Interstate 90 in Washington

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Interstate 90 Main route of the Interstate Highway System
Maintained by WSDOT
Length:	296.92 mi[1] (477.8 km)
West end:	SR 519 in Seattle, WA
East end:	I-90
State highways in Washington < I-82 SR 92 > Lists: current - 1937-70 - 1964 renumbering

Within the U.S. state of Washington, Interstate 90 spans 296.92 miles (477.85 km). In 2003, the Seattle terminus was re-engineered to better accommodate traffic from the two nearby sports stadiums. I-90 westbound still ends at its previous location next to Qwest Field, but eastbound begins about 1/4 mile (0.4 km) south at Edgar Martínez Drive S. near the roof shed of Safeco Field at an interchange with 4th Avenue S.

I-90 incorporates two of the longest floating bridges in the world, the Lacey V. Murrow Memorial Bridge and the Homer M. Hadley Memorial Bridge, which cross Lake Washington from Seattle to Mercer Island, Washington. They are the second and fifth longest such bridges, respectively.

Forty-two miles east of Bellevue, at milepost 53, I-90 traverses the Cascade Mountains via Snoqualmie Pass, elevation 3,022 feet, the only interstate crossing and second-lowest east-west crossing in Washington State.^[2]

In 1980, I-90 from Seattle to Thorp was designated the Mountains to Sound Greenway to protect its outstanding scenic and cultural resources.^[3]

The Washington section of I-90 is also defined as State Route 90 by Washington Revised Code § 47-17-140.[1]

Contents 1 Route description 2 Exit list 3 Rest Areas and Weigh Stations 3.1 Rest Areas 3.2 Weigh Stations 4 References

[edit] Route description

Prior to 2003, Interstate 90 used to end at a signalled intersection with 4th Avenue S. However, increasing traffic from Downtown Seattle, Colman Dock, Safeco Field, and Qwest Field forced city, county, and state officials to look for improvements to the area. The first stage of the improvements, the SR 519 South Seattle Intermodal Access Project[2], included the construction of a new on-ramp to Interstate 90 via a new interchange with 4th Avenue S. and Edgar Martínez Drive S. (formerly S. Atlantic Street). The second stage of improvements has yet to be constructed. From there, Interstate 90 travels east through the Central Area and into tunnels under the Mount Baker neighborhood. The tunnels end at the western shore of Lake Washington and onto floating bridges to Mercer Island and under several lids (tunnels) onto the East Channel Bridge into Bellevue and Issaquah. Between Seattle and Bellevue, there are reversible express lanes in the middle of I-90, operating in the westbound direction during the morning commute and eastbound during the evening commute. I-90 then enters the Cascade Mountain range through Snoqualmie Pass and out towards the Columbia Plateau, where I-90 the crosses the Columbia River on the Vantage Bridge. The freeway then heads slight north to climb the Plateau and head east, passing through Moses Lake. At Ritzville, I-90 forms a concurrency with US 395 towards Spokane, where US 2 also forms a concurrency and both US 395 and US 2 branch off from I-90 and Downtown Spokane. I-90 continues to head east through the suburbs of Spokane and into Idaho.

