Current Projects

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Location: This project is located at the intersection of Lake Shore Dr. and Highway 45 on the south side of Nampa.

Description: Nampa Highway District is moving forward with improvements to this intersection, which is currently a two-way stop on Lake Shore Dr., while Highway 45 traffic continues through the intersection without stopping. The project will convert the intersection to a traffic signal to improve safety and traffic flow. Improvements will also include turn lanes at Deer Flat Rd. to help improve traffic movement through that intersection. Because Highway 45 is a state highway, Nampa Highway District is working closely with the Idaho Transportation Department (ITD) throughout the design and approval process.

Need for Project
This intersection has experienced a high number of crashes, making safety a primary concern. The planned improvements will provide a safer, more efficient intersection for motorists traveling along Lake Shore Dr. and Highway 45.

Nampa Highway District is currently working through the planning and design process, with construction to follow.

The process and schedule for the project are currently as follows:

Design – In-House Designer
Public Meeting – TBD
Concept Report – TBD
Preliminary Design – 2027
Purchase of Right-of-Way – 2027/2028
Final Design – 2028
Construction – 2028

News Releases and Newsletters

Graphics and Displays

Location
This project is located at the intersection of Happy Valley Rd. and Deer Flat Rd. on the south side of Nampa.

Description
The intersection is currently configured as an all-way stop. This project will reconfigure the intersection into a roundabout.

Need for Project
The existing all-way stop configuration can result in delays and reduced traffic flow through the intersection. Converting the intersection to a roundabout is expected to improve safety, traffic flow, and mobility along both the Happy Valley Rd. and Deer Flat Rd. corridors. The project will also provide consistency with the existing and planned roundabout corridor along Happy Valley Rd. and Deer Flat Rd.

The process and schedule for the project are currently as follows:

Design Consultant Selection – June 5, 2024 (DKS Associates)
Public Meeting – TBD
Concept Report – January 2025
Preliminary Design – Spring/Summer 2026
Purchase of Right-of-Way – 2027
Final Design – Fall 2027
Construction – Winter/Summer 2028 (six-month duration)

News Releases and Newsletters

Graphics and Displays

Location
This project is located at the intersection of Southside Blvd. and Kuna Rd. on the south side of Nampa.

Description
The intersection is currently a two-way stop-controlled configuration. East and west traffic on Kuna road is stopped controlled while the north and south traffic is free flow on Southside. The project will reconfigure the intersection into a roundabout.

Need for Project
This intersection is currently configured as a two-way stop-controlled. A roundabout in this location is expected to improve safety and mobility for both the Southside Blvd. and Kuna Rd. corridors. The project will fit the context of a roundabout corridor for Southside Blvd. This corridor currently has roundabouts planned at the intersections of Southside & Lewis, as well as Southside & Deer Flat.

The process and schedule for the project are currently as follows:
– Design Consultant Selection – October 2019 (Six Mile Engineering)
– Public Meeting – February 2, 2021
– Online Meeting Details:
https://www.zoom.us/join/
Meeting ID: 978 9076 9215
Passcode: 405157
– Concept Report – March 2021
– Preliminary Design – Summer 2021
– Purchase of Right-of-Way – 2028
– Final Design – Fall 2028
– Construction – Spring/Summer 2029 (six month duration)

News Releases and Newsletters
– 1-14-2021 Newsletter

Graphics and Displays
– Single-Lane Roundabout Alternative 1-07-2021
– Compact Single-Lane Roundabout Alternative 1-07-2021

Location
This project is located at the intersection of S. Powerline Rd. and Deer Flat Rd. on the south side of Nampa.

Description
The intersection is currently configured as a two-way stop, with northbound and southbound traffic on S. Powerline Rd. required to stop while eastbound and westbound traffic on Deer Flat Rd. is free-flowing. The project will reconfigure the intersection into a roundabout.

Need for Project
This intersection has experienced a high number of crashes, making safety a primary concern. Converting the intersection to a roundabout is expected to reduce the potential for serious crashes by reducing vehicle speeds and eliminating direct crossing and left-turn conflicts. The project will improve safety for motorists traveling along both the S. Powerline Rd. and Deer Flat Rd. corridors and will provide consistency with the existing and planned roundabout corridor along Deer Flat Rd.

The process and schedule for the project are currently as follows:

Design – In-House Designer
Public Meeting – TBD
Concept Report – TBD
Preliminary Design – 2028
Purchase of Right-of-Way – 2028/2029
Final Design – 2029
Construction – Winter/Summer 2030 (approximately six-month duration)

News Releases and Newsletters

Graphics and Displays

City of Nampa Construction Projects
https://www.cityofnampa.us/187/Construction-Projects

Roundabouts have become common in Canyon County during the past decade. Even though the public is now generally accustomed to them, some questions and concerns continue to persist; most of these are addressed in the videos and brochures discussed below.

Nampa Highway District is planning and designing several new roundabouts. Click on a Project location below for details about a specific roundabout project.

Educational Videos: Several educational videos are available regarding roundabouts. Two of them can be seen by clicking on the following links.

