Flood Control Zone 9 is comprised of all parcels of real estate within the Ross Valley watershed. It was created by the Board of Supervisors of the Marin County Flood Control & Water Conservation District to improve flood protection in the Corte Madera Creek watershed.
The 28-square mile watershed extends from Mt. Tamalpais and White’s Hill through these communities to San Francisco Bay:
- Sleepy Hollow
- San Anselmo
- Corte Madera
The watershed includes 44 miles of stream channels.