Interstate 405 Washington

A short cut and cover tunnel is located on southbound Interstate 405 immediately prior to the Interstate 90 interchange. The tunnel only covers the southbound lanes, and vegetation grows on top of the tunnel. Photo taken 08/31/06.

Routing

Interstate 405 provides a bypass to the east of Seattle, connecting with several major suburbs on the east shore of Lake Washington. The freeway is the most direct route to Redmond, home of Microsoft, via the Washington 520 freeway. As a result of growth in the greater Seattle area, Interstate 405 carries significant traffic volume, almost on a level like its sibling in California, albeit with fewer lanes. To alleviate some of this congestion, a second north-south freeway is being considered for the eastern suburbs of Seattle, dubbed as Interstate 605 by some. It remains unclear if this new highway will be constructed.

High Priority Corridor

Interstate 405 is part of High Priority Corridor 35: FAST Corridor.

History

Interstate 405 began as Washington 405 with its first segment running between Renton and Tukwilla. Its first portion opened in September 1965, Washington 405 was redesignated Interstate 405 with its completion by 1971.1

Highway Guides

Southern Terminus - Interstate 5 - Tukwila, Washington
Perspective from Interstate 405 south
Interstate 405 south comes to an end at this junction with Interstate 5 and Washington 518. The left lanes transition directly onto Washington 518, while the right lanes exit onto northbound Interstate 5 toward downtown Seattle. Photo taken by Chris Elbert (03/03/06).
The last ramp along southbound Interstate 405 is the connection to Interstate 5 south. Unlike the north end of Interstate 405, there are no end shields present here. Washington 518 west begins at this point for the remainder of the freeway route to SeaTac and Burien. Photo taken 08/30/06.
Perspective from Washington 518 west
This set of older signs is posted immediately after the Interstate 5/Interstate 405 interchange. Washington 518 continues west past the Washington 99 interchange, then ends at Washington 509 freeway in Burien. Photo taken 08/30/06.
Two interchanges exist along Washington 518 between Interstate 5 and Washington 509: Washington 99/Sea-Tac International Airport and Des Moines Memorial Drive. Photo taken 08/30/06.
The ramp to Washington 99 and Sea-Tac International Airport splits, with the two through lanes on the exit ramp connecting to the airport site. Photo taken 08/30/06.
After the Sea-Tac Airport and Washington 99 interchange, the next exit is for Des Moines Memorial Drive. Photo taken 08/30/06.
Entering Burien, a Freeway Ends sign is posted for westbound Washington 518 after the Des Moines Memorial Drive interchange. Photo taken 08/29/06.
Washington 518 west comes to its end as it reaches the diamond interchange with Washington 509. All traffic is controlled by a traffic signal on Washington 518. The first connection is to Washington 509 north to Seattle; the second connection is to Washington 509 south to Des Moines (left turn). Photo taken 08/29/06.
An older, button-copy sign is posted for the second traffic signal. Turn left to follow Washington 509 south to Des Moines. Continue straight ahead onto SW 148th Street to 1st Avenue South in Burien. Photo taken 08/29/06.
A wall of traffic signals is posted at the ramp to southbound Washington 509. Washington 518 comes to its end here. Photo taken 08/29/06.
Perspective from Washington 518 east
Now traveling east on Washington 518, this set of signs is posted after the Washington 509 interchange in SeaTac. The bridges above are for airport lighting for the runway trajectory. The next exit connects eastbound Washington 518 to Washington 99 via South 154th Street, followed by the exits to Sea-Tac International Airport, Southcenter Mall, and Interstate 5 and Interstate 405. Photo taken 08/29/06.
Eastbound Washington 518 reaches the exit for South 154th Street to Washington 99. The next exit is the airport connector. Photo taken 08/29/06.
Next, Washington 518 reaches the off-ramp for the airport connector. Another set of Interstate 5 and Interstate 405 shields are posted on the overhead. Photo taken 08/29/06.
Traffic on Washington 518 dramatically increases after the airport interchange. Next up is the exit to Southcenter Mall, followed by connections to Interstate 5 north to Seattle and south to Tacoma and Olympia. Photo taken 08/29/06.
