The Interstate 580 Westbound HOV Widening Project in the Tri-Valley area of Alameda County involves 13 miles of highway widening and six bridge modifications. Project features included:

• Project Report, EIR, and two PS&E contracts
• Mandatory/Advisory Fact Sheet Exception Reports
• Utility mapping and conflict resolution coordination/relocation
• Detailed stage construction and traffic detours
• Multi-jurisdictional approval
• Environmentally sensitive areas and constraints
• Roadway rehabilitation analysis
• Future express lanes