Who built SR 99 tunnel?

The design team includes HNTB Corporation, Intecsa of Spain, Hart Crowser, Inc., and EMI Inc. HNTB was responsible for the design of the lining and approach structures. After close to two years of design and preparations, TBM Bertha was launched and began drilling in July 2013.

How much did the Alaskan Way Viaduct cost?

The cost of rebuilding the viaduct was estimated at $2.7 billion to $3.1 billion, and construction would take eight years. Supporters of a tunnel argued it would reduce noise pollution, reconnect downtown to the waterfront and open views of Elliott Bay — but it was the most expensive option.

How much did the tunnel in Seattle cost?

The project is estimated to cost US$3.29 billion, with $2.8 billion coming from the state and federal governments to cover the tunnel boring and a new interchange in SoDo.

What is the Alaskan Way Viaduct?

The Alaskan Way Viaduct is an elevated section of State Highway SR 99, one of two major North-South corridors in the City of Seattle. The viaduct runs above Alaskan Way along the Elliott Bay waterfront, from the Belltown Battery Tunnel in the north to South Nevada Street in the south.

How much does the 99 tunnel cost?

Weekday toll rates (Monday through Friday)

Monday through Friday	Good To Go! Pass	Pay By Mail
Monday through Friday 3 p.m. to 6 p.m.	Good To Go! Pass $2.60	Pay By Mail $4.60
Monday through Friday 6 p.m. to 11 p.m.	Good To Go! Pass $1.45	Pay By Mail $3.45

When did the 99 tunnel open?

February 4, 2019
State Route 99 tunnel/Opened
At 12:17 a.m. on Monday, February 4, 2019, the State Route 99 tunnel replacing the Alaskan Way Viaduct opens to traffic. The 1.7-mile route under downtown Seattle is North America’s largest bored tunnel, stretching from the South Lake Union neighborhood at its north portal to the Sodo neighborhood at its south end.

Why was the Alaskan Way Viaduct built?

The Alaskan Way Viaduct was originally built to carry a section of U.S. Route 99, the main north–south highway in Washington and along the U.S. West Coast. The highway previously used downtown streets, but rising automobile congestion in the 1920s sparked proposals for a limited-access bypass of Seattle.

Who built Seattle tunnel?

The project started and finished in downtown Seattle, tunneling under 157 buildings along the way. In the beginning, engineers focused on protecting structures, and after the work reached deeper soil conditions, contractor Seattle Tunnel Partners—a joint venture between Dragados USA and Tutor Perini Corp.

When did the viaduct close?

January 11, 2019
The viaduct was closed permanently on January 11, 2019, and the new tunnel opened three weeks later on February 4. Demolition of the viaduct began weeks later, and was complete by late 2019.

How much is the 520 toll?

SR 520 Bridge Toll Rates effective July 1, 2017

Mondays through Fridays	Good To Go! Pass 1	Pay By Mail 1
11 a.m. to 6 p.m.	$2.65	$4.65
6 p.m. to 9 p.m.	$2.05	$4.05
9 p.m. to 11 p.m.	$1.40	$3.40
11 p.m. to 11:59 p.m.	$1.25	$3.25

What is the difference between a viaduct and a bridge?

A viaduct is a specific type of bridge that consists of a series of arches, piers or columns supporting a long elevated railway or road. Typically a viaduct connects two points of roughly equal elevation, allowing direct overpass across a wide valley, road, river, or other low-lying terrain features and obstacles.