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Draft EIR released for two Grant Line roundabouts; public review closes Nov. 3
Summary
Consultants presented the Draft Environmental Impact Report for two single-lane roundabouts on Grant Line Road (Alameda County) required as mitigation for Mountain House growth. The 45-day public review period closes Nov. 3; consultants said the project is developer-fee funded and estimated at about $20 million and will include biological mitigation and right-of-way acquisitions.
Consultants presented the Draft Environmental Impact Report (EIR) for the Grant Line Road Roundabout Project, two single-lane roundabouts at intersections with Altamont Pass Road and Mountain House Road in unincorporated Alameda County.
Trevor Smith explained the project stems from mitigation in the Mountain House specific plan and that the city and Alameda County executed a cooperative agreement. The roundabouts are intended to reduce peak-hour vehicle queuing and improve intersection safety and operations; consultants said the county preferred roundabouts over signals for maintenance reasons.
Charlie Simpson of Base Camp Environmental described the EIR process and said the draft is in a 45-day public review period that closes Nov. 3. He outlined key environmental topics: traffic/circulation analysis (with an appendix by TJKM), biological-resource surveys (including botanist and special-status species work), cultural/tribal coordination, and mitigation measures incorporated into the draft EIR. Consultants noted some right-of-way needs and possible culvert relocations and estimated the project cost order as roughly $20 million funded by developer fees.
Members of the council and public raised concerns about traffic flows, potential "cut-through" maneuvers and how the new geometry might affect congestion, and asked about construction impacts and an 18-month construction window. Consultants said additional preconstruction biological surveys and permitting would proceed during 2026 and that construction could begin in spring 2027 after permits, with an estimated 18 months to construct. The council will receive a final EIR and responses to comments after the public review period closes.
