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Rating depth structure for brook trout.
Shared by DepthScout anglers. Exact spots stay private, always.
194-acre lake near T5 R17 WELS. The lake tops out around 22 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 Saint John Pond draws 192 acres inside 2.8 miles of shoreline. The shoreline is moderately structured (index 1.5) — enough points and pockets to pattern. 78% of the surface is littoral (under ~15 ft) — cover, weeds and forage water. Call it 1.2 mi long by 0.4 mi wide at the broadest reach. You'll find it in Somerset County. Closest neighbour on DepthScout: Third Saint John Pond, 2 mi southwest of here.
In spring, brook trout run shallow here, mostly 2 to 15 ft. Summer pushes them deeper, 7 to 22 ft, and winter fish settle into 3 to 20 ft. Deep basin is the standout, a deep basin at roughly 22 ft, rated prime for summer brook trout. Time it for early morning and the evening. 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 (8 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 7 to 22 ft | dawn & dusk | Deep basin (22 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (8 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Break off the point (16 ft) | Small jigging spoon, Tungsten jig + plastic |
6 pieces of structure are mapped here — Deep basin, around 22 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 Saint John Pond specifically, so confirm the current rules before you fish.
Check the official Maine fishing regulations →
Fourth Saint John Pond is about 22 ft (7 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 Saint John Pond.
Deep basin is the top-rated area: a deep basin in about 22 ft of water that rates prime for brook trout in summer. Every other rated spot, per species and season, is on the map above.
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 Saint John Pond 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.
Third Saint John Pond 2 mi · Lower First St John Pd 4 mi · Upper First St John Pond 4 mi · Second St John Pond 4 mi · Russell Pond 4 mi · Lost Pond 7 mi · Seboomook Lake 10 mi · Foley Pond 11 mi · Lane Pond 11 mi · Dole Pond 15 mi · Baker Lake 15 mi · Canada Falls Lake 17 mi
See how Fourth Saint John Pond stacks up: best brook trout lakes in Maine
More water nearby: Somerset County fishing maps (76 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.