Located at Daingerfield Island Marina on the Potomac River in Alexandria, this semi-private boat ramp provides access for both experienced boaters and beginners.

The facility offers a public boat ramp along with water and land storage, sailboat rentals (spring to fall), a marina store with supplies, and food options at the Catboat Pizza Bar. The marina is managed by the U. S.

Geological Survey and serves as the largest sailing marina in the Washington area, hosting multiple sailing clubs and offering certified sailing lessons year-round.