[edit] Exit list

County	Location	Mile[4]	#	Destinations	Notes
King	Seattle	0.00		4th Avenue South (SR 519 north) – Seattle City Center, Amtrak, Ferries, Safeco Field, Qwest Field	Westbound exit and eastbound entrance
		0.32	2	I-5 – Everett, Vancouver, BC, Tacoma, Portland	Signed as exits 2A (south) and 2B (north) eastbound and 2B (south) and 2C (north) westbound
		1.39	3	Rainier Avenue	Signed as exits 3A (south) and 3B (north) westbound; no westbound entrance; former SR 900
		1.58		Express Lanes	Eastbound exit and westbound entrance
	Mercer Island	4.09	6	West Mercer Way	Eastbound exit and westbound entrance
		4.91	7A	77th Avenue Southeast	Eastbound exit and westbound entrance
		5.17	7B	Island Crest Way	Signed as exit 7 westbound
		6.38		Express Lanes	Westbound exit and eastbound entrance
		6.41	8	East Mercer Way
	Bellevue	7.19	9	Bellevue Way
		7.98	10A	I-405 – Bothell, Bellevue, Everett, Renton, Tacoma	Signed as exit 10 westbound
		8.23	10B	Richards Road – Factoria	Eastbound exit and westbound entrance
		9.09		142nd Place Southeast	HOV only
		9.60	11B	148th Avenue Southeast – Bellevue Community College	Westbound exit is via 156th Avenue
		9.60	11A	150th Avenue Southeast, 156th Avenue Southeast	Signed as exit 11 westbound
			11	161st Avenue Southeast	Eastbound exit is via 150th Avenue
		11.73	13	West Lake Sammamish Parkway, Lakemont Boulevard Southeast, Southeast Newport Way	Former SR 901
		13.89	15	SR 900 west (17th Avenue Northwest) – Renton
	Issaquah
		15.20	17	Front Street, East Lake Sammamish Parkway Southeast	Former SR 901
		16.13	18	East Sunset Way, Highlands Drive
		18.32	20	High Point Way
		20.59	22	Preston, Fall City
		23.72	25	SR 18 west / Snoqualmie Parkway – Auburn, Tacoma
		25.40	27	Snoqualmie, North Bend	Eastbound exit and westbound entrance
	North Bend	28.63	31	SR 202 west – North Bend, Snoqualmie
		30.95	32	436th Avenue Southeast
		33.06	34	468th Avenue Southeast
		36.14- 37.96	38	(no name)
		40.68	42	Tinkham Road
		43.91	45	USFS Road 9030
		46.09	47	Denny Creek, Asahel Curtis
		50.58	52	West Summit (SR 906 east)	Eastbound exit and westbound entrance
Kittitas		51.29	53	East Summit, Snoqualmie Pass Recreation Area
		53.03	54	Hyak, Gold Creek (SR 906 west)
		61.30	62	Stampede Pass, Lake Kachess
		62.31	63	Cabin Creek Road
		68.63	70	Sparks Road – Easton
		69.85	71	Easton
		72.34	74	West Nelson Siding Road
		76.35	78	Golf Course Road
		78.60	80	Roslyn, Salmon la Sac
	Cle Elum	81.41- 82.49	84	Cle Elum, South Cle Elum
		84.15	85	SR 903 north / SR 970 – Cle Elum, Wenatchee
		91.91	93	Elk Heights Road
		99.36	101	Thorp Highway – Thorp
		104.35	106	US 97 north – Ellensburg, Wenatchee	West end of US 97 overlap
	Ellensburg	107.65	109	I-90 Bus. (Canyon Road) – Ellensburg
		109.15	110	I-82 east / US 97 south – Yakima	East end of US 97 overlap
		113.76	115	Kittitas
		134.72	136	Huntzinger Road – Vantage
		135.72	Vantage Bridge over the Columbia River
Grant
		136.08	137	SR 26 east to SR 243 – Othello, Pullman, Richland
		142.14	143	Silica Road
		148.07	149	SR 281 north – Quincy, Wenatchee, George
		150.02	151	SR 283 north / SR 281 north (via SR 281 Spur) – Ephrata, Soap Lake, Quincy, Wenatchee
		152.90	154	Adams Road
		162.88	164	Dodson Road
		167.96	169	Hiawatha Road
	Moses Lake	172.89	174	Hansen Road – Mae Valley
		173.69	175	Westshore Drive – Mae Valley	Westbound exit only
		174.28	176	I-90 Bus. east / SR 171 north – Moses Lake
		177.74	179	SR 17 / I-90 Bus. west – Moses Lake, Ephrata, Othello
		181.12	182	O Road Northeast/Southeast – Wheeler
		183.18	184	Q Road Northeast/Southeast
		187.18	188	U Road Northeast/Southeast – Warden
Adams		195.20	196	Deal Road – Schrag
		205.13	206	SR 21 – Lind, Odessa
		213.52	215	Paha, Packard
		218.21- 218.49	220	US 395 – Ritzville, Pasco	West end of US 395 overlap
		219.67	221	SR 261 south – Ritzville, Washtucna
		224.14	226	Schoessler Road
		228.95	231	Tokio
Lincoln	Sprague	242.98	245	SR 23 – Sprague, Harrington
		251.74	254	Fishtrap
Spokane		255.41	257	SR 904 east – Tyler, Cheney
		262.02	264	SR 902 east – Cheney, Medical Lake
		268.27	270	SR 904 west – Four Lakes, Cheney
		270.53	272	SR 902 west – Medical Lake
		274.04	276	I-90 Bus. east – Spokane, Geiger Field
		275.45	277B	US 2 west – Spokane Airport, Fairchild AFB, Davenport	West end of US 2 overlap; signed as exit 277 westbound
		275.92	277A	Garden Springs	Signed as exit 277 westbound; no entrance ramps
	Spokane	277.06	279	US 195 south – Colfax, Pullman
		277.88	280A	Maple Street	Signed as exit 280 eastbound
			280B	Lincoln Street	Eastbound exit is via exit 280
		279.05	281	US 2 east / US 395 north (Division Street) – Newport, Colville	East end of US 2/US 395 overlap
		279.83	282A	SR 290 east (Trent Avenue) / Hamilton Street	Signed as exit 282 eastbound
		280.08	282B	Second Avenue	Westbound exit only
		280.74	283A	Altamont Street
		281.44	283B	Thor Street, Freya Street
		282.05		Havana Street	Eastbound entrance only
	Spokane Valley
		283.32	285	Sprague Avenue	No eastbound entrance
		283.95	286	Broadway Avenue
		285.54	287	Argonne Road
		287.56	289	SR 27 (Pines Road)
		288.74	291A	Evergreen Road – Spokane Valley Mall
		289.62	291B	Sullivan Road
		291.66	293	Barker Road
	Liberty Lake	292.63	294	Country Vista Drive, Appleway Avenue	Westbound exit and eastbound entrance
		293.89	296	Liberty Lake, Otis Orchards
		297.20	299	State Line, Idaho
		297.52	Idaho state line

