Coastal Dune Lakes

By William Bridge · Updated September 8, 2026

Walton County has 15 named coastal dune lakes, averaging about five feet deep. Start on the quiet western end of 30A: Western Lake at Grayton Beach State Park or Oyster Lake in Dune Allen. September is the month: the Gulf is still 84°F, the Labor Day crowds are gone, and the lakes sit glassy before 9 a.m.

What is a coastal dune lake?

A shallow freshwater lake behind the dunes that periodically opens a channel, called an outfall, into the Gulf and turns brackish after each breach. Walton County protects them as rare habitat: stay off the outfall sand and keep dogs out of the dune grass.

Which dune lake should you visit?

Lake Town Access
Western Lake Grayton Beach / WaterColor State park, $5 per vehicle; BoatHouse rentals
Oyster Lake Dune Allen North side of 30A
Campbell Lake Santa Rosa Beach Topsail Hill Preserve, $6 per vehicle
Eastern Lake Seagrove Beach Public boat ramp

Aerial view of a wooden boardwalk crossing the dunes to a public beach access with a parking lot and yellow flag on the western end of 30A

Dune Allen's beach accesses put a lake on one side of the boardwalk, the Gulf on the other; the 18-mile Timpoochee Trail links every lake above by bike.

Where should you stay for the western-end lakes?

Black modern pine beach house with floor-to-ceiling glass, a wood deck, and a golden retriever sitting on the gravel drive inside the fenced yard

Inkwell Manor is a standalone two-bedroom, two-bath house in Santa Rosa Beach, sleeps six, with a fenced yard and hard floors for the dog that just swam a dune lake. From $250 a night. See it at vacationrentalsin30a.com or book directly on Airbnb.

Coastal dune lake FAQ

Can you swim in the dune lakes? The water is tannin-dark and shallow, so paddleboarding beats swimming.

Are motorboats allowed? Jet skis are banned on every dune lake; Western, Eastern and Powell Lake have public boat ramps.

Which lake is closest to Inkwell Manor? Oyster Lake in Dune Allen, just west on 30A.

Sources: Walton County Coastal Dune Lakes (mywaltonfl.gov), Florida State Parks (floridastateparks.org), Visit South Walton (visitsouthwalton.com), SoWal.com.

William Bridge