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30-acre pond near WATERVILLE VALLEY. The lake tops out around 10 ft. The depth chart is built from real state fisheries GPS surveys, so the humps, channels and drop-offs you see are measured, not guessed. Below is the species-by-species picture, pulled from the same data the map uses.
FLAT MOUNTAIN POND maps at 30 acres behind 1.3 miles of shoreline. A middling shoreline index (1.7) gives it some bays to work without being a maze. Nothing on this chart breaks 15 ft, which makes the whole surface littoral: weeds, bait and ambush cover everywhere. End to end it runs roughly 0.6 mi. It sits in Grafton County. UPPER HALL POND sits 6 mi southwest — the closest neighbouring chart.
When the water first warms, brook trout slide up into 1 to 10 ft. There's no big seasonal slide here — summer means 3 to 10 ft, winter 2 to 10 ft. If you only fish one area, make it Deep basin: a deep basin around 10 ft that scores prime in summer. In summer the feeding windows fall in early morning and the evening. Keep a small spoon fished deep or a trolled lake-clear wobbler + worm rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 10 ft | dawn & dusk | Shallow bay flat (2 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 3 to 10 ft | dawn & dusk | Deep basin (10 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 1 to 10 ft | midday & dawn | open water | Small spoon (orange), Spinner |
| Winter | 2 to 10 ft | dawn | Deep basin (10 ft) | Small jigging spoon, Tungsten jig + plastic |
FLAT MOUNTAIN POND carries 3 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 10 ft down.
| Date | Species | Count | Size |
|---|---|---|---|
| Jun 16 | Brook Trout | 3,915 | — |
Source: NH Fish & Game stocking report, retrieved 2026-08-18.
Season dates, license requirements, and size and bag limits for New Hampshire waters are set by the New Hampshire Fish and Game — and special regulations can apply to FLAT MOUNTAIN POND specifically, so confirm the current rules before you fish.
Check the official New Hampshire fishing regulations →
FLAT MOUNTAIN POND is about 10 ft (3 m) deep at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
Anglers target brook trout on FLAT MOUNTAIN POND.
Deep basin is the top-rated area: a deep basin in about 10 ft of water that rates prime for brook trout in summer. Open the map above to see every rated 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.
Yes — per NH Fish & Game stocking report records, FLAT MOUNTAIN POND was most recently stocked Jun 16 with 3,915 brook trout. The full stocking history is listed above.
Fishing on FLAT MOUNTAIN POND is regulated by the New Hampshire Fish and Game. Check the official New Hampshire regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
UPPER HALL POND 6 mi · Dinsmore Pond 7 mi · CHURCH POND 7 mi · Red Hill Pond 8 mi · Bearcamp Pond 8 mi · Barville Pond 9 mi · LITTLE POND (CARROLL) 9 mi · Kusumpe Pond 9 mi · Sawyer Pond 10 mi · Perch Pond 11 mi · Chocorua Lake 11 mi · Berry Pond 11 mi
See how FLAT MOUNTAIN POND stacks up: best brook trout lakes in New Hampshire
More water nearby: Grafton County fishing maps (56 charts). Browse all New Hampshire fishing maps or see every water on DepthScout. Bathymetry credit: state fisheries survey programs. 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.