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Rating depth structure for brook trout.
Shared by DepthScout anglers. Exact spots stay private, always.
53-acre lake near Saint Francis. The lake tops out around 8 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:
Third Wallagrass Lake maps at 53 acres behind 1.8 miles of shoreline, with a single island in the mix. With a 1.8 development index there's bank structure worth casting at, in moderation. There is no deep basin to speak of — the entire surface is under ~15 ft, prime weed water end to end. The basin spans about 0.6 mi end to end and 0.3 mi across at its widest. It sits in Aroostook County. If the bite dies, McLean Lake is 2 mi to the west.
Early season brook trout use the shallows, holding in 1 to 8 ft. Even in summer they hold at 2 to 8 ft; winter keeps them in 1 to 8 ft. Put Deep basin first on the milk run — a deep basin near 8 ft that grades prime for summer. In summer the feeding windows fall in early morning and the evening. Tie on a small spoon fished deep or a trolled lake-clear wobbler + worm and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 8 ft | dawn & dusk | Main-lake point (2 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 2 to 8 ft | dawn & dusk | Deep basin (8 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 1 to 8 ft | midday & dawn | Main-lake point (2 ft) | Small spoon (orange), Spinner |
| Winter | 1 to 8 ft | dawn | Deep basin (8 ft) | Small jigging spoon, Tungsten jig + plastic |
Third Wallagrass Lake carries 5 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 8 ft down.
Season dates, license requirements, and size and bag limits for Maine waters are set by the Maine IFW — and special regulations can apply to Third Wallagrass Lake specifically, so confirm the current rules before you fish.
Check the official Maine fishing regulations →
Third Wallagrass Lake is about 8 ft (2 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 brook trout on Third Wallagrass Lake.
Deep basin is the top-rated area: a deep basin in about 8 ft of water that rates prime for brook trout in summer. Scroll up to the map for the complete spot list by species and season.
For brook 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.
Fishing on Third Wallagrass Lake is regulated by the Maine IFW. Check the official Maine regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
McLean Lake 2 mi · Gilbert Pond 3 mi · Bran Lake 3 mi · Little Gilbert Pond 3 mi · Hunnewell Lake 4 mi · Second Wallagrass Lake 5 mi · 2nd Pelletier Brook Lk 5 mi · 3rd Pelletier Brook Lk 6 mi · 4th Pelletier Brook Lk 7 mi · Wheelock Lake 8 mi · Isie Lake 8 mi · 5th Pelletier Brook Lk 9 mi
See how Third Wallagrass Lake stacks up: best brook trout lakes in Maine
More water nearby: Aroostook County fishing maps (85 charts). Browse all Maine fishing maps or 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.