Taum Sauk Hydroelectric Power Station
The Taum Sauk pumped storage plant is a power station in the St. Francois mountain region of Missouri, United States about 90 miles (140 km) south of St. Louis near Lesterville, Missouri, in Reynolds County. It is operated by Ameren Missouri.
The rebuilt upper reservoir of the Taum Sauk plant, nearing completion in this photo, is the largest roller-compacted concrete dam in North America.
Water stored in the upper reservoir is used to generate electricity during peak demand
The two generators can each produce up to 225 MW of power
The original upper reservoir, full to within a few feet of the top of the parapet wall
The St. Francois Mountains in southeast Missouri are a mountain range of Precambrian igneous mountains rising over the Ozark Plateau. This range is one of the oldest exposures of igneous rock in North America.
The name of the range is spelled out as Saint Francois Mountains in official GNIS sources, but it is sometimes misspelled in use as St. Francis Mountains to match the anglicized pronunciation of both the range and St. Francois County.
A view towards the St. Francois range from Knob Lick Mountain, a granite and rhyolite knob on the edge of the range
Boulders in Elephant Rocks State Park are residual boulders of weathered Graniteville Granite, a pluton formed 1.4 billion years ago in the Proterozoic by the cooling of magma.
Granite from this region was used for cobblestones on the St. Louis wharf and in the piers of the Eads Bridge (background).
Taum Sauk Mountain is the highest point in Missouri.