Washington State Route 527

State Route 527
Bothell – Everett Highway
SR 527 highlighted in red.
Route information
Auxiliary route of I‑5
Defined by RCW 47.17.745
Maintained by WSDOT
Length:	9.23 mi (14.85 km)
Existed:	1964 – present
Major junctions
South end:	I‑405 in Bothell
	SR 524 in Bothell SR 96 in Everett
North end:	I‑5 / SR 99 / SR 526 in Everett
Highway system
State highways in Washington Interstate US State Scenic Former PSH 1964 renumbering Former ← SR 526 SR 528 →

State Route 527 (SR 527, also known as the Bothell – Everett Highway) is a state highway in Snohomish County, of the U.S. state of Washington. It extends 9.23 miles (14.85 km) north from I-405 in the city of Bothell, Washington, to an interchange with Interstate 5 (I-5), SR 99, and SR 526 in Everett, Washington. SR 527 intersects SR 524 and SR 96 before ending in Everett. The route serves as a connector between Bothell, Everett, and Mill Creek.

The highway itself did not fully open until October 17, 1969, and, since its opening, has become increasingly congested, with about 57,000 motorists using the highway at its interchange with I-405 in 2004. A large construction project to widen the highway and put up sound walls ran from 1991-2006. A 2.69-mile-long (4.33 km) section of the route was turned over to local authorities in 2011.

SR 527 links the cities of Bothell, Everett, and Mill Creek, and intersects two highways: SR 524, and SR 96WSDOT has found that about 46,000 motorists utilize the road daily at I-405 based on average annual daily traffic (AADT) data.

SR 527 starts at a partial cloverleaf interchange with I-405. From the interchange, the road heads northeast to Thrashers Corner, where SR 527 intersects SR 524 before moving on to pass Kennard Corner, Silver Creek Park, North Creek County Park, and Mays Pond Park. The highway then intersects 164th Street SE, a major arterial road, in Mill Creek. Beyond 164th Street SE, the road turns to the north, routing traffic past Mill Creek's town center, Mill Creek Library and Library Park before intersecting a connector to SR 96 westbound. Following the connector, SR 527 intersects SR 96 and runs along the eastern shore of Silver Lake. The route then intersects 112th Street SE, which goes west to the South Everett Freeway Station. From 112th Street, the route continues north to the Eastmount Park and Ride, where it turns northwest toward an interchange with I-5 and then to an intersection with SR 99, SR 526, and Broadway, where it terminates. The road continues west from the intersection as SR 526 (also known as the Boeing Freeway), leading to the Boeing Everett Factory, Paine Field, and Mukilteo, Washington. SR 99 runs south from the intersection to the Everett Mall, Seattle, and Fife. An extension of SR 99, Broadway, continues north from the intersection into downtown Everett.