[edit] Rest Areas and Weigh Stations

[edit] Rest Areas

The Washington State Department of Transportation (WSDOT) maintains 14 rest areas along I-90. The rest areas are located in nine localities. They are located mostly in pairs, located either directly across the highway from each other or within a few miles.

Rest Area list

County	Location Name	Mile[5]	Direction	Facilities	Misc
Kittitas	Snoqualmie Summit	53	Both		Access via SR 906
	Peace Creek	61	Eastbound
	Peace Creek	61	Westbound
	Indian John Hill	89	Eastbound
	Indian John Hill	89	Westbound
	Rye Grass	125	Eastbound
	Rye Grass	125.6	Westbound
Grant	Scenic Viewpoint	139	Eastbound
	Scenic Viewpoint	139	Westbound
	Winchester	161	Eastbound
	Winchester	161	Westbound
Grant	Schrag	198	Eastbound
	Schrag	198	Westbound
Lincoln	Sprague Lake	241	Eastbound
	Sprague Lake	242	Westbound
Spokane	State Line Welcome Center	299	Eastbound		I-90 enters Idaho

[edit] Weigh Stations

The Washington State Patrol (WSP) operates weigh stations (truck scales) in Washington. The WSP uses them to enforce commercial trucking laws. Several weigh stations are located on I-90.

[edit] References

Interstate 90
Previous state: Terminus	Washington	Next state: Idaho

v • d • e Interstates in Washington I-5    I-82    I-90    I-182    I-205    I-405    I-605    I-705 Proprosed highways shown in italics

	v • d • e 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