Ok, I’m late on this story. About 80 years late. The Seattle Municipal Archives just put up a photo of a proposed bridge to Seward Park back in 1927:
Looks like it was going to come in right around 50th St. Apparently they were investigating a tunnel at about the same time.
Either one of those sure would have changed the character of mid-Island. West Mercer would probably be a much more major thoroughfare if this had happened. I’ve got no info on why it didn’t.
A new post on the Mercer Island School District blog profiles Lakeridge 2nd-grade teacher Polly Giovanelli. The blog typically does great short profiles like this, great for parents and others interested in the MISD.