Description
Caltrans is seeking a qualified consulting firm to perform a comprehensive flood‑risk and feasibility study for the 11.5‑mile stretch of State Route 128 in Mendocino County. The contractor will evaluate existing conditions, model future climate‑induced flooding scenarios, develop adaptation alternatives, engage stakeholders, and deliver a final feasibility report with preferred design concepts and cost estimates. The effort is organized into six tasks covering project management, technical assessment, advisory committee coordination, public outreach, alternative development, and final reporting. The contract is a fixed‑price, not‑to‑exceed $500,000 agreement lasting roughly 18 months, with work beginning after a Notice to Proceed (estimated June 30 2026).
• Conduct hydrologic/hydraulic modeling (HEC‑RAS or equivalent) for SR 128 corridor (PM 0‑11.6) under baseline and sea‑level‑rise scenarios.
• Produce GIS‑compatible maps, environmental impact assessments, and three ranked mitigation alternatives, including 30 % design concepts.
• Facilitate a Technical Advisory Committee, quarterly stakeholder meetings, two public workshops, and a design workshop; prepare all associated reports and presentation materials.
• Deliver monthly progress reports, a draft study, a comment‑response matrix, and a final study package before contract close (Dec 31 2027).