Documents for Public Review

Aliso Creek Mainstem Ecosystem Restoration Project

Draft Environmental Impact Statement/Environmental Impact Report

The U.S. Army Corps of Engineers (Corps), in cooperation with Orange County Public Works, Orange County, California announces the availability of a Draft Integrated Feasibility Report (Draft IFR) including the Feasibility Report, Environmental Impact Statement (EIS) and Environmental Impact Report (EIR) #630 (IP 17-066) for the Aliso Creek Mainstem Ecosystem Restoration Study, Orange County, California for review and comment. The study evaluates opportunities for restoring degraded aquatic and riparian ecosystem structure and function, riverine and floodplain system connectivity, stream channel stability and protection of critical public infrastructure, including both regional water supply and wastewater conveyance pipelines along the lower Aliso Creek Mainstem in Orange County, California. A Notice of Intent to prepare the Draft EIS was published on April 9, 2009 in the Federal Register. A public scoping meeting was conducted on May 7, 2009 in the City of Mission Viejo, California.

The Federal lead agency responsible for implementing the National Environmental Policy Act (NEPA) is the Corps. The local lead agency responsible for implementing the California Environmental Quality Act (CEQA) is the Orange County Public Works (OCPW). The Draft IFR evaluates the alternatives carried forward for detailed environmental analysis. The environmental consequences related to the proposed project and other alternatives are addressed in the Draft IFR. This document is written in compliance with NEPA, CEQA, and other applicable environmental laws and regulations. The Draft IFR is available for a 45-day review period pursuant to NEPA. Written comments pursuant to NEPA will be accepted until the close of public review at 5:00 pm PST on Monday, November 28, 2017.

As part of the public involvement process, notice is hereby given by the Corps’ Los Angeles District and County of Orange of a public review meeting scheduled for:
Wednesday, October 17, 2017 from 6:00 pm to 9:00 pm
Laguna Hills Community Center and Sports Complex - Heritage Room C
25555 Alicia Parkway
Laguna Hills, California 92653

The public meeting will allow participants the opportunity to comment on the IFR. Attendance at the public hearing is not necessary to provide comments. If American Sign Language or other accommodations are requested is required, please rsvp to Ms Deborah Lamb at Additional information can be found on the Corps website

The Aliso Creek Mainstem Ecosystem Restoration Draft IFR EIS EIR is available for downloading via the links below. 

There are four Technical Appendices,these have been separated into smaller file sizes for convenience when downloading. 

The Aliso Creek Mainstem Ecosystem Restoration Draft IFR EIS EIR is available in a printed format during office hours from 8:00 am to 5:00 pm at OCPW offices located at 2301 N. Glassell Street-First Floor, Orange, CA 92865

The OC Plan for North and Central Orange County Integrated Regional Water Management Plan
(The OC Plan) DRAFT

The OC Plan draft is posted and available for review and download by clicking on the link below. If you have questions or are unable to download The OC Plan please contact Iris Corpus.

Comments on the plan should be emailed to and will be accepted until December 20, 2017.

To access The OC Plan Click →here.