Auxiliary route of I-90
|Defined by RCW 47.17.825, maintained by WSDOT|
|Length:||16.20 mi (26.07 km)|
|West end:||I-5 in Tukwila|
| SR 167 in Renton
I-405/SR 169 in Renton
|East end:||I-90 in Issaquah|
State Route 900 is a state highway in the state of Washington, USA, getting its number as the westernmost spur of Interstate 90. It extends 16.20 miles (26.07 km) from I-5 in Tukwila east to I-90 in Issaquah.
SR 900 begins at the intersection with Ryan Way at I-5 exit 157, near the southeast corner of Boeing Field. It heads south on Martin Luther King Jr. Way (formerly Empire Way), with ramps to and from I-5, before splitting from the alignment of I-5 and heading east into Renton (with a short section in Seattle). It heads into downtown Renton on Sunset Boulevard. At State Route 167, a one-way pair begins, with eastbound SR 900 on Third Street and westbound SR 900 on Second Street. At State Route 515, SR 900 heads northeast on Houser Way (eastbound) and Bronson Way (westbound), and after a block SR 900 east turns north on Mill Avenue to rejoin the westbound side on Bronson Way.
Just before Bronson Way crosses under I-405, SR 900 turns north along the west-side frontage road, Sunset Boulevard. Sunset crosses to the east side of I-405 and then turns east, however SR 900 enters I-405 for a one mile (1.6 km) overlap, exiting once again at Park Ave N. SR 900 turns east onto Park Ave N, which again becomes NE Sunset Blvd, taking SR 900 between the slopes of Cougar Mountain and Squak Mountain to its end at I-90 in Issaquah (though the name changes to Renton-Issaquah Road). Lake Sammamish State Park lies right across I-90 from the end of SR 900.
The entire route is in King County.
|Tukwila||0.00||M. L. King Way||Continuation beyond Boing Access Road|
|0.00||Boeing Access Road to Airport Way, East Marginal Way||Former SR 181|
|0.19||I-5 north – Seattle||Interchange|
|0.65||I-5 south – Portland||Interchange; eastbound exit and westbound entrance|
|Renton||3.97||SR 167 (Rainier Avenue) to I-405|
|4.56||SR 515 (Main Street)|
|5.40||SR 169 south to I-405 – Maple Valley, Enumclaw, Everett, Seattle, Tacoma|
|Houser Way Bypass||Interchange; eastbound exit and westbound entrance|
|5.62||Sunset Boulevard Northeast|
|5.62||I-405 south – Tacoma||West end of I-405 overlap; interchange; westbound exit and eastbound entrance|
|6.52||I-405 north – Everett||East end of I-405 overlap; interchange|
|Issaquah||16.20||I-90 – Seattle, Spokane||Interchange|
|16.20||Lake Sammamish State Park||Continuation beyond I-90|
||State highways in Washington related to I-90|
|SR 900 - SR 902 - SR 903 (Spur) - SR 904 - SR 906 (Spur) - SR 908|
|Former or proposed state routes: SR 901 - SR 920|