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Rating depth structure for rainbow trout.
Recent public catches load as you reach this section.
20,300-acre lake near Eustis. The lake tops out around 48 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.
Traced from the shoreline, Flagstaff Lake runs 16,926 acres with 109.3 miles of edge, with 4 islands in the mix. A development index of 6 means a maze of bays and points: far more casting targets than a round bowl of the same size. 50% of the surface is littoral (under ~15 ft) — cover, weeds and forage water. End to end it runs roughly 14.8 mi, about 7.6 mi across. You'll find it in Somerset County. For a second option, Deer Pond lies 9 mi northwest.
Spring puts rainbow trout in skinny water — 5 to 20 ft is the zone. As the season builds they drop to 8 to 30 ft, wintering in 8 to 40 ft. Winter rainbow trout concentrate at Break off the point, a prime-rated drop-off around 16 ft. Warm-month bites cluster around early morning and the evening. A dodger + spoon (deep troll) or a flutter spoon covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | South Branch Dead River inflow (3 ft) | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Break off the point (16 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Rock reef (8 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Break off the point (16 ft) | Jigging spoon, Tube jig (white) |
Spring puts landlocked salmon in skinny water — 1 to 15 ft is the zone. As the season builds they drop to 14 to 48 ft, wintering in 10 to 40 ft. Spring landlocked salmon concentrate at South Branch Dead River inflow, a prime-rated inflow / creek mouth around 3 ft. Warm-month bites cluster around early morning and the evening. A dodger + streamer down deep or a thin spoon on lead core covers the summer program.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 15 ft | dawn & dusk | South Branch Dead River inflow (3 ft) | Streamer flies (Grey Ghost) off boards, Thin spoon (Mooselook style) |
| Summer | 14 to 48 ft chart-limited; documented 25 to 60 ft | dawn & dusk | Deep basin (46 ft) | Dodger + streamer down deep, Thin spoon on lead core |
| Fall | 5 to 30 ft | dawn & dusk | South Branch Dead River inflow (3 ft) | Casting spoon at the mouths, Streamers |
| Winter | 10 to 40 ft | dawn | Break off the point (16 ft) | Small jigging spoon, Swedish pimple + smelt |
Count 17 structure marks on this chart. The deepest, Deep basin, sits near 46 ft.
Access data: Maine GeoLibrary — Boat Launches (Maine IF&W / DACF). Confirm conditions and fees locally before you launch.
| Date | Species | Count | Size |
|---|---|---|---|
| May 26 | Landlocked Salmon | 1,000 | ~6" |
Source: Maine IFW stocking report, retrieved 2026-09-23.
Season dates, license requirements, and size and bag limits for Maine waters are set by the Maine IFW — and special regulations can apply to Flagstaff Lake specifically, so confirm the current rules before you fish.
Check the official Maine fishing regulations →
Flagstaff Lake is about 48 ft (15 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 rainbow trout, landlocked salmon on Flagstaff Lake.
South Branch Dead River inflow is the top-rated area: an inflow / creek mouth in about 3 ft of water that rates prime for landlocked salmon in spring. The interactive chart above rates every spot for each species and season.
For rainbow 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.
Yes — per Maine IFW stocking report records, Flagstaff Lake was most recently stocked May 26 with 1,000 landlocked salmon. The full stocking history is listed above.
Fishing on Flagstaff 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.
Deer Pond 9 mi · Butler Pond 9 mi · Parker Pond 9 mi · Everett Pond 10 mi · Helen Pond 10 mi · High Pond 11 mi · Dixon Pond 12 mi · Pickerel Pond 13 mi · Grass Pond 13 mi · Spencer Lake 14 mi · Butler Pond 15 mi · Gordon Pond 15 mi
See how Flagstaff Lake stacks up: best rainbow trout lakes in Maine · best landlocked salmon lakes in Maine
More water nearby: Somerset County fishing maps (76 charts). Browse all Maine fishing maps. 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.