Pond · Groton, Middlesex, Massachusetts

Knops Pond / Lost Lake

Back to all lakesSource Information (opens in a new tab)Regulations (opens in a new tab)

Knops Pond / Lost Lake

Pond · Massachusetts

Information Only

StrikeTracks does not currently provide a live condition rating for this destination. Destination and fishery information is still available.

Weather Near Lake

Loading weather…

Fishery Profile

Documented species you may encounter at Knops Pond / Lost Lake.

High confidenceLast verified: Jul 11, 2026

Species images are AI-generated illustrations for visual reference and may simplify natural variation. Fishery records are based on the cited agency sources. About fish illustrations

Fishery overview

Knops Pond / Lost Lake in Groton is a connected MetroWest pond system stocked with trout and also offering largemouth bass and panfish. No live USGS lake/reservoir continuous water observations are assigned; conditions rely on weather-by-coordinates.

Target species

  • Rainbow Trout

    Oncorhynchus mykiss

    Expectation
    Primary
    Population
    Stocked
    Native status
    introduced
    Confidence
    High confidence
    Stocked · Spring, FallSpring, Fall

    MassWildlife states the lake is stocked with trout in spring and fall.

    Source: MassWildlife

  • Brown Trout

    Salmo trutta

    Expectation
    Common
    Population
    Stocked
    Native status
    introduced
    Confidence
    High confidence
    Stocked · Spring, FallSpring, Fall

    MassWildlife trout program includes brown trout among stocked trout species.

    Source: MassWildlife

  • Largemouth Bass

    Micropterus nigricans

    Expectation
    Common
    Population
    Established
    Native status
    introduced
    Confidence
    High confidence

    MassWildlife names excellent fishing for largemouth bass at Knops Pond / Lost Lake.

    Source: MassWildlife

Fishery characteristics

Composition
Mixed wild and stocked

Connected Groton ponds totaling about 217 acres with stocked trout and warmwater bass/panfish habitat.

Best seasons

  • Spring
  • Summer
  • Fall

Common techniques

  • Boat fishing
  • Fly fishing
  • Shore fishing
  • Spinning

Access and Public Fishing Rights

MassWildlife documents a paved boat ramp on the northeast side of Lost Lake. Confirm current ramp and parking status on the official MassWildlife Knops Pond map.

Stocking information

Stocked with trout in spring and fall per MassWildlife. Confirm current stockings on the official MassWildlife trout stocking report.

  • Rainbow Trout

    Stocked · MassWildlife

    Stocked · Spring, Fall

  • Brown Trout

    Stocked · MassWildlife

    Stocked · Spring, Fall

Official sources

Verify current MassWildlife freshwater fishing regulations for Knops Pond / Lost Lake before fishing.

Hatch Match

No destination-specific hatch data is currently available.

General fly suggestions

  • Midge larvaGeneral stillwater midge-style family — not a live Chironomidae Hatch claim.
  • Woolly-bugger-style streamerGeneral stillwater streamer family. Not a baitfish or kokanee Hatch event.
  • Ant or beetleGeneral shoreline terrestrial family — not a local Hatch calendar.

These are general fishing suggestions, not a report of insects currently hatching at this destination.

Location and Access

Cataloged lake location

Groton, Middlesex, Massachusetts

Loading map…
Get Directions to Map Location (opens in a new tab)View Official Access Information (opens in a new tab)

The map marker represents the cataloged waterbody or monitoring location and may not indicate legal parking or public access. Confirm access through the official information before visiting.

Lake Details

Town

Groton

County

Middlesex

Surface Area

217 acres

Target Species

Trout, Largemouth Bass, Panfish

Public Access

Public

Boat Launch

Available

Description

Connected Knops Pond and Lost Lake in Groton. MassWildlife pond map lists 217 acres with a paved boat ramp on the northeast side of Lost Lake. MassWildlife narrative states maximum depth is just over 30 ft and average depth is less than 10 ft; because those values are not exact figures, depth fields are left blank. Stocked with trout in spring and fall and also offers largemouth bass and panfish per MassWildlife. Coordinates from the MassWildlife Knops Pond (Lost Lake) pond map.