Imperial National Wildlife Refuge
Imperial National Wildlife Refuge, Arizona, USA – 2017. The Imperial National Wildlife Refuge protects wildlife habitat along 30 miles of the lower Colorado River in Arizona and California, including the last un-channelized section before the river enters Mexico. The backwaters and marshes in the reserve were created as a result of the Imperial Dam which was built on the Colorado River just north of Yuma in 1938. The refuge is on both the California and Arizona shores of the river and includes upland desert habitat in addition to the marshes, and Colorado River backwaters.