The major flooding threat in Orange County has been the Santa Ana River. In 1938, the Santa Ana River flooded parts of Anaheim, Santa Ana, and Garden Grove, reportedly killing more than 50 people.…

Year Adopted: 1987 Supervisorial District: 5 Cities covered by Moulton Parkway/Laguna Niguel Road Fee Program: Aliso Viejo, Dana Point, Laguna Beach, Laguna Hills, Laguna Niguel, Laguna…

FEMA Flood Insurance Rate Maps (FIRM)Flood Insurance Rate Maps (FIRM), a.k.a. Flood Maps, can be viewed through the Federal Emergency Management Agency's (FEMA) Map Service Center. If you have the…

WORKING FOR ORANGE COUNTY OC Infrastructure Programs provides engineering services for roadways in unincorporated areas and regional flood control programs throughout Orange County. This…

Several of these manuals are available both in their entirety and broken down into sections for easier downloading.Title Computer Aided Design (CAD) Standards Manual (Version 1.0 - January 2023)…

Homeowners’ Guide for Post-Fire Flood, Debris, and Erosion Control We know from past experience that burn areas are especially susceptible to damage from flooding, and mud and debris flows that…

Year Adopted: 1981 Year Closed: 2020 Supervisorial Districts: 3 & 5  Cities covered by Plano Trabuco Road Fee Program: Rancho Santa Margarita Program Description…

Geotechnical Design Report Revised Aerially Deposited Lead Report Material Report Aerial Deposited Lead Report

The Santa Ana River and its shoreline are home to numerous threatened or endangered species, including the Santa Ana sucker, the least Bell's vireo, the southwestern willow flycatcher, and the…