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Rating depth structure for brook trout.
Shared by DepthScout anglers. Exact spots stay private, always.
62-acre lake near T7 R11 WELS. 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. Below is the species-by-species picture, pulled from the same data the map uses.
On the chart, Fourth Lake draws 62 acres inside 3.5 miles of shoreline — one island included. That shoreline is heavily fingered (development index 3.2) — bays, points and pockets everywhere, which multiplies the fishable edge. The whole water is littoral — nothing here runs deeper than ~15 ft, so it's all weed-and-bait territory. Tip to tip the water measures near 1.5 mi with a 0.3-mi widest point. The water lies in Piscataquis County. For a second option, East Branch Pond lies 1 mi south.
In spring, brook trout run shallow here, mostly 2 to 15 ft. Midsummer fish sit out in 5 to 17 ft before dropping to 3 to 17 ft for winter. Summer brook trout concentrate at Deep basin, a prime-rated deep basin around 15 ft. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a small spoon fished deep or a trolled lake-clear wobbler + worm most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Main-lake point (2 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 5 to 17 ft | dawn & dusk | Deep basin (15 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (2 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 17 ft | dawn | Deep basin (15 ft) | Small jigging spoon, Tungsten jig + plastic |
5 pieces of structure are mapped here — Deep basin, around 15 ft, is the deepest of them.
Season dates, license requirements, and size and bag limits for Maine waters are set by the Maine IFW — and special regulations can apply to Fourth Lake specifically, so confirm the current rules before you fish.
Check the official Maine fishing regulations →
Fourth 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 brook trout on Fourth Lake.
Deep basin is the top-rated area: a deep basin in about 15 ft of water that rates prime for brook trout in summer. The map above holds the full rated-spot list for every 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 Fourth 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.
East Branch Pond 1 mi · Snake Pond 2 mi · Little Carpenter Pond 2 mi · Carpenter Pond 2 mi · Hay Pond 3 mi · Chandler Pond 6 mi · Indian Pond 6 mi · Chamberlain Lake 6 mi · Spring Pond 6 mi · Little Reed Pond 6 mi · Upper Bluffer Pond 7 mi · Buckley Pond 7 mi
See how Fourth Lake stacks up: best brook trout lakes in Maine
More water nearby: Piscataquis County fishing maps (191 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.