Knops Pond, MA

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Knops Pond


Town(s): Groton MA
County: Middlesex
Local Name: Lost Lake

Size: 205 acres
Average Depth: 6 feet
Maximum Depth: 30 feet

Boating Allowed: Kayaks, Canoes, Sail Boats, Electric Motor Boats, Power Boats, Jet-skis, State & Local Rules & Regulations Apply, Other Restrictions
Swimming: Swimming Allowed, No Restrictions

Click to visit this lake's association site!



Knops Pond is actually two ponds that are connected to each other. The north pond is Lost Lake and is very shallow at only about 5 feet average. The south pond or Knops Pond is about 6 feet deep on average but contains a deep 30 foot hole on the ponds east side. The pond does have its share of non-native aquatic vegetation but it is fully recreational year round. Efforts to contain the milfoil weeds are on-going. There is a mix of both seasonal and year-round homes. The town of Groton formed a “Great Pond Advisory Committee” whose purpose is to research the history of weed management at the lakes, investigate current weed management methodology, mindful of the lake's proximity to the primary water resource district and make appropriate recommendations to the Board of Selectmen regarding weed management of Lost Lake and Knops Pond and is also charged with researching issues of lake management that relate to health, safety, water quality, environmental protection and the preservation and protection of property values of the Great Ponds located within Groton and make recommendations to the Board of Selectmen in order to provide for a balanced targeted usage appropriate for each water body's unique situation. The present uses of Lost Lake / Knopp's Pond are mainly swimming, boating, fishing and skating. Swimming is a very popular activity due to the usually clear water conditions. There is a public beach maintained on the lake, a large institutional beach (Grotonwood), a "locals" beach, and numerous small private beaches. The public beach is Sargisson Beach, located on the southeast shore of Knopp's Pond. This beach is opened for use during the summer months, and swimming lessons are conducted there. The Grotonwood beach is located on the western shore of Lost Lake, and is used by the guests of the camp. Another small beach is located at the northern end of Lost Lake near the outlet structure. This beach, locally nicknamed "Baby Beach," has limited access and is used only for local resident bathing. A floating dock usually is placed just offshore during the summer. Fishing is a very popular spring and summer activity, due to state stocking and the easy access to the lake off Route 119. A developed boat launch, originally created by the Squannacook Rod and Gun Club (MA DFW, 1960) is located on the northeast side of Lost Lake, in a secluded cove. Trout are stocked in the spring, and this is the period of greatest fishing activity. Boating is a preferred activity and ranges from powered boats to rowboats or canoes to sailboats. Water-skiing down the length of Lost Lake is a popular activity. Restriction of this activity in Knopp's Pond is mandated by the placement of two low speed (6 mph) checkpoints, marked by warning buoys. Activity tends to be concentrated in the late afternoon and evening hours, as well as the weekend. Small sailboats are occasionally seen on the lake, and jetskis are in evidence. There is a rental boat livery on the southern end of Knopp's Pond which provides rowboats. The "Groton Lakes Association" is a "non-profit organization" dedicated to the preservation and improvement of the Lakes of eastern Groton, primarily "Lost Lake," "Knopp's Pond," and their coves.

Water Quality: Unknown, Town/State Monitoring
Vegetation Growth: Moderate
Non-native Species: Eurasian Watermilfoil (Myriophyllum Spicatum)

Fishing Comments: This is an excellent seasonal trout pond. Ice fishing is also popular here with Yellow Pearch a favorite catch via jigging.
Fish Species: Largemouth Bass, Chain Pickerel, Brook Trout, Brown Trout, Rainbow Trout, Yellow Perch, Brown Bullhead, Yellow Bullhead, Sunfish, Bluegill

Boat Access: Access for Power and Non-power Boats
Ramp Comments: There is a concrete ramp off Lost Lake Drive at the north end of the pond.
Parking Spaces: Less than 10

Directions: Route 495 to exit 31 (Route 119 W), right on Whiley Road, right on forlk, first left after Deer Run Road.
Shoreline Development: 50-75%