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289-acre lake near Pend Oreille County. The lake tops out around 90 ft. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled. What the data behind the map says about each species, season by season:
Traced from the shoreline, Marshall Lake runs 289 acres with 2.6 miles of edge. Its 1.1 shoreline index means few bank features; the contours below do the pattern work. The shallow band under 15 ft claims about 6% of the surface — that's where the groceries are. Tip to tip the water measures near 1 mi with a 0.7-mi widest point. You'll find it in Pend Oreille County. The nearest mapped water is South Skookum Lake, 10 mi to the northwest.
Early season cutthroat trout use the shallows, holding in 3 to 15 ft. Expect a summer slide to 10 to 35 ft, then a winter hold in 10 to 40 ft. In summer the feeding windows fall in early morning and the evening. Tie on a trolled spoon (small) or an inline spinner and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 15 ft | dawn & dusk | open water | Inline spinner (silver/gold), Small spoon |
| Summer | 10 to 35 ft | dawn & dusk | open water | Trolled spoon (small), Inline spinner |
| Fall | 5 to 25 ft | dawn & dusk | open water | Casting spoon, Inline spinner |
| Winter | 10 to 40 ft | dawn | open water | Small jigging spoon, Marabou jig |
In spring, largemouth bass run shallow here, mostly 2 to 10 ft. Midsummer fish sit out in 8 to 20 ft before dropping to 15 to 35 ft for winter. Spring largemouth bass concentrate at Shallow feeding flat, a prime-rated feeding flat around 9 ft. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a texas-rigged 10" worm or a deep-diving crankbait most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Shallow feeding flat (9 ft) | Spinnerbait, Chatterbait |
| Summer | 8 to 20 ft | dawn & dusk | Shallow bay flat (20 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Shallow feeding flat (9 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 15 to 35 ft | midday | open water | Blade bait, Jigging spoon |
The chart marks 4 structure features on Marshall Lake; the deepest is Deep basin at about 90 ft.
Access data: Washington WDFW — Water Access Sites. Confirm conditions and fees locally before you launch.
| Date | Species | Count | Size |
|---|---|---|---|
| May 19 | Cutthroat trout | 32,340 | — |
| Oct 21, 2025 | Cutthroat trout | 23,430 | — |
Source: WDFW fish-stocking reports, retrieved 2026-09-23.
Season dates, license requirements, and size and bag limits for Washington waters are set by the Washington Department of Fish and Wildlife — and special regulations can apply to Marshall Lake specifically, so confirm the current rules before you fish.
Check the official Washington fishing regulations →
Marshall Lake is about 90 ft (27 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 cutthroat trout, largemouth bass on Marshall Lake.
Shallow feeding flat is the top-rated area: a feeding flat in about 9 ft of water that rates prime for largemouth bass in spring. Scroll up to the map for the complete spot list by species and season.
For cutthroat trout, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Yes — per WDFW fish-stocking reports records, Marshall Lake was most recently stocked May 19 with 32,340 cutthroat trout. The full stocking history is listed above.
Fishing on Marshall Lake is regulated by the Washington Department of Fish and Wildlife. Check the official Washington regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
South Skookum Lake 10 mi · Davis Lake 10 mi · Diamond Lake 11 mi · North Skookum Lake 11 mi · Blue Lake 11 mi, ID · Sacheen Lake 14 mi · Fan Lake 21 mi · Round Lake 21 mi, ID · Eloika Lake 22 mi · Kelso Lake 24 mi, ID · Priest Lake 26 mi, ID · Shepherd Lake 26 mi, ID
See how Marshall Lake stacks up: best largemouth bass lakes in Washington · best cutthroat trout lakes in Washington
More water nearby: Pend Oreille County fishing maps (11 charts). Browse all Washington 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.