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203-acre lake near North Dakota. North Dakota Game & Fish survey water. The lake tops out around 19 ft. The depth chart is built from real state fisheries GPS surveys, so the humps, channels and drop-offs you see are measured, not guessed. The season-by-season read for each species follows, from the map's own numbers.
The outline encloses 203 acres, worked by 2.6 miles of shoreline. The basin is a simple one (shoreline index 1.3) — close to a bowl, so the structure on the chart matters more than the bank. About 77% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. Tip to tip the water measures near 1.2 mi with a 0.4-mi widest point. Barnes County claims this one. Moon Lake sits 0 mi northwest — the closest neighbouring chart.
Spring puts walleye in skinny water — 4 to 15 ft is the zone. As the season builds they drop to 6 to 19 ft, wintering in 6 to 19 ft. Fall walleye concentrate at Break off the point, a prime-rated drop-off around 11 ft. Warm-month bites cluster around the evening and early morning. A crawler harness on bottom bouncer or a deep crankbait (trolled) covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 4 to 15 ft | dusk & dawn | Main-lake point (9 ft) | 1/8 oz jig + minnow, Hair jig |
| Summer | 6 to 19 ft | dusk & dawn | Break off the point (11 ft) | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 6 to 19 ft | dusk & night | Break off the point (11 ft) | Jigging rap, Jig + big minnow |
| Winter | 6 to 19 ft | dusk & dawn | Deep basin (19 ft) | Jigging spoon + minnow head, Rattle bait |
Start shallow in spring: yellow perch sit in 3 to 12 ft that time of year. Summer pushes them deeper, 6 to 19 ft, and winter fish settle into 6 to 19 ft. The spot to know is Back-bay flat, a weed flat in about 6 ft of water that rates prime for yellow perch in spring. Warm-month bites cluster around early morning. Throw a drop-shot micro plastics or a small spoon tipped with worm until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Back-bay flat (6 ft) | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 6 to 19 ft | dawn | Deep basin (19 ft) | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 6 to 19 ft | midday | Deep basin (19 ft) | Jigging spoon (small), Perch rig / spreader |
| Winter | 6 to 19 ft | midday & dawn | Deep basin (19 ft) | Tungsten jig + spikes, Rattle spoon (small) |
The chart marks 6 structure features on St. Mary's Lake; the deepest is Deep basin at about 19 ft.
Access data: North Dakota Game & Fish — Fishing Facilities. Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for North Dakota waters are set by the North Dakota Game and Fish — and special regulations can apply to St. Mary's Lake specifically, so confirm the current rules before you fish.
Check the official North Dakota fishing regulations →
St. Mary's Lake is about 19 ft (6 m) deep at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
Anglers target walleye, yellow perch on St. Mary's Lake.
Break off the point is the top-rated area: a drop-off in about 11 ft of water that rates prime for walleye in fall. The map above holds the full rated-spot list for every species and season.
For walleye, the summer bite is best in the evening and early morning. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on St. Mary's Lake is regulated by the North Dakota Game and Fish. Check the official North Dakota regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Moon Lake 0 mi · Kee Lake 6 mi · Eckelson Lake South 7 mi · Middle Eckelson 8 mi · Island Lake 12 mi · Fox Lake 12 mi · Sheyenne River 17 mi · Boom Lake 19 mi · James River 23 mi · Lake Ashtabula 24 mi · Alkali Lake 24 mi · Spiritwood Lake 26 mi
See how St. Mary's Lake stacks up: best walleye lakes in North Dakota · best yellow perch lakes in North Dakota
More water nearby: Barnes County fishing maps (10 charts). Browse all North Dakota fishing maps or see every water on DepthScout. Bathymetry credit: state fisheries survey programs. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.