Ada County Highway District

Phillippi Street, Malad Street to Targee Street

Construction Update September 10, 2021: Utility work ongoing. Malad to Targee complete. Targee & Overland - Landscaping remains. Punchlist items remain.

Construction Update September 3, 2021: Utility work ongoing. Malad to Targee - Complete. Targee & Overland - Signs and landscaping remain.

Construction Update August 26, 2021: Utility work is ongoing. Malad to Targee is complete. Targee and Overland - approaches remaining. Manhole collars, signs and stripes and landscape remain. 

Construction Update August 13, 2021: Utility work is ongoing. Malad to Targee is complete. Targee and Overland - the paving is complete. Approaches remain. Manhole collars, signs and stripes and landscaping remain. 

Construction Update July 30, 2021: Utility work is ongoing. Malad to Targee is complete. Targee and Overland - the paving is complete. Manhole collars, signs and stripes and landscape remain. 

Construction Update June 29, 2021: Utility work is ongoing. Landscaping is ongoing.

Construction Update June 1, 2021: Crews are preparing trench on Spaulding for paving. Asphalt removal is ongoing between Targee and Overland. 

Construction Update May 24, 2021: Utility work is ongoing. Paving is complete from Malad to Targee. Storm drainpipe from Targee to Overland is ongoing and anticipated to be complete May 27th, pending any additional conflicts. Sidewalk excavation and placement started between Targee and Overland on May 19th. 

Construction Update May 7, 2021: Crews will be placing sidewalk on Phillippi Street from Malad Street to Targee Street starting today and tomorrow (May 7 and 8). This work may temporarily restrict access to some adjoining homes.  

Starting the week of May 17th, crews will begin work on curb and sidewalk on Phillippi Street between Overland Road and Targee Street. 

Construction Update April 22, 2021: Excavation is ongoing. There is ongoing utility and irrigation work. 

Targee to Overland Update: Work on Spaulding started on Thursday, April 22nd. Crews will begin work to install storm drain pipe on Spaulding Street from Phillippi Street to Eagleson Road on Monday, April 19th. Spaulding Street will be closed but access to homes will be maintained. The work on Spaulding is expected to last 1 week. Storm drain pipe installation from Targee to Overland has begun. 

Past Updates: 

Roadway excavation started on March 15th.There was a preconstruction meeting on January 14th. Idaho Power began relocations on February 8th. 

Starting in early February, the Ada County Highway District will begin construction on the Phillippi Street Pedestrian Projects between Malad Street and Overland Road.  Tree removal and trimming started in advance of construction to allow for Idaho Power pole relocations. Construction is anticipated to be complete late summer 2021.

During construction neighbors can expect:

  • Phillippi Street to be closed to all but local traffic.
  • Temporary pedestrian detours.
  • General construction noise, dust, equipment back up alarms, and ground vibration.
  • Crews working 7 a.m. to 7 p.m. unless otherwise approved.

 Utility work started in January and will continue throughout the project.


Marathon Pipe Line and Safety

A petroleum pipeline, owned by Marathon Pipe Line (MPL), runs along both sides of Phillippi Street. As a result, ACHD has been working closely with MPL throughout the project development and has continued to do so to ensure that the highest safety standards are being maintained during construction. These safety standards include the Federal Pipeline Safety Standards adopted at 49 C.F.R. Part 195 and include regulations relating to design requirements, construction, pressure testing, operation, and maintenance (including maximum operating pressure, valve maintenance, pipeline repairs, pipe movement, over pressure safety devices, public awareness, damage prevention, and leak detection), qualification of pipeline personnel, and corrosion control. In addition, Idaho has established underground facility damage protection standards and requirements at Title 55, Chapter 22 to ensure any excavation is done safely and carefully, and with knowledge of the location of underground facilities such as the Marathon pipeline.

Additional steps being taken to ensure neighborhood safety:

  • When our contractor, Knife River, is working within 50 feet of the pipelines a MPL representative will be on-site.
  • An ACHD inspector will be on-site on a regular basis.
  • ACHD and Knife River have taken significant efforts to determine the pipeline location.
  • MPL authorized equipment will be used when compaction is required over the pipelines.
  • MPL monitors and controls the pipeline network 24 hours a day, 7 days a week. Pressure changes would trigger an immediate alarm at their operations center.
  • Both pipelines are outfitted with valves that can be shut down remotely.
  • MPL has an established Emergency Response Plan, which includes working with local emergency responders and maintaining the proper equipment to address different situations.


General Description:

  • Add curb, gutter and sidewalk to match existing.
  • Rebuild roadway.
  • Replace pedestrian ramps.
  • Utility work will start in January and will continue throughout the project

  • This project will be constructed with the Phillippi, Targee to Overland Project. 

Project Purpose

  • Improve connectivity and safety for pedestrians.

Project History

This project was first proposed in 2005, but proved to be unpopular with the public at the time (due to some now outdated right-of-way requirements) and was set aside. ACHD began updating the design in 2016 as it has been a long time request of the City of Boise.

Related Projects

2016 - 2017
Construction: 2021 - this project will be constructed with the Phillipi, Targee to Overland project. 

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