ABOUT

The I-90 sunken bridge in Lake Washington is a low-visibility, freshwater dive. Bridge sections on the Lacey V. Murrow Memorial Bridge sank after taking on water on November 25, 1990. Today, divers explore the site via a guideline which terminates at a large grated bridge section.

DIRECTIONS

Navigate to South Day Street Park in Seattle, WA

• From I-5, take I-90 East to Ranier Ave. S.
• Left at McLellan St., go past stop sign, continue past light.
• Left at next stop sign, there is a park there.
• Left at next stop sign (Seward Park) approximately 1/2 mile to the bridge.
• You'll find a small parking lot on the right, just under the bridge.

Google Maps link - https://www.google.com/maps/place/South+Day+Street+Park/@47.5904716,-122.2891222,17z/data=!3m1!4b1!4m6!3m5!1s0x54906af0d1fbcc3d:0x167e53b2b5b321d4!8m2!3d47.5904716!4d-122.2865473!16s%2Fg%2F11gzmd0x5?entry=ttu&g_ep=EgoyMDI2MDcwOC4wIKXMDSoASAFQAw%3D%3D

DIVE PROFILE

Assemble your gear in the parking lot. Surface swim to the southern-most pillar, second pillar in the water from the shoreline.

Once you’ve reached this pillar, drop down (see the red circle in the image above) and locate the poles with attached line. The line is approximately 2 feet off of the ground. You’ll find all kinds of bottles, hubcaps, and other debris. At the end of the line, you’ll see a sloped bridge section. Maximum depth is approximately 70-80 feet.

HAZARDS

Low visibility caused by silt is a factor at this site. Use the frog kick to propel yourself and practice good bouyancy to stay off of the bottom of the lake. The lake is quite dark, with visibility dropping off at around 20 feet.

Cable or debris entanglement is a safety concern which can be mitigated by diving in buddy pairs and staying away from the bottom of the lake. Bringing a cutting tool is also advised.

Watercraft could present a hazard. Mitigate this by deploying your SMB and look up as you ascend.

FACILITIES & SERVICES

There are no restrooms at this park. A pee-valve is helpful.