Site Resources & Tools
Dive planning for Minesweeper
Site Briefing
Minesweeper is a dive site in Central Puget Sound . Lake Washington has at least three WWII-era YMS-class minesweepers on the bottom, in ~200 ft of water off Sand Point / Magnuson Park.
YMS-359 is the positively-identified one -- 136 ft long, 24.5 ft wide, sank after a fire while moored as a private conversion project. Two additional YMS wrecks nearby have been located by JaWS/Innerspace but are not fully identified.
Access: Boat access from Magnuson Park or Kirkland ramps.
Conditions: 200-ft depth -- advanced dive only, trimix and stepped decompression recommended.
Hazards: Freshwater dark and cold; primary + backup lights required. Interior penetration is possible but requires wreck training.
⚠️ Safety & accuracy
Before diving at Minesweeper, always check the site-specific wind/wave forecast, tide/currents, and recent reports ! Reminder: Winds (even offshore winds) can impact slack time.
Briefings may be out of date or have inaccuracies. Dive within your training and experience. The first time diving a site, join someone familiar with the site and/or start on a mild day.
See our currents, tides, wind, and waves guide for help reading charts and planning current-sensitive dives.
The nearest NOAA or XTide current and tide stations within 25 miles are selected by default when available. NOAA stations show charts here; XTide stations link to Dairiki. Click a pin on the map below to choose another station for current, tide, camera, or buoy data (you may need to zoom in or out).
See an issue? Would you suggest a different default station or depth? Suggest briefing updates.
Nearby Stations
Point Jefferson, East of (45 ft) -- 1 mile away
Bangor Wharf -- 12 miles away
Nearest Featured Dive Sites
- Edmonds Underwater Park (~6 miles)
- Shangri La (~11 miles)
Nearby Dive Sites
- Indianola (~3 miles)
- Indianola Wrecks (~3 miles)
- Boeing Creek Reef (~4 miles)