Here’s the general wsdot email. You may get the ferry information you’re looking for. I checked the job list and there isn’t much there, but the pay is OK.
I graduated from Seattle Maritime in 2003 as an AB and spent the next fifteen years, on and off, on contaniner ships, Cruise Ships, NOAA, and Military Sealift Command. Opportunities for deep sea work are getting fewer and fewer as the US fleet shrinks and crews get smaller, which causes serious safety issues. Go for the ferries. They’re hurting for engineers.