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Rating depth structure for brook trout.
Shared by DepthScout anglers. Exact spots stay private, always.
8,090-acre lake near Square Lake. The lake tops out around 122 ft. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled. What follows comes from the same scoring engine that paints the spots above.
The drawn water covers 8,067 acres wrapped in 20.4 miles of bank. With a 1.6 development index there's bank structure worth casting at, in moderation. 25% of the surface is littoral (under ~15 ft) — cover, weeds and forage water. Call it 7.2 mi long by 3.3 mi wide at the broadest reach. It sits in Aroostook County. Its nearest charted neighbour, Cross Lake, is 4 mi to the north.
Early season brook trout use the shallows, holding in 2 to 15 ft. Expect a summer slide to 10 to 30 ft, then a winter hold in 3 to 20 ft. Put California Brook inflow first on the milk run — an inflow / creek mouth near 3 ft that grades prime for spring. 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 | 2 to 15 ft | dawn & dusk | California Brook inflow (3 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Goddard Brook inflow (8 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | California Brook inflow (3 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | California Brook inflow (3 ft) | Small jigging spoon, Tungsten jig + plastic |
When the water first warms, burbot slide up into 25 to 70 ft. By summer they slide out to 50 to 120 ft, and by winter most fish are in 15 to 60 ft. If you only fish one area, make it Deep basin: a deep basin around 115 ft that scores prime in summer. In summer the feeding windows fall in after dark and midday. Keep a heavy jig + cut bait rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 25 to 70 ft | night & dusk | Sharp break (29 ft) | Glow jigging spoon + cut bait, Rattle bait (dark) |
| Summer | 50 to 120 ft | night & midday | Deep basin (115 ft) | Heavy jig + cut bait |
| Fall | 30 to 80 ft | night & dusk | Sharp break (29 ft) | Glow spoon + minnow head, Blade bait (slow) |
| Winter | 15 to 60 ft | night & dusk | Rock reef (11 ft) | Glow tungsten + cut bait, Rattle spoon + minnow head |
Come spring, look for brown bullhead tight to the bank in 2 to 8 ft. Expect a summer slide to 3 to 12 ft, then a winter hold in 10 to 25 ft. Start at Back-bay flat. It's a weed flat holding about 2 ft of water and rates prime come spring. Prime time lands in after dark and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | dusk & night | Back-bay flat (2 ft) | |
| Summer | 3 to 12 ft | night & dusk | Shallow bay flat (9 ft) | |
| Fall | 5 to 15 ft | dusk | Shallow bay flat (9 ft) | |
| Winter | 10 to 25 ft | midday | Deep basin (115 ft) |
Early season white perch use the shallows, holding in 4 to 15 ft. Expect a summer slide to 15 to 40 ft, then a winter hold in 20 to 50 ft. Put Goddard Brook inflow first on the milk run — an inflow / creek mouth near 8 ft that grades prime for spring. In summer the feeding windows fall in early morning. Tie on a small spinner rig drifted or a 1/8 oz jigging spoon and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 4 to 15 ft | dusk | Goddard Brook inflow (8 ft) | Small jig + curly tail, Inline spinner (silver) |
| Summer | 15 to 40 ft | dawn | Feeding flat (22 ft) | Small spinner rig drifted, 1/8 oz jigging spoon |
| Fall | 15 to 45 ft | midday | Sharp break (29 ft) | Jigging spoon (small), Blade bait |
| Winter | 20 to 50 ft | dusk | Sharp break (29 ft) | Small rattle spoon, Tungsten + spikes |
Count 16 structure marks on this chart. The deepest, Deep basin, sits near 115 ft.
Access data: OpenStreetMap contributors (ODbL) — community-mapped launches. Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for Maine waters are set by the Maine IFW — and special regulations can apply to Square Lake specifically, so confirm the current rules before you fish.
Check the official Maine fishing regulations →
Square Lake is about 122 ft (37 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, burbot, brown bullhead, white perch on Square Lake.
California Brook inflow is the top-rated area: an inflow / creek mouth in about 3 ft of water that rates prime for brook trout in spring. 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 Square 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.
Cross Lake 4 mi · Carry Pond 5 mi · Eagle Lake 6 mi · Mud Lake 8 mi · Blake Lake 8 mi · Second Sly Brook Lake 9 mi · First Sly Brook Lake 9 mi · Mc Clusky Lake 10 mi · Black Lake 12 mi · Long Lake 13 mi · St Froid Lake 13 mi · Bourgoin Lake 13 mi
See how Square Lake stacks up: best brook trout lakes in Maine · best burbot lakes in Maine · best white perch lakes in Maine · best brown bullhead 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.