Located on the shore of Harbor Marsh in the Palo Alto Baylands, the Palo Alto Horizontal Levee Pilot Project is the first horizontal levee to be built in the San Francisco Bay that beneficially reuses treated wastewater for irrigation. Construction began in September 2025. … A horizontal levee is a nature-based solution that provides many benefits over traditional levees. Their unique designs have a wide gentle slope which helps a marsh adapt as sea level rises. This one will also use treated wastewater to restore a native habitat on its slope. The process will further filter pollutants out of the treated wastewater.

Other flood infrastructure news:

• The Press Democrat (Santa Rosa, Calif.): Napa’s flood control project takes next step, with new floodwalls to start in 2026​
• Marin Independent Journal (Calif.): Corte Madera Creek habitat restoration project underway