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Board approves Shannon Ridge subdivision in Boise foothills with conditions on geotech, fire and wells
Summary
The board approved a 21‑lot Shannon Ridge subdivision in the Boise Foothills after staff and applicants addressed geotechnical, wildfire safety and water‑supply concerns; conditions include geotech sign‑off for each building pad and a 22,500‑gallon fire‑suppression tank.
The Ada County board approved a zone change, preliminary plat and hillside development application for the Shannon Ridge subdivision in the Boise Foothills on Wednesday, subject to conditions addressing geotechnical stability, fire protection and water supply.
Staff described the application to rezone about 120 acres of a 174‑acre property at 5125 North Bogus Basin Road from rural preservation to rural urban transition for development of 21 buildable lots (5–11 acres) while retaining a 53‑acre ranch lot in rural preservation. The project includes three private roads and hillside work; the site lies within Boise's area of city impact and the Wildland Urban Fire Interface/Hillside Overlay districts.
Staff noted neighbors and a registered neighborhood group raised concerns about geotechnical test‑hole locations, landslide potential, wildfire‑safety water supply, septic systems and impacts to downstream properties. The county required additional geotech work: exploration at building pad sites, numerical stability analyses, and geotechnical sign‑off that landslide potential is mitigated before building. North Ada County Fire and Rescue reviewed and approved a wildfire safety plan tailored to the subdivision and requested measures including a 22,500‑gallon fire‑suppression storage tank and designated refuge areas.
On water, the applicant provided hydrogeologic and well‑adequacy analyses; staff found the site is not in an identified critical groundwater area or nitrate priority area and Central District Health will approve septic on a lot‑by‑lot basis. The county engineer and others required drainage and erosion controls and road standards; the county also noted utility easements that could facilitate future connections to adjacent properties.
After detailed staff review and applicant testimony, including commitments on geotechnical follow‑up and fire‑safety measures, the board voted to approve the rezoning, plat and related applications with the conditions listed in the staff report. The approval requires geotechnical sign‑off for each building pad, incorporation of the wildfire plan into CC&Rs, and other engineering and environmental protections.
