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Rating depth structure for brook trout.
Shared by DepthScout anglers. Exact spots stay private, always.
97-acre lake near T4 R5 NBKP. The lake tops out around 15 ft. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled. The season-by-season read for each species follows, from the map's own numbers.
The drawn water covers 96 acres wrapped in 2.5 miles of bank, with a single island in the mix. With a 1.8 development index there's bank structure worth casting at, in moderation. End to end it runs roughly 0.8 mi, about 0.4 mi across. Somerset County claims this one. If the bite dies, Upper Dingley Pond is 1 mi to the southwest.
Early season brook trout use the shallows, holding in 2 to 15 ft. Even in summer they hold at 5 to 15 ft; winter keeps them in 2 to 15 ft. The chart's best answer is Deep basin — deep basin, 13 ft, prime for summer. Best bite is 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 | 2 to 15 ft | dawn & dusk | Main-lake point (3 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 5 to 15 ft | dawn & dusk | Deep basin (13 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (3 ft) | Small spoon (orange), Spinner |
| Winter | 2 to 15 ft | dawn | Deep basin (13 ft) | Small jigging spoon, Tungsten jig + plastic |
6 pieces of structure are mapped here — Deep basin, around 13 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 Big Grenier Pond specifically, so confirm the current rules before you fish.
Check the official Maine fishing regulations →
Big Grenier Pond is about 15 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 Big Grenier Pond.
Deep basin is the top-rated area: a deep basin in about 13 ft of water that rates prime for brook trout in summer. The interactive chart above rates every spot for each 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 Big Grenier 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.
Upper Dingley Pond 1 mi · Little Dingley Pond 1 mi · Dingley Pond 2 mi · Fisher Pond #2 2 mi · Penobscot Lake 3 mi · Frost Pond 3 mi · Dole Pond 3 mi · Clish Pond 4 mi · Cheney Pond 5 mi · Dubois Pond 6 mi · Mary Petuche Pond 6 mi · Upper Wellman Pond 6 mi
See how Big Grenier 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.