Lake Gardner is a long, narrow lake formed by a dam on the Powow River. It stretches from Amesbury center to the New Hampshire border. The lake has a rich and interesting history, and is currently used for passive recreation. Homes line its western shore, and a sandy public swimming beach is at the southern end. The eastern and northern shores are undeveloped conservation land made up of woods and other open space.
The Lake Gardner Beach swimming area is accessed by car from an entrance on High Street. The public can launch small boats such as canoes, kayaks, small sail craft, and other car top boats from the northern end of the beach. Jet-skis are strictly prohibited and the use of powerboats is limited to those who live on the lake.
Lifeguards and bathrooms are provided during the summer.
During the swimming season, volunteers from Lake Gardner Improvement Association perform water testing to ensure the health and safety of the swimming beach. Results are posted at the beach.