description Colorado River Delta Overview
The Colorado River Delta is the region where the Colorado River meets the Gulf of California in Mexico. Historically, this area consisted of approximately 2 million acres of lush wetlands and riparian habitats. Since the mid-20th century, the construction of upstream dams and water diversion projects, particularly the Hoover Dam and Glen Canyon Dam, has reduced the flow to the delta by approximately 90%, transforming much of the formerly fertile region into desert and significantly impacting local ecosystems.
help Colorado River Delta FAQ
Where is the Colorado River Delta?
The Colorado River Delta lies where the Colorado River reaches the northern Gulf of California in Mexico. It includes freshwater, brackish, tidal, and riparian habitats near the river's former estuary.
How large was the Colorado River Delta historically?
Historical descriptions place the wetland and riparian system at about 2 million acres. It once contained broad lagoons, river channels, mesquite, willow forests, and habitat for hundreds of bird species.
Why did the Colorado River Delta lose so much water?
Upstream dams and diversions reduced the river's flow before it reached the Gulf of California. Morelos Dam at the United States-Mexico border now diverts much of the remaining flow into canals, leaving large areas of the delta dry.
Has anyone tried to restore the Colorado River Delta?
Yes, restoration groups and government agencies have used managed water releases, including the 2014 pulse flow associated with Minute 319. The Cienega de Santa Clara, a wetland of about 40,000 acres, remains one of the delta's important surviving wetland areas.
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