California Resources Evaluation System - Ventura County
- An index to environmental information for the county. Reference includes road, weather, and flood conditions, demographics, historical resources, maps.
- http://ceres.ca.gov/geo_area/counties/Ventura/

Matilija Dam Ecosystem Restoration Feasibility Study
- Final report in PDF format regarding studies to remove the dam and restore natural ecosystems and river functions. Includes list and links to the many agencies that participated.
- http://www.matilijadam.org/