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

Southwest Idaho highway construction report for July 26-Aug. 2

BOISE - The following projects in southwest Idaho are now under way or will begin soon.

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

A 2.5-mile extension of Idaho 16 is under way, connecting Chinden Boulevard (U.S. 20/26) to State Street (Idaho 44), including construction of 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 is expected to finish by the fall of 2014.

Idaho 44 (State Street) traffic near the intersection with Idaho 16 shifted to temporary paving on the south shoulder July 8. Traffic will be reduced from three lanes to two as crews rebuild this section of Idaho 44 in preparation for realignment and extension of Idaho 16. 

Concrete guardrails will separate traffic from construction activities, and motorists are strongly encouraged to drive with caution. The speed limit is 45 mph.

For the portion of the project from Chinden to approximately 600 feet south of the Boise River, the new pavement base will be covered with a foot of concrete. Motorists will not be allowed to drive on it until the fall of 2014. Concrete paving will primarily take place at night. 

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 Const., of Boise and Nampa Paving are two of the main subcontractors for this work. The total construction cost is $38.94 million.

State Street/Linder Road/Ballantyne Lane intersection work

This work is part of the department’s Idaho 44 improvement project from Linder Road to Ballantyne Lane. Crews are rebuilding the Idaho 44/Linder Road intersection and widening Idaho 44 to five lanes. The work will improve safety, reduce congestion and allow for smoother traffic flow.

The east- and westbound lanes of Idaho 44 shifted to the north side of the highway June 27 as crews began rebuilding the south side. The traffic shift on Idaho 44 will be in place through September.
Crews started asphalt paving Wednesday and will finish with the bottom lift by the weekend.

On Thursday morning (July 25), crews began rebuilding the left-turn lane at the intersection of Idaho 44 and W. State Street. Throughout this closure, drivers are encouraged to access W. State Street from Eagle Road. The left-turn lane from Idaho 44 onto W. State Street will reopen by Sunday (July 28) at 7 p.m.

Central Paving, of Boise, is the contractor on this $9.23 million project.

U.S. 95 resurfacing Manns Creek to Alpine Store

Sections of U.S. 95 totaling 31.1 miles, from Manns Creek to Shoepeg Road and Cambridge to the Alpine Store, will be resurfaced in a project this summer to extend the life of the road and improve traction for drivers.

The resurfacing started June 17, from milepost 87.5 to 108.9, and from 113.7 to 123.4. The route travels through Washington and Adams counties. Work is expected to finish by late August.

The work is part overlay and part CRABS (Cement Recycled Asphalt Base Stabilization). CRABS is an in-depth resurfacing method. The existing roadway is pulverized down to the gravel base, cement is added to the pulverized material, and finally a new layer of asphalt pavement is placed on top.

Crews have pulverized the existing roadway, completed pavement milling and are performing CRABS operations from milepost 114 (Cambridge) to 123.4.

Pilot-car operations, reduced speed limits and width restrictions will continue through July 31. Paving began July 17 at Cambridge.

More than 6,000 feet of guardrail will be replaced to meet current standards. The project also will include some improvements to bridge decks and the current drainage systems at Monroe Creek (milepost 88.3) on the southern end of the project area and 18 miles farther north at Keithly Creek (milepost 106.5).

Knife River Corp. Northwest, of Boise, is the contractor on this $6 million project.

Idaho 21 resurfacing to Lowman

A resurfacing project covering 20.4 miles of Idaho 21 in Boise County that began in 2012 resumed July 15. The project is expected to finish in August.

Work this summer will add a Stress-Absorbing Fiberglass Layer with Emulsified Asphalt (SAFLEA) on two adjoining sections of Idaho 21 (milepost 52 to 60 and 60 to 73).

Crews will start work on Beaver Creek Summit and work toward Mores Creek Summit. Roadway surface temperatures are not expected to be hot enough until about 10 a.m. or 11 a.m. daily. The SAFLEA is expected to finish in 7-10 days.

The project runs from Mores Creek Summit to Clear Creek Bridge near Lowman. Crews completed paving and guardrail upgrades and stabilized slopes in the area last year before a winter shutdown.

A SAFLEA road treatment is a seal coat with a layer of glass fibers between the oil and the gravel aggregates to enhance durability and reduce cracking.

