- Denny-Blaine (also known as Harrison) is a neighborhood in east central Seattle, Washington. It is bounded on the east by Lake Washington; on the south by E. Howell Street, beyond which is Madrona; on the west by 32nd Avenue, beyond which is Madison Valley; and on the north by Lake Washington Boulevard E., Hillside Drive E., and E. Prospect Street, beyond which are Washington Park and Madison Park.