Powersite Dam (Forsyth, Missouri)

Design and construction

The dam was designed in 1911 by engineer Nils F. Ambursen, who popularized a form of reinforced concrete buttress dam. Ambursen-type dams use relatively thin upstream slabs supported at intervals by buttresses, a configuration that reduced material use compared with solid gravity dams of the same era. At the time of its completion Powersite was notable for being one of the largest concrete buttress dams of its kind. Construction and early operation reflected the rapid growth of small hydroelectric projects in the early 20th century.

Structure, ownership and operation

Powersite Dam is a functional generating facility and remained in private utility ownership through the 20th and 21st centuries. It has been operated by regional electric companies for decades and continues to supply power while regulating local flows. The impoundment behind the dam serves multiple roles, including reservoir storage, river regulation and recreational access along Lake Taneycomo.

Importance and impacts

As an early hydroelectric installation, Powersite Dam is significant both for regional electrification and for its engineering heritage. Like many dams, it also changed local hydraulics and ecosystems; reservoirs and altered flow regimes can affect water temperature, sediment transport and aquatic habitat. Lake Taneycomo has become a recognizable local resource for angling, tourism and shoreline activities, linked closely to the presence of the dam.

Incidents and maintenance

The dam has required periodic inspection, maintenance and upgrades typical of century-old concrete structures. In July 2015 heavy regional flooding damaged parts of the facility and prompted precautionary lowering of Lake Taneycomo to allow detailed inspection and repairs. Such events illustrate the vulnerability of aging infrastructure to extreme weather and the ongoing need for monitoring and rehabilitation.

Quick facts

• Location: Forsyth, Missouri
• River: White River
• Reservoir: Lake impoundment commonly called Lake Taneycomo
• Designer: Nils F. Ambursen (1911)
• Commissioned: 1913
• Notable: cited as the first hydroelectric dam in Missouri

The facility remains a point of local historical and engineering interest. For further reading, consult archival engineering sources and regional histories that cover early 20th-century hydroelectric development and river management practices.