A button copy exit sign is in use for the Southcenter Mall (51st Avenue South) exit. The next exits are for Interstate 5 south and north. Photo taken 08/29/06.
The left lane exits onto northbound Interstate 5 to Seattle. Both main lanes continue east onto northbound Interstate 405 to Renton. The right lane exits onto southbound Interstate 5 to Tacoma. Photo taken 08/29/06.
After traffic connecting to Interstate 5 departs, the two lanes of Washington 518 shift directly onto northbound Interstate 405. Photo taken 08/29/06.
Perspective from Interstate 405 north
The first exit on northbound Interstate 405 is Exit 1, Washington 181 (West Valley Highway) south to Tukwila. Photo taken 08/29/06.
The first reassurance shield for Interstate 405 north is posted after the Interstate 5 interchange but prior to the Washington 181 interchange (Exit 1). Photo taken 08/29/06.
Perspective from Interstate 5 north
After the off-ramp to Exit 152 (South 188th Street/Orillia Road South), northbound Interstate 5 next approaches Exit 153, Southcenter; Exit 154A, Washington 518 west to Washington 509 (Sea-Tac International Airport and Burien), and Exit 154B, Interstate 405 north to Renton. Photo taken 08/29/06.
A second set of overheads is posted shortly thereafter. The right lane becomes exit only for both Exit 153, Southcenter and Exit 154B, Interstate 405 north to Renton. The number three lane connects to Washington 518 west to the airport and Burien. A variable message sign is located on the same sign bridge. Photo taken 08/29/06.
Northbound Interstate 5 reaches Exit 153, Southcenter. The next interchange is Exits 154A-B, Washington 518 west to Burien and Sea-Tac International Airport and Interstate 405 north to Renton. Interstate 405 bypasses downtown Seattle to the east of the city center, but its narrow roadway limits its capacity. Daily traffic jams on Interstate 405 are common. Photo taken 08/29/06.
Passing under the Southcenter Parkway overpass in Tukwila, the right two lanes immediately transition onto northbound Interstate 405 and westbound Washington 518. A carpool/high occupancy vehicle lane forms on the left to allow those vehicles to bypass the interchange. Three main lanes carry Interstate 5 through this interchange. Photo taken 08/29/06.
Now on the transition ramp, the right lane connects to northbound Interstate 405, while the left lane connects to Washington 518 west to Sea-Tac International Airport, Burien, and the Washington 509 freeway. Photo taken 08/29/06.
A small gore point sign advises of the split between Washington 518 and Interstate 405 on the transition ramp from northbound Interstate 5. Photo taken 08/29/06.
Perspective from Interstate 5 south
Now looking at Interstate 5 south, the first appearance of a sign related to Interstate 405 is the high occupancy vehicle sign advising motorists connecting to Sea-Tac International Airport to merge right and exit onto Washington 518 west. Photo taken 08/30/06.
A second warning sign advises that airport traffic should leave the carpool lane and merge right for the exit to Washington 518 west. Photo taken 08/30/06.
The first appearance of Interstate 405 south is found after Exit 156, Interurban Avenue. The next exit is Exits 154B-A, Washington 518 west to the airport and Interstate 405 north to Renton and Bellevue. Photo taken 08/30/06.
Washington 518 is a short freeway connector between Interstate 5 and Interstate 405 in Tukwila and Washington 509 in Burien. The freeway has a direct connection to Sea-Tac International Airport. Photo taken 08/30/06.
This set of signs, found immediately after traffic from Washington 599 south merges onto Interstate 5 south, advises of the pending interchange with Interstate 405 north and Washington 518 west. Note the left exit to northbound Interstate 405 (Exit 154A). Photo taken 08/30/06.
The right two lanes exit first to Exit 154B, Washington 518 west to Southcenter Mall, Washington 99, Sea-Tac International Airport, Washington 509, and Burien. The next exit connects to Interstate 405 north to Renton (Exit 154A). Photo taken 08/30/06.
After the Interstate 5 south high occupancy vehicle bypass lane separates from the Interstate 405 north high occupancy vehicle lane, the left lane prepares to exit onto Interstate 405 north. This interchange marks the southern terminus of Interstate 405 as well as the eastern terminus of Washington 518. Photo taken 08/30/06.
Perspective from Washington 509 south
