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Mount Baker Tunnel

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description Mount Baker Tunnel Overview

The Mount Baker Tunnel is a major vehicular tunnel carrying Interstate 90 beneath the Mount Baker Ridge in Seattle, Washington. It functions as a crucial component of the cross-Lake Washington corridor that connects downtown Seattle to the city's eastern suburbs. The tunnel feeds directly into the Lacey V. Murrow Memorial Bridge, facilitating a combined road and rail transit route.

It serves thousands of daily commuters and travelers navigating the broader Puget Sound region.

help Mount Baker Tunnel FAQ

What interstate highway runs through the Mount Baker Tunnel?

The Mount Baker Tunnel carries Interstate 90 beneath the Mount Baker Ridge in Seattle, Washington. I-90 is the longest interstate highway in the United States, stretching from Seattle all the way to Boston, Massachusetts.

How does the Mount Baker Tunnel connect to the floating bridges on Lake Washington?

The tunnel is part of the I-90 corridor that connects Seattle to the Eastside suburbs via the Lacey V. Murrow Memorial Bridge and the Homer M. Hadley Memorial Bridge, two of the longest floating bridges in the world. Traffic exits the tunnel on the Seattle side and proceeds eastward across Lake Washington on these floating structures.

When was the original Mount Baker Ridge Tunnel built?

The original Mount Baker Ridge Tunnel was constructed in conjunction with the Lacey V. Murrow Memorial Bridge, which opened in 1940 across Lake Washington. A second tunnel bore was later added as part of I-90 corridor expansion projects to increase capacity between Seattle and the growing Eastside cities like Bellevue.

Can pedestrians and cyclists use the I-90 corridor through the Mount Baker Tunnel area?

The Mount Baker Tunnel itself is restricted to motor vehicle traffic, but the broader I-90 corridor includes a dedicated pedestrian and bicycle path that crosses Lake Washington via the floating bridges. This trail provides a non-motorized connection between Seattle and Mercer Island for cyclists and walkers.

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