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221-acre reservoir near Jaffrey. NH GRANIT / NH Fish & Game survey water. 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. Species by species, here's what the data says the year looks like.
The outline encloses 221 acres, worked by 2.4 miles of shoreline. Its 1.2 shoreline index means few bank features; the contours below do the pattern work. All of it is shallow-zone water — under ~15 ft across the entire basin, so the food chain has the run of the place. Call it 0.8 mi long by 0.8 mi wide at the broadest reach. It sits in Cheshire County. If the bite dies, Gilmore Pond is 1 mi to the west.
Spring largemouth bass on Mountain Brook Reservoir hold shallow, usually 2 to 10 ft. Depth-wise the year is flat: 3 to 10 ft in summer, 3 to 10 ft once it turns cold. Put Shallow bay flat first on the milk run — a weed flat near 2 ft that grades prime for spring. The feeding windows run early morning and the evening. The summer box starts with a texas-rigged 10" worm or a deep-diving crankbait.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Shallow bay flat (2 ft) | Spinnerbait, Chatterbait |
| Summer | 3 to 10 ft | dawn & dusk | Back-bay flat (3 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 3 to 10 ft | midday & dawn | Back-bay flat (3 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 3 to 10 ft | midday | Deep basin (10 ft) | Blade bait, Jigging spoon |
In spring, yellow perch run shallow here, mostly 3 to 10 ft. Summer keeps them at 3 to 10 ft, and they winter in 3 to 10 ft. Spring yellow perch concentrate at Back-bay flat, a prime-rated weed flat around 3 ft. Fish it in early morning and you'll meet the bite. You won't need more than a drop-shot micro plastics or a small spoon tipped with worm most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 10 ft | midday & dawn | Back-bay flat (3 ft) | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 3 to 10 ft | dawn | Deep basin (10 ft) | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 3 to 10 ft | midday | Deep basin (10 ft) | Jigging spoon (small), Perch rig / spreader |
| Winter | 3 to 10 ft | midday & dawn | Deep basin (10 ft) | Tungsten jig + spikes, Rattle spoon (small) |
Spring puts chain pickerel in skinny water — 2 to 10 ft is the zone. Summer fish stay in 2 to 10 ft, and winter fish hold in 3 to 10 ft. Shallow bay flat is the standout, a weed flat at roughly 2 ft, rated prime for spring chain pickerel. Plan around early morning and the evening in the warm months. A weedless spoon + trailer or a buzzbait covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | midday & dawn | Shallow bay flat (2 ft) | Inline spinner (silver), Small spoon (red/white) |
| Summer | 2 to 10 ft | dawn & dusk | Shallow bay flat (2 ft) | Weedless spoon + trailer, Buzzbait |
| Fall | 3 to 10 ft | midday & dawn | Back-bay flat (3 ft) | Jerkbait along weed edges, Spinnerbait |
| Winter | 3 to 10 ft | dawn | Back-bay flat (3 ft) | Jigging spoon (through ice) |
Early season bluegill use the shallows, holding in 1 to 6 ft. Expect a summer slide to 3 to 10 ft, then a winter hold in 3 to 10 ft. Put Shallow bay flat first on the milk run — a weed flat near 2 ft that grades prime for spring. In summer the feeding windows fall in early morning and the evening. Tie on a small sponge spider (fly) or a micro tube jig and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 6 ft | midday & dusk | Shallow bay flat (2 ft) | 1/32 oz jig + micro plastic, Tiny popper (evenings) |
| Summer | 3 to 10 ft | dawn & dusk | Back-bay flat (3 ft) | Small sponge spider (fly), Micro tube jig |
| Fall | 3 to 10 ft | midday | Back-bay flat (3 ft) | Micro jig + waxworm, Small spoon tipped |
| Winter | 3 to 10 ft | midday | Deep basin (10 ft) | Tungsten ice jig + plastic, Tiny spoon |
Come spring, look for white perch tight to the bank in 3 to 10 ft. Through summer count on 3 to 10 ft; the winter hold is 3 to 10 ft. Start at Deep basin. It's a deep basin holding about 10 ft of water and rates prime come summer. Prime time lands in early morning. A small spinner rig drifted or a 1/8 oz jigging spoon is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 10 ft | dusk | Back-bay flat (3 ft) | Small jig + curly tail, Inline spinner (silver) |
| Summer | 3 to 10 ft | dawn | Deep basin (10 ft) | Small spinner rig drifted, 1/8 oz jigging spoon |
| Fall | 3 to 10 ft | midday | Deep basin (10 ft) | Jigging spoon (small), Blade bait |
| Winter | 3 to 10 ft | dusk | Deep basin (10 ft) | Small rattle spoon, Tungsten + spikes |
Early season brown bullhead use the shallows, holding in 2 to 8 ft. Expect a summer slide to 3 to 10 ft, then a winter hold in 3 to 10 ft. Put Deep basin first on the milk run — a deep basin near 10 ft that grades prime for winter. In summer the feeding windows fall in after dark and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | dusk & night | Shallow bay flat (2 ft) | |
| Summer | 3 to 10 ft | night & dusk | Back-bay flat (3 ft) | |
| Fall | 3 to 10 ft | dusk | Deep basin (10 ft) | |
| Winter | 3 to 10 ft | midday | Deep basin (10 ft) |
Mountain Brook Reservoir also holds pumpkinseed (2 to 10 ft in summer), crappie (3 to 10 ft in summer). Pick any of them on the map above for rated spots and bait picks.
Structure-wise the chart holds 3 features, led in depth by Deep basin at roughly 10 ft.
Access data: New Hampshire Fish & Game — Public Access Sites. Confirm conditions and fees locally before you launch.
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 Mountain Brook Reservoir specifically, so confirm the current rules before you fish.
Check the official New Hampshire fishing regulations →
Mountain Brook Reservoir 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 largemouth bass, yellow perch, chain pickerel, bluegill, white perch, brown bullhead, pumpkinseed, crappie on Mountain Brook Reservoir.
Shallow bay flat is the top-rated area: a weed flat in about 2 ft of water that rates prime for largemouth bass in spring. Scroll up to the map for the complete spot list by species and season.
For largemouth bass, 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 Mountain Brook Reservoir 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.
Gilmore Pond 1 mi · Contoocook Lake 2 mi · Pool Pond 2 mi · Pearly Lake 2 mi · Grassy Pond 3 mi · Bullet Pond 3 mi · Emerson Pond 4 mi · Thorndike Pond 4 mi · Frost Pond 4 mi · CROWCROFT POND 4 mi · Hubbard Pond 4 mi · SCOTT POND 4 mi
See how Mountain Brook Reservoir stacks up: best largemouth bass lakes in New Hampshire · best crappie lakes in New Hampshire · best bluegill lakes in New Hampshire · best yellow perch lakes in New Hampshire
More water nearby: Cheshire County fishing maps (61 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.