An Interstate 405 sign appears on southbound Washington 509 at its junction with Washington 518. Use Washington 518 east to Interstate 5, Interstate 405, and Seattle-Tacoma International Airport. Photo taken by Chris Elbert (03/03/06).
Perspective from Washington 509 north
Interstate 405 and Interstate 5 are both signed on northbound Washington 509 as the freeway approaches the junction with Washington 518 east. Photo taken 08/29/06.
A roadside sign advises that this exit is for Washington 518 east to Sea-Tac International Airport and SW 148th Street west into Burien. Photo taken 08/29/06.
Passing under S. 152nd Street, northbound Washington 509 meets Washington 518 east at this off ramp, which is signed for Interstate 5 and Interstate 405. Photo taken 08/29/06.
Now on the transition ramp, a traffic signal governs the flow. Turn right to follow Washington 518 east to Interstate 5 and Interstate 405. Turn left to follow SW 148th Street west into Burien. Photo taken 08/29/06.
Perspective from Seattle-Tacoma International Airport Access Road north
Departing Seattle-Tacoma International Airport, this sign and shield assembly appears on the approach to the junction with east-west Washington 518. Use the right lanes to Seattle and Tacoma. This interchange is located just west of the Interstate 5 and Interstate 405 interchange in Tukwila. Use Interstate 405 north to Interstate 90 east. Photo taken by Jeff Royston (02/24/06).
Perspective from Washington 599 south
Looking at southbound Washington 599 -- the short freeway connector between Washington 99 and Interstate 5 -- the left lane offers a connection to the high occupancy lanes of Interstate 5 south and Interstate 405 north. The number two lane connects to northbound Interstate 405, and the right two lanes connect to southbound Interstate 5. Photo taken 08/30/06.
Northern Terminus - Interstate 5 - Alderwood Manor
Perspective from Interstate 405 north
The final reassurance shield assembly on northbound Interstate 405 is posted after Exit 26, Washington 527 to Bothell and Mill Creek. Photo taken 08/29/06.
A few miles after the Washington 527 interchange, northbound Interstate 405 approaches its junction with Interstate 5. The left two lanes (inclusive of the former carpool/high occupancy vehicle lane) transition directly onto the Washington 525 freeway spur, which travels northwest toward Washington 99 and downgrades to a regular highway en route to Mukilteo. Note the northbound control city of Vancouver, B.C. and southbound control city of Seattle and destination city of Lynwood. Photo taken 08/29/06.
The right lane becomes exit only for the connection to northbound Interstate 5 to Everett and Vancouver, B.C. The interchange is visible in the distance. Photo taken 08/29/06.
Continuing northwest, Interstate 405 reaches the ramp for Interstate 5 north to Everett and Vancouver, B.C. (two-lane exit). The remaining right lane will connect (exit only) to southbound Interstate 5. The left two lanes continue north onto Washington 525. Photo taken 08/29/06.
The right lane becomes exit only for the connection to southbound Interstate 5 to Lynwood and Seattle. The left two lanes continue onto northbound Washington 525. Photo taken 08/29/06.
An end shield is posted for Interstate 405 along with a begin Washington 525 shield. Photo taken 08/29/06.
Reaching the transition ramp from northbound Interstate 405 to southbound Interstate 5, the left lanes continue onto northbound Washington 525 toward Mukilteo. Photo taken 08/29/06.
Perspective from Washington 525 north
Immediately upon crossing over Interstate 5, northbound Washington 525 approaches its first exit: Alderwood Mall Parkway. Photo taken 08/29/06.
A new lane joins northbound Washington 525 and forms the off-ramp to Alderwood Mall Parkway. A pull-through sign advises that Washington 525 continues north to Washington 99 and Mukilteo. Photo taken 08/29/06.
Northbound Washington 525 reaches the off-ramp for Alderwood Mall Parkway. Photo taken 08/29/06.
After the Alderwood Mall Parkway interchange, a Washington 525 north reassurance shield and pull-through sign are posted. Photo taken 08/29/06.
The short Washington 525 freeway ends at its junction with Washington 99. Use Washington 99 north to Everett and south to Lynwood. Through traffic for Washington 525 to Mukilteo should use the left two lanes. Photo taken 08/29/06.
A freeway ends one-half mile advisory sign is posted as Washington 525 passes under 148th Street SW. The next exit is Washington 99 north, followed by Washington 99 south. Photo taken 08/29/06.
