Stormwater Engineering Projects
Exixting view of Santa Anita Sediment Placement Site progress view of Santa Anita Sediment Placement Site Finish view of Santa Anita Sediment Placement Site

PROJECT SUMMARY

Santa Anita Habitat Mitigation Project Update October 2018

The Los Angeles County Flood Control District (District) will continue work on the Santa Anita Habitat Mitigation Project (HMP), located at the Santa Anita Lower Sediment Placement Site (SPS) in Arcadia. The HMP was created as compensatory mitigation for impacts associated with the Santa Anita Dam Riser Modification and Sediment Removal Project which was completed in 2012.

The goal of the HMP is to create habitat (5.5 acres of oak woodland and 2.5 acres of coastal sage scrub) in an area that was previously without any vegetation and biodiversity. The HMP is a collaborative effort between the District and a team of experts in the fields of ecology, arboriculture, wildlife biology, landscape architecture, native plant nurseries and native seed collectors. Please refer to the photo locations map below for progress photos.

Maintenance and monitoring of the area began in January 1, 2015, and work will be completed over a minimum seven-year period, or until the site meets compliance with California Department of Fish and Wildlife (CDFW) standards set for this site.

Site Preparation, Installation, and Maintenance
Site preparation has included conditioning of the placed sediment by cultivating a large volume of salvaged native compost into the soil. Tons of gravel and woody debris were placed on the site - including multiple native snags (upright, dead tree trunks) - to provide habitat value. More than 8,900 native plants and over 200 pounds of native seeds have been planted to date. All plants and seeds were taken from the local watershed to maintain genetic integrity, and native oaks were created from containers and planted acorns. A temporary fence was installed to protect oak sprouts from herbivory. Maintenance tasks include erosion control, weed management, irrigation, and stormwater management using eco-friendly materials and methods.

Biodiversity: Plants and Wildlife
More than 140 species of native plants grow on the site, which was previously only compacted sediment, including oaks (coast live oak, Engelmann oak, and San Gabriel oak), cacti, ferns, shrubs, vines, annual/perennial wildflowers, and grasses. The site also supports multiple species of beneficial fungi and non-vascular plants (e.g., moss) that are associated with the placed woody debris and other habitat features. A total of 100 vertebrate wildlife species have been observed, including bears, deer, foxes, birds, lizards, treefrogs, various species of butterflies, and other beneficial insects. In addition, several bird species have already nested on the site, including acorn woodpeckers that nest in cavities in the snags.

Miscellaneous
The restoration specialist accesses the site via the Elkins Avenue gate. The District has instructed the restoration specialist not to operate heavy trucks or transport equipment through the residential streets before 7 a.m. or after 5 p.m. Mondays through Fridays. No maintenance work will be performed during the weekends.

NO TRESPASSING is permitted on the Lower SPS. Trespassing can damage native plants, disturb sensitive wildlife such as nesting birds, and introduce noxious weeds via seeds that are spread by shoes or pets' fur.

Coastal Sage Scrub
Acorn Woodpeckers
Coastal WoodFern
San Diegan Tiger Whiptail
Placed Natural Snags
Common Gray Fox

Santa Anita Habitat Mitigation


RESOURCES

CONTACTS

For more information on the project please contact Project Manager, Maria Lee at marlee@dpw.lacounty.gov

Updated on: 01/16/2019