ITD Projects Southwest Idaho Intersection Karcher and Middleton roads, Nampa

Intersection Karcher and Middleton roads, Nampa

Project Facts
Key number: 12046

Project Background

Approximately 30,000 cars pass through the intersection of Karcher Road (Idaho Hwy 55) and Middleton Road each day. This intersection is one of the most crash-prone sites in Idaho and rapid development has resulted in greater traffic congestion.

Currently, both Karcher Road and Middleton Road are two-lane rural roadways at the intersection area and there are no bicycle lanes or continuous sidewalks within the project limits.

ITD and the City of Nampa are partnering to rebuild this intersection to improve safety and reduce congestion.

Project Description

The project will rebuild the existing Karcher Road and Middleton Road intersection. On Karcher Road improvements will be made from just west of Elijah Drain to the vicinity of Sundance Street. On Middleton Road improvements will be made from Aries Drive to the vicinity of Hailey Avenue.

Improvements will include adding more lanes, sidewalks, curb, gutter and a new traffic signal.

Design Activities

Ten proposed alternatives were initially discussed for this project. Four alternatives were carried forward for further evaluation and presented to the public for review and comment in August 2012. ITD has been working to finalize design plans for the project, and in early 2014 the planned improvements were presented at a public open house and online public meeting.

The planned improvements call for widening Karcher Road and Middleton Road by adding turn lanes, upgrading the existing signal and adding pedestrian crossing and drainage.


Construction will begin in spring 2015 and is expected to be complete by late 2015. As of now, ITD and Nampa anticipate that during construction:

  1. One lane will be open in each direction.
  2. Work will be done mostly during the day.
  3. Access to businesses and residences will remain open throughout construction.
  4. The speed limit in the construction zone will be reduced to 35 miles per hour.

Jennifer Gonzalez, ITD, Public Information Specialist
(208) 334-8938

Compliance with Title VI of the Civil Rights Act
The Idaho Transportation Department (ITD) is committed to compliance with Title VI of the Civil Rights Act of 1964 and all related regulations and directives. ITD assures that no person shall on the grounds of race, color, national origin, gender, age, or disability be excluded from participation in, be denied the benefits of, or be otherwise subjected to discrimination under any ITD service, program, or activity. The department also assures that every effort will be made to prevent discrimination through the impacts of its programs, policies, and activities on minority and low-income populations. In addition, the department will take reasonable steps to provide meaningful access to services for persons with Limited English Proficiency.

More Information

Planning Improvements

Feb. 13 2014 Open House
  1. Invitation
  2. Open House Displays
  3. Summary of Open House/Online Meeting
  4. Q & A's
Aug. 9 Public Meeting.
  1. Invitation
  2. Public meeting materials
  3. Open House/Online Meeting Summary