California Resources Corporation

Islands Grissom, White, Chaffee, and Freeman

Long Beach, California, United States

Certified through 2022

Project Name
Project Type
THUMS Islands Wildlife Habitat Landscaping Project
About the Program
The California Resources Corporation (CRC)-owned THUMS Islands are four artificial islands located in Long Beach Harbor, California. The Islands Grissom, White, Chaffee and Freeman were built between 1965 and 1968 to support local oil extraction. Stone, rock, and sand were drawn from Catalina Island and dredged from the ocean floor to create the islands, which are each about 10 acres large. Since 2004, the CRC team has worked with native landscapers to establish a garden on each island. These gardens include plants representative of the coastal sage scrub communities native to the region. With the implementation and rigorous monitoring of the native habitat gardens, the team strives to sustain these areas by involving CRC employees, community members, conservation organizations and government agencies in the long-term, active management of the land to improve wildlife habitat, provide a picturesque workplace and raise environmental awareness.

Practices and Impacts
  • The team hosted a planting event on Island White in May 2019 to re-landscape the island by planting 85 specimens of 10 native California plants. Prior to this work, the island had experienced native plant degradation and invasive species proliferation. A gravel path was also installed on the island to reduce trampling.
  • The team hosted another planting event on Island Chaffee in June 2020 to re-landscape the island by planting 83 specimens of nine different plant species. Smaller plants were used as fillers where there was adequate space between already-established natives. Medium-sized pavers were installed to create a natural path that prevents trampling during maintenance activities. A species index was created to help train and educate the maintenance staff and island visitors.
  • The islands are actively weeded and are monitored to detect any bare spots in the plant beds. Native plantings are done as needed to fill any bare spots noted.