Roundabouts Overview (TxDot)

Further Reading. Please see the below articles for more information.

2016 Idaho Drivers Manual - Roundabouts

COMPASS Brochure - Roundabout Guide for Large Trucks & Oversize Vehicles

FHWA Brochure - Roundabouts, A Safer Choice

Description of Project Types

Seal coat is a film of oil sprayed on the road surface, with a layer of crushed gravel spread on top, and a thin “fog coat” of oil sprayed over the gravel. In some rare situations, it consists of just the “fog coat,” with no gravel. Any cracks in the pavement will receive a separate crack sealing treatment before the seal coat is applied.

While seal coats can be a nuisance, they significantly extend pavement life at relatively low cost by sealing out moisture and the sun’s ultraviolet rays. They also protect pavement from wear and provide necessary traction for vehicle handling.

Nampa Highway District seal coats on a seven-year cycle for main roads, and a ten-year cycle for subdivisions. Each year, the seal coats are programmed as funding allows, with roads of higher functional classification (such as Express Ways and Arterials) receiving higher priority.

An overlay is a layer of asphalt pavement, typically about 2” thick, which is placed over an existing road surface. Overlays are typically used when the existing road surface is excessively cracked, rutted, or otherwise distressed, but the underlying gravel base is still in good condition. Overlays are programmed based on several factors, such as pavement condition, functional classification, traffic volumes, and available funding.

Rebuild is the process of grinding the existing asphalt pavement and mixing it with the underlying gravel base, sometimes adding additional gravel, then paving a new asphalt pavement over the top. It is also sometimes called a full-depth rehabilitation. It is done when the existing road surface is excessively cracked, rutted, or otherwise distressed, and the underlying gravel base is also failing. Rebuilds are programmed based on several factors, such as road condition, functional classification, traffic volumes, and available funding.

As the name implies, new construction is the building of new roadway or changing the alignment of an existing roadway. New constructions are programmed based on an assessment of the benefit to the overall transportation network as well as available funding.

Roadway Projects

Description: The road will be pulverized, re-shaped and compacted, then resurfaced with new asphalt pavement.

Restriction: The first section of Deer Flat Rd., between Lynwood Rd. and Rim Rd., has been paved and is now OPEN to thru traffic! 🎉

The section of Deer Flat Rd. between Rim Rd. and Farner Rd. remains CLOSED while roadway reconstruction continues.

Tentative Rebuild Schedule: September – October 2026

Tentative Paving Schedule: September/October 2026

Description: This project will use a SALSA (Stress Absorbing Straight Layer of Asphalt) overlay to improve and extend the life of the existing roadway. The process begins with applying a layer of asphalt binder to the existing pavement, followed by a thin layer of stone chips that is embedded into the binder. A new layer of hot-mix asphalt is then placed over the treated surface, creating a smoother, more durable roadway. This treatment helps strengthen the roadway, seal and protect the existing pavement, and reduce the effects of cracking and other surface deterioration.

Restrictions: Temporary traffic restrictions may be in place as crews complete the SALSA overlay process, including roadway preparation, asphalt application, and paving operations. Motorists should expect possible delays and changing traffic patterns throughout the project. Homeowners and residents along the project area will be notified in advance of construction activities that may affect access to their properties. Local property access will be maintained, although short delays may occur while crews are working. Drivers should follow all posted signs, flagger instructions, and designated detour routes when applicable. Please use caution when traveling through the construction area and watch for construction personnel and equipment.

Tentative Rebuild Schedule: TBD

Tentative Paving Schedule: TBD

Tentative Rebuild Schedule: TBD

Tentative Paving Schedule: TBD

Tentative Rebuild Schedule: TBD

Tentative Paving Schedule: TBD

Tentative Rebuild Schedule: TBD

Tentative Paving Schedule: TBD

Description: This project will include a full-depth rehabilitation of the roadway. The existing pavement will be pulverized and incorporated into the roadway base, then the roadway will be re-shaped and compacted to provide a stable foundation. The roadway will then be resurfaced with new asphalt pavement, resulting in a smoother, more durable driving surface.

Restrictions: Through traffic will not be permitted within the active roadway reconstruction area. Motorists traveling through the project area should follow the designated detour routes. Local traffic and property access will be maintained throughout construction. Homeowners and residents along the project area will be able to access their homes, although short delays may occur due to active construction. Drivers should use caution, follow posted signs, and follow directions from construction personnel.

Tentative Rebuild Schedule: TBD

Tentative Paving Schedule: TBD

Tentative Rebuild Schedule: TBD

Tentative Paving Schedule: TBD

Tentative Rebuild Schedule: TBD

Tentative Paving Schedule: TBD

Tentative Rebuild Schedule: TBD

Tentative Paving Schedule: TBD

Description: This project will replace multiple culverts along Melba Rd., between Hwy-45 and Rim Road.

Restrictions: Melba Rd. will be subject to a full, hard closure during construction. Local residents will maintain access to their homes from at least one direction throughout the project. Detour information and additional project details will be provided as they become available.

Tentative Schedule: October 5th – Approximately October 15th