Transit Development Plan

About these documents

As a regional transit authority, Sound Transit is required to prepare a six-year transit development plan and annual report. This document provides updated information to the Washington State Department of Transportation (WSDOT) on the development of the various transit components undertaken by Sound Transit - the Central Puget Sound Regional Transit Authority. WSDOT uses these documents to prepare an annual report for the Washington State Legislature summarizing the status of public transportation systems in the state.

Current Documents

The Transit Development Plan (TDP) 2017-2022 and 2016 Annual Report (PDF, 3 MB) provides background information on Sound Transit, in addition to a summary of accomplishments during 2016 and proposed action strategies from 2017-2022 to complete Sound Move, Sound Transit 2 and Sound Transit 3.

Previous Years

For more information on the Transit Development Plan, or to submit any comments, please contact us at 1-866-940-4387 or

Sound Transit documents which are not currently available online may be reviewed at Sound Transit's offices. Contact us for more information.