Pepperweed Site Restoration (Prado Basin)

Project Value



Nature’s Image


Santa Ana Watershed Association


January 2013 – 2017

As part of the U.S. Fish and Wildlife and California Department of Fish and Game mitigation requirements for the Inland Empire Brine Line Reach 4A and 4B Repairs, SAWPA worked conjunctive with the U.S. Army Corps of Engineers to identify a location within Prado Basin suitable for habitat restoration. A 10.35 acre parcel, owned by the U.S. Army Corps of Engineers and under lease to the City of Corona invaded with perennial pepperweed was selected. The project location is also known as Farmers field and is located just north of the Corona Water Reclamation Facility #1.

Perennial pepperweed is a State of California designated Class B invasive plant. The goal of the project is to restore this site to native, riparian habitat suitable for least Bell’s vireo and other avian species.

Chamber Group, under contract with SAWPA, prepared a Habitat Mitigation and Monitoring Plan (HMMP), outlining specific measures for site restoration, as well as a plant palette.

SAWPA issued a Task Order to the Santa Ana Watershed Association (SAWA) to restore the site based on the HMMP. Nature’s Image, Inc. was the firm selected by SAWA to perform the site restoration.

The restoration project began in the spring of 2012. Specifically, several attempts were made to disrupt the perennial pepperweed root system prior to planting. Plant cuttings and hydroseeding took place during January 2013. The project will conclude in the year 2017, after site restoration and a 5-year maintenance and monitoring period. The expected cost for restoration (including 5-year maintenance and monitoring) of the 10.35 acre site is approximately $322,000.