Welcome to the official website of
Highway District No. 4

Our Purpose and Organization

Highway District No. 4 (CHD4) is one of four Highway Districts in Canyon County.  Our Highway District boundaries primarily include the Northeastern area of Canyon County, surrounding Caldwell and Middleton.  Highway District No. 4 was formed in 1981 to maintain public rights-of-way, roads, and bridges in the highway system, within the District's boundaries, excluding state highways and public streets within city limits.

The Highway District is a political subdivision of the State of Idaho and, according to state law, functions like a corporation. It is a special-purpose district and is not part of the state, city or county governments.

Total Miles in District:

Improved Miles:

Gravel Miles:

Latest News & Information

See Recent Updates to Our Permits and Development Pages

Effective August 22, 2022

HD4 began collecting development impact fees for the Mid-Star Service Area with all access permits issued for new residential, commercial, or industrial development.  This includes the unincorporated areas around Middleton and Star lying north of the Boise River, and a small area north of Lincoln Road within one mile from Middleton Road. 

See our Transportation Impact Fee webpage for more information.

HD4 Employment Opportunities

Highway District No. 4 (HD4) is seeking qualified applicants to complement the Road Crew and  Engineering Department in planning, design, and construction of transportation projects, and assist with management of development entitlements and infrastructure.

For immediate consideration, submit an application, resume, and any supplementary materials to [email protected] (include “HD4 Job” in the subject line), or by US mail.

HD4 offers an outstanding benefits package to all employees:                                                                                                      CHD4 Employee Benefits Summary Aug 2021

Current Job Openings:

Job Application (Required for all positions)

Truck Driver

Duties include operating trucks used in road, pipe, and bridge maintenance. Have knowledge of snow removal equipment. Work with road, bridge, and herbicide crews or as assigned. Requires a Class A CDL.

Salary Range:  $22.39 - $26.11 /hr

Herbicide Applicator/Equipment Operator 

Duties include operating spray equipment and machinery in the application of various herbicides on public road sites, ensure the safe application of all weed control measures, and operate various types of construction equipment, trucks, or other duties as assigned.

Salary Range: $24.18 - $28.20

Senior Assistant District Engineer

B.S. in Civil Engineering or related engineering discipline with 7+ years experience. P.E. certification required.

Primary Duties:  Planning, design and construction oversight of capital projects; leads development and maintenance of long- and mid-range transportation plans; and administration of impact fee programs.

Salary Range:  $40.49 - $59.50 /hr

Current and
Recent Projects

Current and
Recent Projects



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