12:56 PM: We’re in the midst of another round of “king tides” – 12.5 feet at midmorning today – and that was not only interesting to see, it also facilitated some work that needed to be done beneath the Alki seawall. Thanks to Buzz Shaw for the photos and report:

For a few weeks now, a large section of marine spill containment boom has been wrapped around the rocks on the beach and the seawall at the 1500 block of Alki Ave. Today, Seattle Parks Dept. staff used two trucks, and a front loader. and lots of effort to remove the 50+-foot long section of the containment boom from the rocks.

We’ll be asking Parks if they know whose boom it was. Removal of marine debris is vital for wildlife protection, among other things.

P.S. Re: the “king tides” – high tide is 12.5 feet again tomorrow, at 11:01 am, and remains above 12 feet at each day’s peak until dropping to 11.9 feet at 3 pm next Thursday (here’s our favorite chart).

ADDED 1:36 PM: Parks spokesperson David Takami responded to our inquiry: “Our crew looked at the boom but couldn’t find any identifying information (company or boat name). We will be disposing of the boom today, and there really aren’t any significant cleanup expenses.”