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Rating depth structure for walleye.
Recent public catches load as you reach this section.
478-acre lake near North Dakota. North Dakota Game & Fish survey water. The lake tops out around 17 ft. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled. What follows comes from the same scoring engine that paints the spots above.
Traced from the shoreline, Ost Lake runs 478 acres with 3.4 miles of edge. The basin is a simple one (shoreline index 1.1) — close to a bowl, so the structure on the chart matters more than the bank. The shallow band under 15 ft claims about 80% of the surface — that's where the groceries are. Figure 1.3 mi of water from one end to the other, 0.8 mi at the beam. The water lies in Logan County. For a second option, Railroad Lake lies 1 mi south.
Spring walleye on Ost Lake hold shallow, usually 4 to 15 ft. They move out to 5 to 17 ft in summer and finish the year down in 5 to 17 ft. Put Deep basin first on the milk run — a deep basin near 17 ft that grades prime for winter. The feeding windows run the evening and early morning. The summer box starts with a crawler harness on bottom bouncer or a deep crankbait (trolled).
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 4 to 15 ft | dusk & dawn | Main-lake point (1 ft) | 1/8 oz jig + minnow, Hair jig |
| Summer | 5 to 17 ft chart-limited; documented 15 to 35 ft | dusk & dawn | Deep basin (17 ft) | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 5 to 17 ft chart-limited; documented 12 to 40 ft | dusk & night | Deep basin (17 ft) | Jigging rap, Jig + big minnow |
| Winter | 5 to 17 ft chart-limited; documented 20 to 40 ft | dusk & dawn | Deep basin (17 ft) | Jigging spoon + minnow head, Rattle bait |
Early season yellow perch use the shallows, holding in 3 to 12 ft. Expect a summer slide to 5 to 17 ft, then a winter hold in 5 to 17 ft. Put Deep basin first on the milk run — a deep basin near 17 ft that grades prime for fall. In summer the feeding windows fall in early morning. Tie on a drop-shot micro plastics or a small spoon tipped with worm and you're in the game.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Shallow bay flat (1 ft) | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 5 to 17 ft chart-limited; documented 10 to 30 ft | dawn | Deep basin (17 ft) | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 5 to 17 ft chart-limited; documented 12 to 35 ft | midday | Deep basin (17 ft) | Jigging spoon (small), Perch rig / spreader |
| Winter | 5 to 17 ft chart-limited; documented 15 to 35 ft | midday & dawn | Deep basin (17 ft) | Tungsten jig + spikes, Rattle spoon (small) |
6 pieces of structure are mapped here — Deep basin, around 17 ft, is the deepest of them.
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 Ost Lake specifically, so confirm the current rules before you fish.
Check the official North Dakota fishing regulations →
Ost Lake is about 17 ft (5 m) deep at its deepest point. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled.
Anglers target walleye, yellow perch on Ost Lake.
Deep basin is the top-rated area: a deep basin in about 17 ft of water that rates prime for walleye in winter. The interactive chart above rates every spot for each 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 Ost 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.
Railroad Lake 1 mi · Mundt Lake 2 mi · Lehr WMA 4 mi · Nagel Lake 5 mi · Miller Lake 5 mi · Harr Lake 9 mi · Green Lake 13 mi · Flood Lake South 13 mi · Diamond Lake 14 mi · Marvin Miller Lake 16 mi · Dorfman Lake 16 mi · Kalmbach Lake 18 mi
See how Ost Lake stacks up: best walleye lakes in North Dakota · best yellow perch lakes in North Dakota
More water nearby: Logan County fishing maps (9 charts). Browse all North Dakota fishing maps. See every water on DepthScout. Bathymetry: published agency survey data. 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.