Harbor Island Marina, 6 July 2011.Docks at Harbor Island Marina in Seattle

Harbor Island in West Seattle, WA means the best moorage can be just minutes away from saltwater and Elliott Bay. Located south of downtown Seattle on the Duwamish River, Harbor Island Marina is convenient to West Seattle neighborhoods and the South Sound. The freshwater marina provides permanent monthly moorage for 77 vessels ranging from 24 to 70 feet.

Harbor Island Marina is a public marina with an accessible pumpout open year-round, 24 hours a day. A slip is available for pumpout usage. There is a stationary pumpout on the dock. This facility has a Porta-Potty dump station.

Overnight moorage is available for a fee. There are 80 guest moorage slips available. The total estimated guest boat capacity is 90. Electrical hook up is available for a fee. Electrical power is available in 30 and 50 amps. It has been reported that the minimum depth at mean low tide is 12 feet.

Slip Size Monthly Rate/Ft * Monthly Total *
24′ $ 10.16 $243.73
26′ $ 10.16 $264.05
32′ $ 10.16 $324.98
40′ $ 10.36 $414.35
50′ $ 10.55 $527.53
*Includes 12.84% leasehold tax.  Rates based on slip size.


  • Year-round
  • Vessels up to 70′


  • 30 amp
  • Metered at each slip

Services and Amenities:

  • Brackish moorage (freshwater/saltwater mix)
  • Locked gates
  • Power and water at every slip
  • Free parking
  • Restrooms and showers
  • Free sewage pump-out

Harbor Island Marina, 6 July 2011.
Harbor Island Marina in Seattle, WA