IMPORTANT UPDATE:For information about removal of citrus trees on flood control property, see Citrus Orchard section below.Where is the Santa Ana River Canyon Habitat Area? The Santa Ana River…

Introduction The Santa Ana River Mainstem Project is designed to provide flood protection to the growing urban communities in Orange, Riverside and San Bernardino Counties . The proposed…

The San Juan Creek Flood Risk Management Feasibility Study is a joint study between the United States Army Corps of Engineers and the Orange County Flood Control District. The purpose of this…

USACE LA District Debris Yield Los Angeles District Method for Prediction of Debris YieldFebruary 1992 - Updated February 2000 In this section…

 Thank you for your interest in the upcoming Santa Ana-Delhi Channel Improvement Project. Join us for a community open house on Monday, July 24, 2023, from 5-7 p.m. at the Muth Interpretive…

Core Services One of the County’s primary objectives is to provide our community with a safe and efficient unincorporated roadway system through the planning, design, construction and maintenance…

Based on traffic accident data along Santiago Canyon Road and field evaluations by traffic engineering experts, OC Public Works has been working on a series of various safety measures to enhance the…

Project Background The bridge located along Trabuco Canyon Road, between Rose Canyon Road and Trabuco Creek Road, is nearing the end of its service life and has required repeated maintenance…

  To protect both upper and lower Mainstem project communities, Seven Oaks Dam, a 550-foot-high and 2,980-foot long rockfill dam with a gross capacity of 147,970 acre feet, has been…