Council approves Rockwell Green subdivision annexation and preliminary plat with conditions and sound attenuation alternative compliance

Meridian’s City Council on Aug. 19 approved the annexation, preliminary plat and alternative‑compliance requests for the Rockwell Green subdivision (file H2025‑0002), a 51.15‑acre development proposed on the northwest corner of State Highway 16 and McMillan Road. The project proposes 412 building lots in an R‑15 zoning district with 27 common lots and a series of neighborhood amenities.

Staff noted the proposal is at the upper end of the medium‑density range in the comprehensive plan (gross density ≈ 8.05 units/acre) and identified concerns about proximity to a future State Highway 16 alignment, noise and air‑quality exposure, and current limitations in regional connectivity and school capacity. The applicant proposed an alternative compliance package for highway‑adjacent mitigation that includes a 6‑foot berm plus a 6‑foot wall, enhanced building facade materials for improved sound attenuation, and denser vegetation along Highway 16 (one tree per lot and 80% vegetation coverage in specified buffers versus the UDC minimums).

Noise and alternative compliance

A sound‑engineering report submitted with the application indicated estimated worst‑case peak‑hour outdoor…