The Old Reservoir is a fresh-water pond with a sandy beach that is open seven days per week. It also has a picnic area and is open for fishing. Non-residents are welcome to pay a daily fee to use the facility.
The Lexington Recreation Department sells season memberships to the aquatic facilities, including a limited number of non-resident family memberships that go on sale in March. The swim tag is valid at both the town pool and the Old Reservoir. Residents may opt to pay a daily fee at either facility instead of purchasing a swim tag. As of May 15, 2010, all swim tags must be purchased at the tennis booth located at the pool building. Visit the Web site for pricing information.