Lake Powell (Usa) – Location, History, Facts

Lake Powell is a large reservoir on the Colorado River in the southwestern United States formed by Glen Canyon Dam.

Lake Powell, Usa.

Country: Usa
Coordinates: 36.9361° N, 111.4842° W

Lake Powell overview

Lake Powell is a large reservoir on the Colorado River in the southwestern United States formed by Glen Canyon Dam. It occupies a canyonized river corridor between southern Utah and northern Arizona and serves as a major water-storage and hydropower facility within the Colorado River system. The impoundment creates an extensive linear waterbody that extends roughly 186 miles (300 kilometers) of river and side-canyon distance when at maximum inundation, providing a measurable reference for its scale and regional role.

Lake Powell coordinates

Lake Powell is commonly mapped at approximately 36.9361° N, 111.4842° W, or 36.9361, -111.4842 in decimal degrees.

Degrees: 36.9361° N, 111.4842° W

Decimal: 36.9361, -111.4842

Where Lake Powell is located

Lake Powell occupies a narrow, entrenched stretch of the Colorado River and adjacent side canyons, straddling northern Arizona and southern Utah. Administratively, most of the waterbody and its immediate shores lie within Glen Canyon National Recreation Area, which the U.S. National Park Service manages, while operational control of water and power remains with the U.S. Bureau of Reclamation. Approximate central coordinates are 37.03°N, 111.50°W, placing the impoundment upstream of the Grand Canyon corridor and near the city of Page, Arizona. The reservoir covers a mosaic of federal and state land management jurisdictions.

Why Lake Powell is important

Lake Powell matters for regional water storage, hydroelectric production at Glen Canyon Dam, and as a focal point in scientific and policy discussions about river regulation. It differs from natural lakes because it inundated an extensive network of sandstone canyons, submerging archaeological and paleontological sites and producing a complex, dendritic shoreline pattern. Scientific studies associated with the reservoir address sedimentation behind large dams, canyon stratigraphy preserved in Navajo Sandstone, and altered riparian and aquatic habitats. The site is also significant for its influence on interstate water-allocation arrangements and on debates over the ecological and cultural costs of river impoundment.

History of Lake Powell

Lake Powell originated when the Bureau of Reclamation constructed Glen Canyon Dam to impound the Colorado River as part of a broader federal water-storage program. Before inundation, archaeologists and survey teams documented and excavated numerous cultural sites, rock art panels, and habitations that the rising waters would cover. The reservoir’s creation reflected mid-twentieth-century priorities for basin-scale water development, flood control, and power production, and it later became central to environmental and cultural-resource debates. Subsequent decades involved scientific research on sediment transport, adjustments to resource management practices, and interagency efforts to inventory and protect remaining cultural values under federal stewardship.

Natural features of Lake Powell

Lake Powell’s physical setting is formed by deeply incised Navajo Sandstone cliffs, steep-walled side canyons, and a branching network of drowned tributary channels. The primary engineered feature is Glen Canyon Dam, an arch-gravity concrete structure that retains the reservoir and supports a hydroelectric plant at its base. Observable natural characteristics include orange-red cross-bedded sandstone exposures, bench terraces that mark former water levels, and deltaic deposits where major tributaries enter the impoundment. The reservoir’s shoreline geometry is highly irregular, with long, narrow arms that reflect the antecedent canyon morphology carved into resistant sandstone units.

Environment, protection, and monitoring of Lake Powell

Lake Powell and its shoreline environments are principally managed within Glen Canyon National Recreation Area with water operations administered by the Bureau of Reclamation under federal law. Long-term management themes include cultural-resource protection, monitoring of sediment accumulation behind the dam, study and mitigation of altered aquatic and riparian ecosystems, and control of non-native species affecting reservoir ecology. Stewardship involves interagency cooperation, scientific monitoring programs, and periodic assessments of infrastructure integrity and resource condition to maintain the reservoir’s roles in water storage and power generation while addressing conservation concerns.

Lake Powell facts

Lake Powell was named for explorer John Wesley Powell, who led a documented 1869 river expedition through the canyon country of the Green and Colorado Rivers.
The Glen Canyon Dam powerplant generates electricity that is transmitted to utilities across multiple states within the Colorado River basin.
Archaeologists carried out salvage excavations that documented hundreds of cultural and prehistoric sites prior to inundation by the reservoir.
Lake Powell's shoreline forms a dendritic network of drowned tributary canyons, producing one of the most intricate shorelines among American reservoirs.
The reservoir functions as a central element of the Colorado River Storage Project, a federal water-storage program managed by the Bureau of Reclamation.

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