Secondary State Highway 2A

SSH 2A was added to the state highway system in 1937. This route began at Jct PSH 2 (US 10) in Renton and headed north via Bellevue and Kirkland to Jct PSH 2 (Bothell branch) on the southwest side of Bothell. At this junction, SSH 2A joined PSH 2 and ran coincident with PSH 2 to Downtown Bothell. At Downtown Bothell, SSH 2A left PSH 2 and headed north, ending at Jct PSH 1 (US 99) in Everett. PSH 2 in Renton became the Renton branch of PSH 2 (Alt US 10)in July 1940 when the first Lake Washington Floating Bridge opened to traffic. The floating bridge became PSH 2 (US 10).

In 1943, the Bothell to Everett portion of SSH 2A was dropped from the state highway system. This section of highway had been part of the original route of the Pacific Highway into the late 1920s.

During the later 1940s and 1950s, SSH 2 was realigned and upgraded to 2 lane expressway standards. In 1957, SSH 2A from Renton to the Totem Lake area was transferred to the Renton Branch of PSH 1 when this highway became part of the I-405 corridor. Former SSH 2A from Bothell to Everett was added back to the state highway system in 1957 as SSH 2J.

In the late 1950s and early 1960s, PSH 1RE/I-405 was to have left SSH 2A north of NE 132nd St in the Totem Lake area and headed northwesterly to I-5 at Alderwood Manor, bypassing downtown Bothell to the west. SSH 2A continued straight north from the Totem Lake area to a temporary connection with PSH 2 between Bothell and Woodinville. The plan was to extend SSH 2A north to the interchange that now connects I-405 and SR 522. In 1963 the plans were changed and SSH 2A from Totem Lake to PSH 2 was transferred to PSH 1RE/ I-405. I-405 ultimately bypassed Downtown Bothell to the east. There is still a wide spot in the I-405 median north of NE 132nd St where the SSH 2A/PSH 1 interchange was to have been built.