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Rating depth structure for largemouth bass.
Recent public catches load as you reach this section.
93-acre lake near Eaton. NH GRANIT / NH Fish & Game survey water. The lake tops out around 55 ft. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled. Here's the year, species by species, as the scoring engine sees it.
The drawn water covers 93 acres wrapped in 1.9 miles of bank. Its 1.4 shoreline index means few bank features; the contours below do the pattern work. Roughly 47% of the water is 15 ft or less, the band where the food chain lives. Tip to tip the water measures near 0.9 mi with a 0.3-mi widest point. Carroll County claims this one. Its nearest charted neighbour, HATCH POND, is 2 mi to the north.
Come spring, look for rainbow trout tight to the bank in 5 to 20 ft. They move out to 8 to 30 ft in summer and finish the year down in 8 to 40 ft. If you only fish one area, make it Break off the point: a drop-off around 19 ft that scores prime in winter. Best bite is early morning and the evening. A dodger + spoon (deep troll) or a flutter spoon is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Main-lake point (7 ft) | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Break off the point (19 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Break off the point (19 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Break off the point (19 ft) | Jigging spoon, Tube jig (white) |
Spring smallmouth bass on Purity Lake hold shallow, usually 3 to 12 ft. By summer they slide out to 10 to 30 ft, and by winter most fish are in 20 to 45 ft. The chart's best answer is Break off the point — drop-off, 19 ft, prime for winter. Prime time lands in early morning and the evening. The summer box starts with a drop shot (goby/minnow) or a ned rig.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dawn & dusk | Main-lake point (7 ft) | Ned rig, Tube jig |
| Summer | 10 to 30 ft | dawn & dusk | Break off the point (19 ft) | Drop shot (goby/minnow), Ned rig |
| Fall | 8 to 25 ft | midday & dawn | Main-lake point (7 ft) | Jerkbait, Blade bait |
| Winter | 20 to 45 ft | midday | Break off the point (19 ft) | Blade bait, Hair jig |
Early season largemouth bass use the shallows, holding in 2 to 10 ft. Expect a summer slide to 8 to 20 ft, then a winter hold in 15 to 35 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 texas-rigged 10" worm or a deep-diving crankbait and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Shallow bay flat (2 ft) | Spinnerbait, Chatterbait |
| Summer | 8 to 20 ft | dawn & dusk | Back-bay flat (8 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Main-lake point (7 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 15 to 35 ft | midday | Break off the point (19 ft) | Blade bait, Jigging spoon |
Spring brown bullhead on Purity Lake hold shallow, usually 2 to 8 ft. They move out to 3 to 12 ft in summer and finish the year down in 10 to 25 ft. Put Shallow bay flat first on the milk run — a weed flat near 2 ft that grades prime for spring. The feeding windows run 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 12 ft | night & dusk | Back-bay flat (8 ft) | |
| Fall | 5 to 15 ft | dusk | Back-bay flat (8 ft) | |
| Winter | 10 to 25 ft | midday | open water |
In spring, chain pickerel run shallow here, mostly 2 to 10 ft. Summer pushes them deeper, 3 to 15 ft, and winter fish settle into 5 to 18 ft. Shallow bay flat is the standout, a weed flat at roughly 2 ft, rated prime for spring chain pickerel. Time it for early morning and the evening. You won't need more than a weedless spoon + trailer or a buzzbait most summer days.
| 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 | 3 to 15 ft | dawn & dusk | Back-bay flat (8 ft) | Weedless spoon + trailer, Buzzbait |
| Fall | 4 to 15 ft | midday & dawn | Back-bay flat (8 ft) | Jerkbait along weed edges, Spinnerbait |
| Winter | 5 to 18 ft | dawn | Back-bay flat (8 ft) | Jigging spoon (through ice) |
Come spring, look for landlocked salmon tight to the bank in 1 to 15 ft. They move out to 17 to 55 ft in summer and finish the year down in 10 to 40 ft. If you only fish one area, make it Deep basin: a deep basin around 55 ft that scores prime in summer. Best bite is early morning and the evening. A dodger + streamer down deep or a thin spoon on lead core is the honest summer answer here.
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 | Main-lake point (7 ft) | Streamer flies (Grey Ghost) off boards, Thin spoon (Mooselook style) |
| Summer | 17 to 55 ft chart-limited; documented 25 to 60 ft | dawn & dusk | Deep basin (55 ft) | Dodger + streamer down deep, Thin spoon on lead core |
| Fall | 5 to 30 ft | dawn & dusk | Main-lake point (7 ft) | Casting spoon at the mouths, Streamers |
| Winter | 10 to 40 ft | dawn | Break off the point (19 ft) | Small jigging spoon, Swedish pimple + smelt |
Purity Lake carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 55 ft down.
Access data: New Hampshire Fish & Game — Public Access Sites. Confirm conditions and fees locally before you launch.
| Date | Species | Count | Size |
|---|---|---|---|
| May 7 | Landlocked Salmon | 315 | — |
| Apr 30 | Rainbow Trout | 750 | — |
Source: NH Fish & Game stocking report, retrieved 2026-09-23.
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 Purity Lake specifically, so confirm the current rules before you fish.
Check the official New Hampshire fishing regulations →
Purity Lake is about 55 ft (17 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, smallmouth bass, largemouth bass, brown bullhead, chain pickerel, landlocked salmon on Purity Lake.
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. The map above holds the full rated-spot list for every 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 NH Fish & Game stocking report records, Purity Lake was most recently stocked May 7 with 315 landlocked salmon. The full stocking history is listed above.
Fishing on Purity Lake 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.
HATCH POND 2 mi · Danforth Pond, Upper 3 mi · Crystal Lake 3 mi · TROUT POND (CARROLL) 3 mi · Danforth Pond, Middle 3 mi · SHAW POND 4 mi · DANFORTH POND, LOWER 4 mi · Silver Lake 4 mi · DUCK POND 5 mi · Berry Bay 5 mi · Pea Porridge Pond, Big 5 mi · Broad Bay 5 mi
See how Purity Lake stacks up: best largemouth bass lakes in New Hampshire · best smallmouth bass lakes in New Hampshire · best rainbow trout lakes in New Hampshire · best landlocked salmon lakes in New Hampshire
More water nearby: Carroll County fishing maps (64 charts). Browse all New Hampshire 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.