Approved! – Colusa Basin Mitigation Bank


Westervelt Ecological Services has received approval of Colusa Basin Mitigation Bank (CBMB) by State and federal natural resource agencies to restore giant garter snake (Thamnophis gigas) habitat and other wetlands on 160 acres in Colusa County. The first issue of credits will soon be available.

Approval of CBMB adds to a larger matrix of conservation projects supported by government, local, non-profit and private entities which are focused on the safeguard of this species and its habitats. Colusa National Wildlife Refuge is directly adjacent to CBMB and supports a well-documented population center for GGS and provides functional habitat value and connectivity between CBMB and the nearby conserved lands.

an image of Cortina Creek


Most of the surrounding land use is either in rice production or managed as wetlands for migratory and resident species. The rice fields provide suitable habitat features for foraging GGS and expand the potential migration corridor between the Bank and habitats beyond the constraints of the channelized waterways.

CBMB is approved by the U.S. Army Corps of Engineers, the U.S. Environmental Protection Agency, the U.S. Fish and Wildlife Service and the California Department of Fish and Wildlife to provide mitigation credits to offset impacts to the giant garter snake and 404 seasonal wetlands. The CBMB service areas include portions of Tehama, Glenn, Butte, Colusa, Yolo, Sutter, and Solano counties and will assist in fulfilling the species mitigation needs due to the significant economic growth in areas, such as development along the Interstate 5 corridor.

To learn more about the site and the credits available visit the project page or contact Jeff Mathews or Travis Hemmen.