SR 520 Investment Grade Traffic and Revenue Study

A portion of the construction funds needed to replace the SR 520 bridge will come from toll revenue. The Washington State Department of Transportation conducted an investment grade study to determine if enough vehicles will use the bridge once tolling begins to help finance these improvements and pay back construction bonds sold.

The study provides an extremely conservative estimate of what traffic might do to assure investors that a project isn’t overstating the amount of money collected through tolls. What we learned is that even if half of the vehicles that currently drive across the bridge don’t do it anymore, there’s still enough vehicles crossing the bridge and paying tolls to repay the construction bonds needed to build a new floating bridge and make improvements in the corridor.

View the report
Final Report (PDF 8.95 MB)

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Jennifer Charlebois