State Route 520 Bridge

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Health Impact Project

The Seattle and King County Public Health Department, in collaboration with the Puget Sound Clean Air Agency, conducted an HIA to evaluate the health impacts of the State Route 520 bridge replacement and HOV project. The HIA focused on several pathways and health issues including air quality, carbon emissions, traffic injury and opportunities for physical activity. The HIA made several recommendations to reduce the negative effects on air quality including that new or retrofitted diesel powered construction vehicles and equipment be used during the construction phase. The HIA also recommended that connected walking and bicycling facilities be installed throughout the corridor to promote physical activity.


This Health Impact Assessment Report first appeared in The Cross-Sector Toolkit for Health. The Cross-Sector Toolkit for Health was originally developed by the Health Impact Project, formerly a collaboration of the Robert Wood Johnson Foundation and The Pew Charitable Trusts. The creation of this resource was supported by a grant from the Health Impact Project. The views expressed are those of the author(s) and do not necessarily reflect the views of The Pew Charitable Trusts, or the Robert Wood Johnson Foundation.

 Related Topics

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Physical Activity

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Traffic Safety

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Older Adults

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Clean Air

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Children and Youth

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Active Transportation

Resources & Tools

First page of the document SR 520 Health Impact Assessment
SR 520 Health Impact Assessment
Resource - Assessment