Nobody in the Seattle area uses those names. They are always just the I-90 bridge or 520 bridge among the people I talk to, although both roads actually use multiple bridges to span Lake Washington.
Yeah, I had to look up the bridge names. The "I-90 bridge" is actually both the Homer M. Madley and Lacey V Murrow Memorial bridges, and that's excluding the two bridges that are east of Mercer Island. I wanted to be more exact, and at that point I also added the 520 bridge's real name.
