U.S. Fish and Wildlife Service. Region 8. Refuge Planning Office

• Humboldt Bay National Wildlife Refuge Complex
• Sacramento, Delevan, Colusa, and Sutter National Wildlife Refuges
• Sacramento, Delevan, Colusa, and Sutter National Wildlife Refuges draft comprehensive conservation plan [and environmental assessment]
• Sacramento, Delevan, Colusa, and Sutter National Wildlife Reguges