One lane of travel will remain open, with flaggers and pilot cars guiding traffic. Crews will work from 7 a.m. to 5 p.m. Mondays through Thursdays, and will work until noon on Fridays. No work is allowed on the weekends.

Knife River Corp, of Boise, is the contractor on this $3.9 million project.

GARDEN VALLEY - South Fork Payette River Bridge

Crews started work in mid-July to replace the old bridge over the south fork of the Payette River near Garden Valley. The work is expected to last until December 2013 or January 2014.

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.

ITD provided no input on the design phase of this project. Two open houses and a public hearing were held. Property owners, river-rafting companies and emergency responders were also contacted by phone and email.

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.

CALDWELL – I-84 Business Loop

A section of the I-84 Business Loop in Caldwell is being resurfaced. The project started June 17. Three segments will be impacted – Cleveland Boulevard, Centennial Way and Blaine Street. Work is expected to finish in August.

The project also will address 44 ramps to make them compliant with the Americans with Disabilities Act (ADA).

Crews are planning to work a 7 a.m. to 7 p.m. schedule Monday through Friday. Weekend work is not anticipated, but is not prohibited if necessary.

One lane of traffic will remain open during the work. Flaggers will be used on cross streets during milling and paving operations and to move equipment in and out of the work area. No pilot cars or temporary signals are expected.

Pavement markings were placed this week on Cleveland. Curb, gutter and ADA-ramp replacements are currently taking place. Repair of soft spots in the pavement is also in progress. One lane of Cleveland will be paved today (Friday, July 26).

C & A Paving Co., of Boise, is the contractor on this $1.2 million project. 

Murphy – Idaho 78, Scorpion Creek Bridge

A project to place a bridge over Scorpion Creek on Idaho 78 in Owyhee County continues. The south side of the bridge will be built first, then the north side.

The new concrete slab bridge will replace three corrugated-metal culverts that run under the roadway at milepost 23. One culvert is completely plugged. The other two culverts are more than halfway filled with sediment from the creek. Water runs over the highway at that location during periods of high water, creating a safety hazard.

The new bridge addresses a safety concern with water spilling over the roadway every time Scorpion Creek floods, which is nearly an annual event. The new bridge, about six miles northwest of Murphy, will accommodate higher water levels. The roadway elevation also will be raised about two feet. The roadway approaches will be reconstructed to match the new height and the wider bridge.

No night or weekend work is anticipated but is not prohibited, if necessary, to finish the project on time.
One lane of traffic will be maintained across the bridge during construction, controlled by a temporary traffic signal. Flaggers will be used when needed.

Backfill work is taking place behind the abutments this week, and bridge girders are expected to be placed sometime next week.

Knife River Corp. Northwest, of Boise, is the contractor on this $947,000 project.

FRUITLAND - SW 3rd Street; Iowa Avenue to Jct. U.S. 95   

This Local Highway Technical Assistance Council (LHTAC) project is a reconstruction of the main street through old downtown. The pavement is old and excessively patched, sidewalks are deficient and there are drainage issues.

Phase 2 construction is under way, and should conclude in early August. The job is on schedule to finish by early October.

The city of Fruitland is the local sponsor.

Irvco Asphalt & Gravel, of Fruitland, is the contractor on this $2.25 million project.

CASCADE – Bridge Replacement

Replacement of the North Fork Payette River Bridge in downtown Cascade continues. The bridgework will extend into late fall 2013.

This project will replace the old, narrow, width-restricted bridge built in 1933 with one more than twice as wide. The existing bridge is 24 feet wide, and will be replaced with a 60-foot wide, 393-foot long, three-span bridge. The new bridge will have two 12-foot lanes, two 11-foot shoulders and a 14-foot median.

In addition, a paved extension will be built to the dirt shared-use path under the bridge on the north side of the river that provides access from both sides of the bridge to the new riverside park. The short section under the west half of the new bridge has been graded, but has not yet been paved. 

In the first stage, two-thirds of the new bridge will be built to the west of the existing structure. Traffic will be maintained on the existing bridge through this first stage of bridge work, and then will be routed to the new section of bridge for the remaining work as the old bridge is demolished. There will be traffic interruptions while the new roadway section leading to the new bridge is built.

