Boise has received $5.6 million in federal transportation funding to advance planning for a major east-west road extension south of the airport, a project aimed at improving regional connectivity and supporting industrial development. The Department of Transportation awarded the grant on July 9, 2026, through the BUILD (Better Utilizing Investments to Leverage Development) program, which distributed $1.73 billion across 127 projects nationwide.
The Lake Hazel Road extension represents a significant infrastructure initiative for Ada County, designed to connect southwest Boise residents to job centers while opening new corridors for commercial and industrial expansion in the region. The planning phase will include environmental screening, analysis of potential railroad crossings, and development of a phased implementation strategy to move the project toward construction readiness.
Funding Supports Regional Growth Strategy
Mayor Lauren McLean described the award as a milestone for the city and the broader Treasure Valley. “This funding provides an incredible step forward for our community and region,” she said. “Once completed, the Lake Hazel extension will connect southwest Boiseans to future jobs and provide a critical roadway for industrial expansion.”
The project gained support from the Ada County Highway District (ACHD) and community partners throughout the grant application process. Idaho’s congressional delegation also backed Boise’s pursuit of the federal dollars, reflecting the extension’s importance to state growth and economic development priorities.
Planning Phase to Set Foundation for Construction
Rather than funding direct construction, the $5.6 million will finance the comprehensive planning work necessary to bring the project to “shovel-ready” status. This includes environmental assessments required under federal and state law, detailed study of how the roadway will interface with existing railroad infrastructure in the area, and creation of a phased buildout plan that balances community needs with fiscal constraints.
Such planning investments are common for major infrastructure projects, allowing communities to conduct thorough engineering and environmental reviews before committing to construction contracts. The approach reduces risk of costly design errors and helps projects qualify for additional funding sources as construction phases move forward.
Impact on Ada County Development
Southwest Boise has experienced rapid residential growth over the past decade, with new subdivisions and mixed-use developments expanding toward the Boise Airport and beyond. A completed Lake Hazel extension would provide an alternative route for commuters, potentially easing traffic on existing roads while creating access to undeveloped land suitable for industrial and commercial uses.
The project aligns with broader Ada County infrastructure priorities, similar to ongoing efforts by regional partners to improve connectivity. Micron’s expansion of its southeast Boise campus has already prompted collaborative road-routing negotiations, demonstrating how major employers and the city coordinate on transportation planning.
What Comes Next
City of Boise transportation and planning staff will begin the funded planning and environmental review process immediately. Residents and businesses in southwest Boise, along with industrial stakeholders, can expect community engagement opportunities as the planning phase progresses. The ACHD will coordinate with Boise throughout the process to ensure the extension integrates with the broader regional highway network.
A timeline for the planning completion and any subsequent construction phases has not yet been announced. Interested residents can contact the City of Boise Public Works Department or visit the city website for updates on the Lake Hazel extension planning process.