Glen Canyon Dam: overview, design, history, uses and controversies

Design and specifications

The structure is a large concrete arch-gravity type chosen to suit the steep walls of Glen Canyon. It contains a hydroelectric power plant that converts stored water into electricity for regional use, and it has gates and spillways designed for flood-control releases and routine river management. Lake Powell formed behind the dam is approximately 186 miles long at full pool and stores water measured in millions of acre-feet, a volume unit often expressed as the amount covering one acre to a depth of one foot.

History and construction

Construction of the dam began in 1956 under the authority of the U.S. Bureau of Reclamation and related federal water projects intended to manage the Colorado River basin. Reservoir filling began in the early 1960s; by 1963 the structure was holding back the main flow of the river. The project was part of a broader mid-20th-century effort to expand water storage, deliver irrigation and municipal supplies, and generate power across the rapidly developing American Southwest.

Functions, uses and importance

Glen Canyon Dam serves several interrelated purposes: it stores water for downstream deliveries and drought resilience, moderates floods, provides hydroelectric power for homes and industries, and supports extensive recreation on Lake Powell and in the surrounding Glen Canyon National Recreation Area. Its reservoir and shoreline attract boating, fishing, and tourism that are important to local economies.

Environmental and social impacts

The dam transformed a scenic canyon ecosystem into a large reservoir, a change that drew strong opposition from conservationists and prompted national debate over river management and wilderness preservation. Impacts include altered river temperatures and sediment flows that affect native fish and riverine habitats, long-term sediment accumulation behind the dam, and continuing discussions about how best to balance water demand, species protection, recreation, and cultural resources.

Further reading and resources

• Official project and technical information
• Colorado River basin context
• Local information — Page, Arizona
• Lake Powell recreation and management
• Hydropower and electricity supply
• Flood control and river operations
• Reservoir management and levels
• Definition and use of an acre-foot
• Construction history and archival material
• River flow, releases, and monitoring

Note: Glen Canyon Dam remains a central piece of Colorado River infrastructure and a focal point for managing scarce water resources in the American Southwest while addressing environmental and cultural concerns.