From Monday through Thursday, work that limits drivers to one lane in each direction is only allowed between 9 a.m. and 4 p.m. Two lanes will be maintained between noon Friday and noon Monday. A river safety and navigation plan will be in place for recreationists that use this section of the river.

The contractor finishing piling at Abutment 1 this week. Crews also placed concrete in Bent Cap 2 and Abutment 1. The contractor must now wait 10 days before placing bridge girders. Girders are currently scheduled for Aug 12.

In the meantime, work will proceed on forming the wing walls and striping the forms from the bridge deck.  

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

CASCADE - Lakeshore Drive reconstruction

This upcoming project involves reconstructing and widening 1,400 feet of roadway from old State Highway Road to Caddy Lane utilizing city-owned right of way, as well as replacing sewer and water system utilities and adding a sidewalk on the east side. The total project will cover the area from Dam Road to Duffers Lane, approximately 1.15 miles.

Public Lands Highway Discretionary Program and City of Cascade funds are being used to build this project.

The contractor has completed the gravity-sewer main and all services except for one inactive service behind an existing manhole. Crews have filled all old sewer main pipe with flowable fill, stripped all fill slopes and installed all of the four-inch water mains. They are currently working on installing the three services. This work included exploratory excavation to find the existing main and a pair of emergency repairs.

Granite Excavation, of Cascade, is the contractor on this $633,000 project. Work is expected to wrap up by September.

WEISER – replacement of bridge over Weiser River

The replacement of a 78-year-old bridge over the Weiser River south of Weiser has begun, with several significant traffic impacts. The work on U.S. 95 is expected to be done by the end of this year.

Traffic is restricted to one lane across the bridge. North- and southbound traffic will alternate across the bridge, controlled by temporary signals at both ends of the structure.

Drivers are reminded to use patience during reconstruction and perhaps consider an alternate route, such as Oregon State Route 201 and the U.S. 95 Spur.

Traffic volume increases on U.S. 95 on weekends, so electronic message boards, both on the side of the highway and overhead on westbound I-84, will be used to alert motorists of bridge restrictions. Crews plan to work Mondays through Fridays, but will be off the highway on weekends and holidays.

The two-lane bridge, one of 99 remaining on the state system built before 1936, will be replaced with a three-lane structure. The existing bridge has 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 also will reconstruct more than 500 feet of bridge approaches at the north and south ends.

The existing bridge has a sidewalk and two 13-foot lanes but no shoulders. The new bridge will have 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 will be included in the project.

The new bridge will be 346 feet long and 55 feet wide, including the parapet.

Traffic was switched July 8 from the old bridge to the new bridge, signaling that the project is about halfway done.  Crews are demolishing the remainder of the old bridge.

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

Sign repair/replacement

Nearly 150 highway signs along southwest Idaho roads will be repaired as ITD performs annual sign repairs for the next several months. ITD is responsible for providing safe roads for Idaho motorists, which includes ensuring clear and understandable information by providing proper signage on roadways.

The signs to be repaired are located on Interstate 84 from the Oregon Border to just east of Mountain Home (milepost 0-121), on the Connector, U.S. 20/26 in Boise and on the U.S. 95 Spur in Fruitland.

Work began June 3. Signs in Boise are done. Crews will move west, and then the project will return eastward.

Of the 149 sign locations to be upgraded, 73 sign locations are in need of total replacement of sign faces, posts and foundations. Another 76 will have new sign faces only.

Almost 26,000 square feet of signs will be repaired, with crews replacing damaged posts, replacing old sign bases with new break-safe sign bases, improving brackets and updating the reflectivity on sign panels where the paint has dulled.

Most of the work will be on the shoulder and will not require lane closures. All work that impacts traffic will be conducted overnight. No work will take place on the Connector during the evenings of home Boise State football games. Lane closures will be coordinated with special events if necessary.

This work will be done under a contract, as the sheer volume of sign repairs would overwhelm ITD’s five-man Sign Crew.  Most of the signs are the original ones and have begun fading with age.

The project is expected to finish by September.

Pavement Markings Northwest, of Boise, is the contractor on this $907,000 project.


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