and bait advice work with no signal. Add DepthScout to your home screen like a native app.
15,977 waters on real agency surveys
State fisheries GPS depth soundings, measured rather than modeled
Named government sources
State DNRs, USGS, NOAA and USACE. Every chart says which.
Honest labels on every chart
Survey data and approximated contours are never mixed up
Common questions
Is DepthScout free?
Yes. Browsing every lake, the depth charts, the highlighted spots and the bait advice is free with no account. A free account adds saved spots and the live GPS overlay. There are no ads; nothing on the page is sold to an advertiser. Some lure suggestions link to a shop and we may earn a commission if you buy, which is disclosed next to the links; the picks themselves are chosen by the analyzer and never paid for.
What does “Survey depth data” mean?
Waters with that badge are built from real GPS depth soundings collected by state fisheries biologists, so the contours reflect measured depths. Waters labeled “Approximated contours” use modeled depth from the water's real shoreline and maximum depth: a rough guide, clearly labeled.
Which states are covered?
Ontario (7929 waters), Sweden (6433 waters), Wisconsin (4318 waters), Minnesota (3774 waters), British Columbia (2459 waters), Québec (1868 waters), Finland (1551 waters), Michigan (1405 waters), Germany (1134 waters), United Kingdom (850 waters), Norway (664 waters), Maine (549 waters), New Hampshire (488 waters), Montana (366 waters), Saskatchewan (350 waters), Wyoming (320 waters), New York (310 waters), Massachusetts (262 waters), New Brunswick (261 waters), Washington (252 waters), Indiana (214 waters), North Dakota (212 waters), Iowa (192 waters), Texas (191 waters), Ohio (177 waters), Florida (174 waters), Alberta (171 waters), Connecticut (146 waters), Nebraska (141 waters), Netherlands (128 waters), Missouri (115 waters), Vermont (111 waters), California (102 waters), Oklahoma (96 waters), South Dakota (94 waters), Utah (93 waters), Arizona (88 waters), Colorado (86 waters), Alaska (83 waters), Illinois (83 waters), New Mexico (77 waters), Nova Scotia (74 waters), Kansas (73 waters), West Virginia (64 waters), Mississippi (62 waters), Idaho (62 waters), Estonia (59 waters), Kentucky (54 waters), New Jersey (54 waters), Oregon (50 waters), Alabama (50 waters), Tennessee (48 waters), Georgia (43 waters), Delaware (39 waters), Nevada (39 waters), Manitoba (39 waters), Virginia (38 waters), North Carolina (37 waters), Louisiana (35 waters), Rhode Island (29 waters), Pennsylvania (27 waters), South Carolina (27 waters), Arkansas (25 waters), Maryland (22 waters), Hawaii (17 waters), Puerto Rico (12 waters), plus border waters shared with neighboring states, and more on the way.
How does it pick the spots?
It scores every mapped piece of structure against the species' seasonal depth range and what kind of cover they relate to, then explains each spot in plain English. Nothing's hidden, every spot shows its reasoning.
Can I use it for navigation?
No. DepthScout is for fishing guidance only. Contours, even survey-based ones, are not navigation products. Always run safe and check local regulations.
Popular fishing guides
Ranked, survey-backed picks for where to fish by species and state.
best european perch lakes in Sweden · best northern pike lakes in Sweden · best brown trout lakes in Sweden · best yellow perch lakes in Ontario · best crappie lakes in Wisconsin · best bluegill lakes in Wisconsin · best yellow perch lakes in Wisconsin · best northern pike lakes in Ontario · best northern pike lakes in Minnesota · best yellow perch lakes in Minnesota · best bluegill lakes in Minnesota · best walleye lakes in Ontario · best rainbow trout lakes in British Columbia · best yellow perch lakes in Québec · best brook trout lakes in Québec · best northern pike lakes in Finland · best european perch lakes in Finland · best lake whitefish lakes in Finland · best walleye lakes in Québec · best yellow perch lakes in Michigan · best largemouth bass lakes in Michigan · best smallmouth bass lakes in Michigan · best european perch lakes in Germany · best northern pike lakes in United Kingdom · best european perch lakes in United Kingdom · best brown trout lakes in United Kingdom · best northern pike lakes in Germany · best lake whitefish lakes in British Columbia · best northern pike lakes in Norway · best european perch lakes in Norway
Most-searched depth maps
Geneva Lake depth map (WI) · Lake Winnebago depth map (WI) · St. Joseph River depth map (IN) · Toledo Bend Reservoir depth map (TX/LA) · Table Rock Lake depth map (MO/AR) · Hebgen Lake depth map (MT) · Nolin River Lake depth map (KY) · Lake Winnisquam depth map (NH) · Old Hickory Lake depth map (TN) · Mille Lacs Lake depth map (MN) · Lake Murray depth map (OK) · Gull Lake depth map (MI) · Wisconsin River (Dells) depth map (WI) · Lake Texoma depth map (TX/OK) · Forest Lake depth map (MN) · Lake Cumberland depth map (KY)
The maps stay free. Pro is for trip day.
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The fish are already somewhere. Now you are too.
Create your free accountDepth data: state fisheries surveys (incl. Ohio DNR Division of Wildlife) and modeled approximations, clearly labeled per water. Shorelines © OpenStreetMap contributors. For fishing guidance only, never navigation. Always check local regulations.
Fishing maps by state: Ontario · Sweden · Wisconsin · Minnesota · British Columbia · Québec · Finland · Michigan · Germany · United Kingdom · Norway · Maine · New Hampshire · Montana · Saskatchewan · Wyoming · New York · Massachusetts · New Brunswick · Washington · Indiana · North Dakota · Iowa · Texas · Ohio · Florida · Alberta · Connecticut · Nebraska · Netherlands · Missouri · Vermont · California · Oklahoma · South Dakota · Utah · Arizona · Colorado · Alaska · Illinois · New Mexico · Nova Scotia · Kansas · West Virginia · Mississippi · Idaho · Estonia · Kentucky · New Jersey · Oregon · Alabama · Tennessee · Georgia · Delaware · Nevada · Manitoba · Virginia · North Carolina · Louisiana · Rhode Island · Pennsylvania · South Carolina · Arkansas · Maryland · Hawaii · Puerto Rico
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