It's the <a href="http://www.kingcounty.gov/environment/wtd/Construction/Seattle/FremontSiphon.aspx">Fremont Siphon replacement project</a>
Fuck what is it with this city and tunnel boring projects?
While it doesn't look like they intend to build or stage directly on the FFP, the Burke will be diverted around the site and a number of trees will be removed.
It might remain possible to get there from the west, but even if they don't fence it off entirely I doubt we'd really be able to use it in our traditional way. I haven't found real construction timelines yet but I'm guessing it'll be at least a year.

