This year Idaho Transportation Department will have four major projects in Ada County.
1 - INTERSTATE 84 GOWEN ROAD INTERCHANGE
Crews will widen Gowen to five lanes, replace the bridge over I-84, build new on- and off-ramps and improve turn lanes on Gowen, Federal Way and Eisenman Road. I-84 will be widened to three lanes in each direction between the Gowen and Broadway interchanges.
When: Construction begins next week and will be completed in late 2015.
Cost: $31 million.
History: The interchange was built in 1969. Since that time interchange traffic has increased from 5,650 to 44,500 vehicles per day.
2 - I-84 BROADWAY AVENUE INTERCHANGE
The project will install a central traffic signal for all turning traffic, similar to the new interchanges at Vista Avenue in Boise and Ten Mile Road in Meridian.
Other improvements include lengthening and widening the on- and off-ramps, widening I-84 to three lanes in each direction under the bridge, building two dedicated turn lanes for the eastbound on-ramp and adding new curbs, gutters and sidewalks.
When: Work began last week and will be completed in late 2015.
Cost: $53 million.
History: The interchange was built in 1969. Since then interchange traffic has increased from 8,850 to 70,000 vehicles per day.
3 - I-84 MERIDIAN ROAD INTERCHANGE
This work will build an interchange with a central traffic signal for all turning traffic, similar to the Vista Avenue and Ten Mile Road interchanges. The new interchange will widen the Meridian Road overpass to three lanes in each direction, widen the interstate to four lanes in each direction under the interchange, add dual-left turn lanes on Meridian for each I-84 on-ramp, and add sidewalks and bicycle lanes on Meridian.
When: Construction will start in early April and be completed in late 2015.
Cost: $40 million.
History: The interchange was built in 1965. Traffic has increased from 15,000 to 128,000 vehicles per day.
4 - IDAHO 16
This project will create a new 2.2-mile road, including a new Boise River bridge, to extend Idaho 16 from Idaho 44/State Street to U.S. 20/Chinden Boulevard near McDermott Road.
When: Construction began in 2012 and should be completed in September.
Cost: $112 million.
History: The project will provide another vital north-south link in the Treasure Valley. The new bridge over the Boise River the first new crossing in the area in 20 years is expected to serve 22,000 drivers a day once it opens. ITD does not have funding to connect Idaho 16 from Chinden to I-84.
Cynthia Sewell: 377-6428, Twitter: @CynthiaSewell