Arroyo Seco Ecosystem Restoration Feasibility Study EIR


SCH Number
Lead Agency
Los Angeles County Flood Control District
Document Title
Arroyo Seco Ecosystem Restoration Feasibility Study EIR
Document Type
NOP - Notice of Preparation
Present Land Use
Various land uses throughout the County

Document Description
LACFCD and the Corps are proposing to study alternatives for ecosystem restoration within 11 miles of the Arroyo Seco within the cities of La Canada-Flintridge, Pasadena, South Pasadena, Los Angeles, and an unincorporated area within Altadena in Los Angeles County, California. The FS/EIS/EIR will recommend a plan that will provide for a long-term restoration for riparian and aquatic habitat while maintaining flood risk management. The study proposes to identify a plan for opportunities for aquatic and riparian restoration along the Arroyo Seco. A range of alternatives will be analyzed in the EIR. In general, restoration these sites would encompass the range of conditions and features that existed at the Arroyo Seco historically, such as the following considerations. - Riparian habitat. - Tributary habitat providing access to higher points in the watershed. - Water quality that can support native species. - A large alluvial floodplain that offers wildlife habitat and flood attenuation and recreation and sediment control and groundwater recharge. Proposed management actions under the plan would not be designed to restore the Arroyo Seco River to pre-settlement conditions. Rather, they would be designed to restore the natural functions that were once widespread within the watershed, and to address the overall reduction in habitat quality and water quality that is apparent throughout the lower watershed. Some of the proposed management actions would be relatively small in the context of the overall watershed, but if implemented would demonstrate the potential for improvement of habitat quality throughout the watershed. Others are anticipated to be more extensive and would result in fundamental changes in the way parts other watershed are managed. Examples include eradicating invasive species and restoring native vegetation, partial or complete removal of the concrete lining of the stream, wetland restoration, floodplain reconnection, removal of revetments, creation of side channels, and conversion of turf to wetlands or swales.

Contact Information
Patrick Goodfellow
Los Angeles County Flood Control District (LACFCD)
900 South Fremont Avenue, 11th Floor
Alhambra, CA 91803

Phone : (626) 458-7034


La Canada-Flintridge La Canada-Flintridge, Pasadena, South Pasadena, ... Los Angeles Pasadena South Pasadena
Los Angeles
Cross Streets
Throughout Los Angeles County
Parcel #
State Highways
Hwy 5, 110, 134, 210, 710
LAX, Burbank
Arroyo Seco

Notice of Completion

Review Period Start
Review Period End
Development Type
Water Facilities (Stormwater Type)
Local Action
Other Action Other Action: Ecosystem Restoration Feasbility Study
Reviewing Agencies
California Air Resources Board California Department of Parks and Recreation California Department of State Parks, Division of Boating and Waterways California Department of Transportation, District 7 California Highway Patrol California Native American Heritage Commission California Regional Water Quality Control Board, Los Angeles Region 4 California State Lands Commission Caltrans, Division of Aeronautics Department of Water Resources Office of Emergency Services, California Office of Historic Preservation Resources Agency San Gabriel and Lower Los Angeles Rivers and Mountains Conservancy State Water Resources Control Board, Division of Water Rights California Department of Fish and Wildlife, South Coast Region 5

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

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