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
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
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.
Further Reading. Please see the below articles for more information.
2016 Idaho Drivers Manual - Roundabouts
COMPASS Brochure - Roundabout Guide for Large Trucks & Oversize Vehicles
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! 🎉
Tentative Rebuild Schedule: August 2026 – October 2026
Tentative Paving Schedule: September/October 2026
Description: This project will replace multiple culverts along McDermott Rd., between Kuna Rd. and W. Deer Flat Rd.
Restrictions: McDermott Rd. will be subject to a full, hard closure during construction. The closure is expected to last approximately four weeks. 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: Winter 2026 – Spring 2027
Please note: The project schedule is tentative and subject to change. Additional information will be provided as the project approaches.
Description: This project will replace multiple culverts along Southside Blvd., between McElroy Rd. and Melmont Rd.
Restrictions: Southside Blvd. will be subject to a full, hard closure during construction. The closure is expected to last approximately three weeks. 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: Winter 2026 – Spring 2027
Please note: The project schedule is tentative and subject to change. Additional information will be provided as the project approaches.
Description: This project will replace multiple culverts along Southside Blvd., between Melba Rd. and McElroy Rd.
Restrictions: Southside Blvd. will be subject to a full, hard closure during construction. The closure is expected to last approximately three weeks. 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: Winter 2026 – Spring 2027
Please note: The project schedule is tentative and subject to change. Additional information will be provided as the project approaches.
Description: This project will replace multiple culverts along Southside Blvd., between Melba Rd. and Stokes Ave.
Restrictions: Southside Blvd. will be subject to a full, hard closure during construction. The closure is expected to last approximately 1 Day. 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: Winter 2026 – Spring 2027
Please note: The project schedule is tentative and subject to change. Additional information will be provided as the project approaches.
Description: This project will replace multiple culverts along Bennett Rd., between Powerline Rd. and Hwy-45.
Restrictions: Bennett Rd. will be subject to a full, hard closure during construction. The closure is expected to last approximately two weeks or longer. 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: Fall 2026 – Spring 2027
Please note: The project schedule is tentative and subject to change. Additional information will be provided as the project approaches.
Description: This project will replace multiple culverts along Scism Rd., between Dearborne Rd. and Rim Rd.
Restrictions: Scism Rd. will be subject to a full, hard closure during construction. The closure is expected to last approximately two weeks. 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: Winter 2026 – Spring 2027
Please note: The project schedule is tentative and subject to change. Additional information will be provided as the project approaches.
Description: This project will replace multiple culverts along Scism Rd., between Lynwood Rd. and Dearborne Rd.
Restrictions: Scism Rd. will be subject to a full, hard closure during construction. The closure is expected to last approximately one week. 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: Winter 2026 – Spring 2027
Please note: The project schedule is tentative and subject to change. Additional information will be provided as the project approaches.
Description: This project will replace multiple culverts along Scism Rd., between Hwy-45 and Lynwood Rd.
Restrictions: Scism Rd. will be subject to a full, hard closure during construction. The closure is expected to last approximately one week. 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: Winter 2026 – Spring 2027
Please note: The project schedule is tentative and subject to change. Additional information will be provided as the project approaches.
Description: This project will replace multiple culverts along Rim Rd., between Deer Flat Rd. and Missouri Ave.
Restrictions: Rim Rd. will be subject to a full, hard closure during construction. The closure is expected to last approximately one week. 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: Fall 2026 – Spring 2027
Please note: The project schedule is tentative and subject to change. Additional information will be provided as the project approaches.
Description: This project will replace multiple culverts along Rim Rd., between Lewis Ln. and Deer Flat Rd.
Restrictions: Rim Rd. will be subject to a full, hard closure during construction. The closure is expected to last approximately three weeks. 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: Fall 2026 – Spring 2027
Please note: The project schedule is tentative and subject to change. Additional information will be provided as the project approaches.
Description: This project will replace multiple culverts along Rim Rd., between Lake Shore Dr. and Lewis Ln.
Restrictions: Rim Rd. will be subject to a full, hard closure during construction. The closure is expected to last approximately one week. 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: Fall 2026 – Spring 2027
Please note: The project schedule is tentative and subject to change. Additional information will be provided as the project approaches.
Description: This project will replace multiple culverts along McDermott Rd., between Kuna Rd. and Bennett Rd.
Restrictions: McDermott Rd. will be subject to a full, hard closure during construction. The closure is expected to last approximately two weeks. 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: Fall 2026 – Spring 2027
Please note: The project schedule is tentative and subject to change. Additional information will be provided as the project approaches.
Description: This project will replace multiple culverts along Emerald Rd., between Dearborne Rd. and Rim Road.
Restrictions: Emerald Rd. will be subject to a full, hard closure during construction. The closure is expected to last approximately two weeks or longer. 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: Fall 2026
Please note: The project schedule is tentative and subject to change. Additional information will be provided as the project approaches.
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: Fall 2026
Please note: The project schedule is tentative and subject to change. Additional information will be provided as the project approaches.
