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Reed Hollinshead
ITD Office of Communication
(208) 334-8881

Southwest Idaho highway construction report for Dec. 13-20

BOISE - The following projects in southwest Idaho are now under way:

BOISE - Idaho 16 Extension, river crossing and local road connections (GARVEE)

Construction continues on the 2.5-mile extension of Idaho 16 connecting Chinden Boulevard (U.S. 20/26) to State Street (Idaho 44), including a 1,726-foot-long, 11-span, 10-pier, 88-foot-wide bridge over the Boise River and a new crossing of the Phyllis Canal. More than 1.5 million pounds of rebar and over 36.6 million pounds of concrete are used in the bridge.

Work began in May 2012 and is expected to finish by the fall of 2014.

Inclement weather pushed back the Idaho 44 traffic shift to Dec. 19 (it had been slated for Thursday, Dec. 12). Minor shifts of the traffic alignment near Idaho 16 this week will prepare for the opening of east- and westbound Idaho 44 traffic lanes.

Two lanes of traffic will be open for traffic traveling east or west, and there will continue to be turn lanes for northbound Idaho 16 traffic only.

Crews are working on the median concrete parapet on the bridge. They are also working on placing hydraulic mitigation rock south of the river.

GARVEE (Grant Anticipation Revenue Vehicle) bonds allowed the Idaho Transportation Department to advance critical infrastructure improvements in vital corridors throughout the state.

Concrete Placing Co., of Boise, and Idaho Sand & Gravel, of Nampa, are the prime contractors on these projects. Knife River Construction, of Boise, and Nampa Paving are two of the main subcontractors for this work. The total construction cost is $38.94 million.

GARDEN VALLEY - South Fork Payette River Bridge

Crews are working to replace the old bridge over the south fork of the Payette River near Garden Valley.
The old bridge, located southwest of town, also called the Alder Creek Bridge or Silver Bridge, has a sufficiency rating of less than 50. Boise County is the local sponsor. The new bridge will be relocated upstream and the existing bridge will serve as a detour during construction.

Work on the initial phase of the project will continue until the winter shutdown in early December.
Construction on the other half of the bridge will begin next spring, after crews remove the existing bridge. Work is expected to take most of summer 2014.

Ralph L. Wadsworth Construction Company Inc., of Draper, Utah, is the contractor on this $2.3 million project.

This is an LHTAC (Local Highway Technical Assistance Council) project. ITD has oversight responsibility for this work.

CASCADE – Bridge Replacement

Replacement of the North Fork Payette River Bridge in downtown Cascade is wrapping up for the winter. Work will be suspended through the winter and crews will return to plant willows in the spring.

Crews have nearly finished up installation of permanent signs, with milepost signs expected next week.  Also next week, the contractor will likely continue to work under the bridge to finish the underside of the deck. 

The old, narrow, width-restricted bridge was replaced with one more than twice as wide. The earlier bridge was 24 feet wide, and was replaced with a 60-foot wide, 393-foot long, three-span bridge. The new bridge has two 12-foot lanes, two 11-foot shoulders and a 14-foot median.

In addition, a paved extension to the dirt shared-use path under the bridge on the north side of the river was built to provide access from both sides of the bridge to the new riverside park.

Wadsworth Brothers Construction Co. Inc., of Draper, Utah, is the contractor on this $4.83 million project.

WEISER – replacement of bridge over Weiser River

The replacement of a 78-year-old bridge over the Weiser River on U.S. 95 south of Weiser is nearly complete. Crews need to install flashing beacons and paint stop bars on the surface.

The two-lane bridge has been replaced with a three-lane structure. The old bridge had 26 feet of drivable width, but the new one will be expanded to 48. An average of 7,300 vehicles use the bridge daily. More than 100 million vehicle trips have been taken across the bridge during its lifetime.

In addition to replacing the aging bridge, crews reconstructed more than 500 feet of bridge approaches at the north and south ends.

The old bridge had a sidewalk and two 13-foot lanes, but no shoulders. The new bridge is 346 feet long and 55 feet wide, with two 12-foot lanes and a 12-foot center turn lane. The project features a two-foot buffer next to the decorative bridge railing, a five-foot shoulder and a five-foot sidewalk on the west side. No bike lanes were included in the project.

Braun-Jensen, of Payette, is the prime contractor on the $4.8 million project.


Highway construction is one of the key forces pushing Idaho toward continued economic vitality by creating jobs, improving safety and reducing traffic congestion.