This street in the Washington Park neighborhood runs ⅖ of a mile from Lake Washington Boulevard E and E Harrison Street in the south to 39th Avenue E in the north, about where E Ward Street would be if it extended that far east. It was created in 1906 as part of the (I’m going to use its full name!) Replat of John J. McGilvra’s Addition to the City of Seattle and Blocks 13, 14, 18, 20 to 29 Inclusive, and South Half of 19 of John J. McGilvra’s Second Addition to the City of Seattle. It once began farther south, at 39th Avenue E and McGilvra Boulevard E, but this portion is now part of Lake Washington Boulevard E.
The street was so named for running along the eastern side of the unnamed hill at the center of the Washington Park neighborhood.