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I. Introduction
National wildlife refuges are guided by the mission and goals of the National Wildlife Refuge
System (NWRS), the purposes of an individual refuge, U.S. Fish and Wildlife Service
(Service) policy, and laws and international treaties. Relevant guidance includes the National
Wildlife Refuge System Administration Act of 1966, as amended by the National Wildlife
Refuge System Improvement Act of 1997, Refuge Recreation Act of 1962, and selected
portions of the Code of Federal Regulations and Fish and Wildlife Service Manual.
Cibola National Wildlife Refuge (Cibola NWR/refuge) was established in 1964 as mitigation
for straightening, channelizing, and armoring the banks of the Colorado River from
approximately river-mile 106 to 87 by the Bureau of Reclamation for flood protection, bank
stabilization, water salvage, and downstream sediment reduction. Its establishment was
recommended by the Lower Colorado River Land Use Plan of 1964 to preserve and enhance
the ancestral waterfowl wintering grounds essential to the maintenance of adequate waterfowl
populations in the Pacific Flyway (USDOI 1964). Public Land Order 3442, August 21, 1964,
established the 16,627-acre Cibola NWR. Public Law No: 109-127, December 7, 2005,
transferred 140.32 acres near Walter’s Camp from the United States Fish and Wildlife Service
to the Bureau of Land Management (BLM). Between 1964 and 2006, lands were added by
various means including transfer from other federal agencies, lease, purchase, and donation
bringing the total refuge acreage to its current 18,443 acres. The refuge purpose states these
lands are “…reserved for use of the … United States Fish and Wildlife Service, as the Cibola
National Wildlife Refuge” and “…subject to their use for reclamation purposes or wildlife
refuge purposes.”
Approximately 10 miles of the channelized portion of the lower Colorado River bisects the
refuge. Refuge lands are located in both Imperial County, California, and La Paz County,
Arizona. The city of Blythe, California, is located 20 miles north of the refuge, and Yuma,
Arizona, is 83 miles to the south. Situated within the Sonoran Desert, the refuge is located in
the historic floodplain of the Colorado River, known as the lower Colorado River Valley. In
this vast expanse of desert, the refuge contains wetland and riparian habitats including several
lakes, marshes, and backwaters, along with managed moist-soil units, agricultural fields,
mesquite forests, desert uplands, and restored cottonwood/willow forests.
Many species of birds (~288 species), reptiles (~35 species), and mammals (~60 species) have
been documented at Cibola NWR. The refuge is managed as wintering habitat for migratory
waterfowl, sandhill cranes, federally listed threatened and endangered species, and other native
wildlife. The threatened and endangered species include the Yuma Ridgway’s rail (Rallus
obsoletus yumanensis), western yellow-billed cuckoo (Coccyzus americanus), southwestern
willow flycatcher (Empidonax traillii extimus), razorback sucker (Xyrauchen texanus), bonytail
chub (Gila elegans), desert pupfish (Cyprinodon macularius), and desert tortoise (Gopherus
agassizii, Mojave Desert population).