Arroyo Seco Ecosystem Restoration Feasibility Study EIR

Arroyo Seco Ecosystem Restoration Feasibility Study EIR

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.

La Canada-Flintridge, La Canada-Flintridge, Pasadena, South Pasadena, ..., Los Angeles, Pasadena, South Pasadena

Los Angeles

California Air Resources Board (ARB), California Department of Parks and Recreation, California Department of State Parks, Division of Boating and Waterways, California Department of Transportation, District 7 (DOT), California Highway Patrol, California Native American Heritage Commission (NAHC), California Regional Water Quality Control Board, Los Angeles Region 4 (RWQCB), California State Lands Commission (SLC), 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 (RMC), State Water Resources Control Board, Division of Water Rights, California Department of Fish and Wildlife, South Coast Region 5 (CDFW)

California Department of Fish and Wildlife, South Coast Region 5 (CDFW)

Water Facilities (Type Stormwater)

Ecosystem Restoration Feasbility Study