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Since incorporation in 1960, the City has consistently made (or required through private development) transportation investments that have preceded and accommodated population and employment growth and its associated traffic growth. This strategy has enabled the City to make significant improvements in the community’s neighborhood streets, arterial roads, pavement markings, streets signs, and pedestrian and bicycle facilities.

In 2017, the City’s primary funding sources for local transportation projects included: gas tax revenues ($510,000), real estate excise tax ($2,845,000), Transportation Benefit District vehicle fees ($370,000) and transportation impact fees ($237,000). In total, the City received approximately $2.7 million (2016) and $4.0 million (2017) in annual transportation revenues.

In addition, Sound Transit mitigation for the closure of the I-90 center roadway is providing up to $5.1 million in funds for operational and safety improvements.

Combined with supplemental federal and state grant funding, Mercer Island has sufficient resources to maintain and improve its transportation system over the next twenty years and will be able to accomplish the following:

Maintain the City’s arterial street system on a 25-year (average) life cycle;

Maintain the City’s residential system on a 35-year (average) life cycle.

Maintain, improve and expand the City’s pedestrian and bicycle system over the next 20 years.

Maintain and improve the transportation system to meet the forecasted housing and employment growth targets.