Thurston County facilities are now open to the public with restrictions, including maintaining physical distancing of at least six feet at all times and, per the Washington State Secretary of Health’s face covering order wearing a cloth face covering or mask. If you come to county facilities, please be prepared for potentially long wait times or lines due to distancing guidelines. We continue to encourage residents to access county services online, by phone, by email, or through the use of drop boxes located outside of county buildings.
The availability of remote services vary by office and department.

Click here for office and department contact information
Click here for information on COVID-19

Past Drainage Manuals

The 2016 Drainage Manual is the current standard, in use since December 31, 2016.  Prior to that, the 2009 Drainage Manaul was the standard, and before that, the 1994 Drainage Manual.  

The 2009 manual contained special provisions relating to development in the Salmon Creek Drainage Basin (beginning on page 271); the Green Cove Creek Basin (beginning on page 295); and the McAllister/Eaton Creek Basin (beginning on page 308).


Entire 2009 Drainage Manual (PDF)  |  Individual Volumes of the 2009 Drainage Manual  |  Documents Related to the 2009 Drainage Manual  |  1994 Drainage Manual (PDF)