GDOT and private partner outline State Route 400 express‑lane plan, Alpharetta officials press on trees, noise and timing
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Summary
GDOT project manager Beau Quarles and State Route 400 Peach Partners presented a design‑build‑finance‑operate‑maintain P3 for 16 miles of express lanes and two MARTA BRT stations; council members pressed officials on tree clearing, sound walls, construction timing and local landscaping commitments. Council received a projected February 2031 opening date and a plan for March clearing and monthly stakeholder coordination.
Beau Quarles, the Georgia Department of Transportation project manager, told the City of Alpharetta on Monday evening that the State Route 400 Express Lanes project will add express lanes and build infrastructure to support MARTA bus rapid transit, with an anticipated opening in February 2031. "My name is Beau Quarles. I'm the GDOT project manager for the project," he said during a slide presentation of maps and renderings.
The $‑scale public‑private partnership is being delivered by State Route 400 Peach Partners, a consortium the presenters listed as Meridian, ACS Infrastructure and concessions partners. Javier Gutierrez, representing Peach Partners, described the P3 as a design‑build‑finance‑operate‑maintain agreement; the private developer will be responsible for operations and maintenance for multiple decades after construction.
Officials said the project will provide two express lanes in each direction in the northern segment and one express lane each way farther north, construct BRT stations at Holcomb Bridge Road and Northpointe Mall, and add two express‑lane direct connections. Quarles said clearing activities will resume March 1 and that the project has proceeded through staged notices‑to‑proceed, with a full construction notice anticipated in the coming months.
Council members repeatedly pushed presenters on local impacts. Several members pressed for details on tree replacement and landscaping after nearby clearing, and asked how noise walls, bridge finishes and other aesthetic elements would align with Alpharetta’s corridor standards. Quarles acknowledged an intergovernmental agreement (IGA) governs certain bridge finishes but said detailed landscaping requirements are still being finalized with the developer.
On noise barriers, project staff noted federal and state processes that include outreach and, at some locations, a resident vote to approve installation. "There is like, once again, there's a voting process too for the noise wall locations," Quarles said, describing the decision steps that apply to affected property owners.
Council members also sought assurances on coordination with utilities and emergency services and on how lane closures will be staged. Project staff said the contractor has strong incentives to preserve daytime capacity and that major lane closures and bridge work will be scheduled at night where feasible. The presenters described a communications plan that includes a project website, subscription alerts, door hangers and monthly stakeholder meetings.
On financing, Peach Partners said the procurement closed in late 2024 and cited a mix of private activity bonds, federal loans and equity from sponsors, plus a DOT contribution to start design work. The presenters emphasized the developer bears construction risk and recovers investment through tolling. One presenter said a contractual obligation is to keep the express lanes operating at an average of at least 55 mph.
The council did not take action on the project at the meeting. City officials and council members said they will continue coordinating with GDOT and the developer on detailed schedules, landscaping and noise‑wall design as the project moves into construction phases that will affect portions of Alpharetta.
