Madison Street is a major thoroughfare of Seattle, Washington. The street originates at Alaskan Way on the Seattle waterfront, and heads northeast through Downtown Seattle, First Hill, Capitol Hill, Madison Valley, Washington Park, and Madison Park, ending just east of 43rd Avenue East on Lake Washington. From Broadway to Lake Washington, the street is known as East Madison Street, which accounts for most of its length. It is the only Seattle street that runs uninterrupted from the salt water of Puget Sound in the west to the fresh water of Lake Washington in the east.