The hydroelectric Bagnell Dam on the Osage River in mid-Missouri is responsible for holding back the 600-billion-gallon Lake of the Ozarks and creating 722,000 MWh of renewable electricity per year.
Designed in the 1920s by Stone & Webster, Bagnell is an unreinforced gravity dam with three sections.
With high-profile failures such as the service spillway collapse at California’s Oroville Dam fresh in the public’s mind, the 2,453-ft-long, 148-ft-tall gravity dam’s owner, Ameren Missouri, has committed to a $52-million stabilization project that will see 67 post-tension anchors added to Bagnell Dam along with 17,000 cubic yards of new concrete.
General contractor MC Industrial has had to work in extremely limited staging areas, float a crane on a barge to set 67 new anchors, and figure out a way to prevent bug holes in new vertical concrete pours. A hydro-demolition robot is handling some of the the exterior concrete demolition.
Read this fascinating article describing how innovative thinking and great cooperation are bringing this project together in ENR's New Concrete, Anchors Stabilize Bagnell Dam in the Ozarks