An unusual feature of the Glen Canyon power plant is the Kentucky bluegrass lawn occupying the crescent between the dam and hydroelectric plant. At the time of construction in 1964, the steel penstocks feeding water to the power plant were exposed and they experienced severe vibration when in use. Engineers decided to bury them in soil to act as a buffer against the potentially damaging vibrations. The grass was later planted to prevent the dirt from getting blown away – but also provides a mild cooling effect through evapotranspiration, reducing temperatures inside the power plant.