Site work for a bridge / tunnel in Livermore, California. Conceptual plans call for site work for a bridge / tunnel.

The creek crossing for the Arroyo Las Positas at Airway Boulevard consists of three arch culverts. The culverts prevent the natural meandering of the channel and have caused severe sedimentation under and around the culvert causing flooding on the golf course and airport facilities. This project will remove the existing Airway Boulevard culvert and replace it with a free-span bridge, restore approximately 3,000 feet of channel and include roadway improvements. The project design will include connectors from the bike lanes on Airway Boulevard to future trail T5 in the Active Transportation Plan (ATP), west of Airway Boulevard along the north edge of the Arroyo Las Positas. This will allow the channel to become more stable by permitting natural sediment transport. This project is one of several flood mitigation measures planned for the Arroyo Las Positas area. Other projects are Golf Course Damage Repairs SD202132, Arroyo Las Positas Desilting Through Las Positas Golf Course SD202015, and Las Positas Golf Course Clubhouse Parking Lot Drainage Improvements, SD202525. The City has applied for a FEMA Hazard Mitigation Grant to replace the existing three cell arch culverts at Airway Boulevard with a clear span bridge. Project funding is for preliminary design, environmental, and grant applications. As of August 28 ,2025 ,This project is included in the City's 2025-2045 Capital Improvement Program (CIP) *Project information has been obtained through a public capital improvement plan (CIP). A CIP is a financial schedule for short- and long-range projects which is updated regularly. Information listed in the CIP often evolves based on funding availability and the project details, including timeline and value, are subject to change. The content management team will continue to pursue additional details as they become available.