Northbound Washington 525 reaches the transition ramp to northbound Washington 99. The next exit is the connection to Washington 99 south. Photo taken 08/29/06.
The connection to southbound Washington 99 is via a right turn at a traffic signal; the freeway ends at this point. Washington 525 continues north as a surface street to Mukilteo. Photo taken 08/29/06.
Perspective from Washington 99 south
Now traveling south on Washington 99 at the interchange with Washington 525, both Interstate 5 and Interstate 405 are mentioned on the guide sign. The control of Alderwood Mall Parkway refers to the sole exit ramp between Washington 99 and Interstate 5 along southbound Washington 525. Photo taken 08/29/06.
Perspective from Washington 525 south
Looking south on Washington 525, the first appearance of the junction with Interstate 5 and Interstate 405 is this roadside sign located a short distance southeast of the Washington 99 interchange. Note that there is no direct connection to northbound Interstate 5. Photo taken 08/29/06.
The only interchange on Washington 525 between Washington 99 and the junction with Interstate 5 and Interstate 405 is the connection to Alderwood Mall Parkway. Photo taken 08/29/06.
Southbound Washington 525 reaches the off-ramp for Alderwood Mall Parkway. The interchange with Interstate 5 and Interstate 405 lies around the corner in the distance. Photo taken 08/29/06.
The next exit is the connection from southbound Washington 525 to southbound Interstate 5 en route to downtown Seattle. Photo taken 08/29/06.
As traffic merges onto southbound Washington 525 from Alderwood Mall Parkway, a new right lane is formed to transfer traffic onto southbound Interstate 5. Photo taken 08/29/06.
Southbound Washington 525 splits, with the left two lanes connecting onto southbound Interstate 405 and the right two lanes exiting onto southbound Interstate 5. This marks the southern terminus of the state route. Photo taken 08/29/06.
Perspective from Interstate 405 south
As the freeway passes over Interstate 5, a shield assembly announces end Washington 525 and begin Interstate 405. Photo taken 08/29/06.
Perspective from Interstate 5 south
Now traveling south on Interstate 5, the first appearance of Interstate 405 is on this overhead sign, prior to Exit 183 (164th Street SW) and about two miles north of the Interstate 405 junction. Photo taken 08/30/06.
Southbound Interstate 5 reaches Exit 183 (164th Street SW); the next exit is Exit 182, Interstate 405 south to Bellevue and Renton. Photo taken 08/30/06.
The right two lanes will connect to southbound Interstate 405, which ostensibly provides a bypass of Seattle but instead offers a route to Seattle's eastern suburbs. These suburbs have grown tremendously, and Interstate 405 carries a heavy burden created by the additional traffic. Photo taken 08/30/06.
Southbound Interstate 5 reaches Exit 182, Interstate 405 south to Bellevue and Renton. There is no access to Washington 525 north. Photo taken 08/30/06.
Passing under the Maple Street overpass, a pull-through sign advises of Interstate 5 south to Seattle and the pending junction with Washington 524 (196th Street SW) to Lynwood (Exit 181). The bridge carrying Interstate 405 over Interstate 5 is visible in the distance ahead. Photo taken 08/30/06.
Perspective from Interstate 5 north
As northbound Interstate 5 meets 44th Avenue West to Washington 524 in Lynwood (Exit 181A), overhead signs advise of the pending interchange with Interstate 405 south and Washington 525 north (Exit 182). Photo taken 08/30/06.
After Exit 181B (Washington 524/196th Street SW and Alderwood Mall Parkway), northbound Interstate 5 approaches Exit 182, Interstate 405 south and Washington 525 north. Photo taken 08/30/06.
Northbound Interstate 5 reaches Exit 182, Interstate 405 south to Bellevue and Renton and Washington 525 north to Washington 99 and Mukilteo. Photo taken 08/30/06.

Sources:

  1. Interstate 405 (Washington) @ Wikipedia.org.

Page Updated September 26, 2006.



Popular Pages

More Info

Mileage

State Washington
Mileage 30.30
Cities Renton, Bellevue, Seattle
Junctions I-5, I-90, I-5
Source: December 31, 2016 Interstate Route Log and Finders List
I-405 Washington Annual Average Daily Traffic

State Location AADT Composite Year
Washington Renton 137,000 2002
Washington Bellevue 201,000 2002
Washington Bothell 114,000 2002
Source: 2002 Annual Traffic Report (WSDOT)
Complete Interstate 405 AADT data.