Whitehall Reservoir is a 620-acre great pond located about a quarter-mile south of MA-135 and a mile west of I-495 in Hopkinton. The reservoir lies within Whitehall State Park thus its immediate shoreline is not developed although houses and roads may be seen a short distance from the shore in some locations.

The entire shoreline is accessible via trails that encircle the reservoir.

The AllTrails website has a description and map of a hike at Whitehall Reservoir.