Canton Lake Dam Auxiliary
Spillway Excavation
- Location: Canton, OK
- Owner: U.S. Army Corps of Engineers, Tulsa District
- Technique(s) Utilized: Diaphragm Wall, Cutoff Wall, Drilled Shafts
Background
Nicholson’s largest contract to date, the project involves the construction of a new, auxiliary spillway that will accommodate a flood exceeding the current spillway’s capacity. The new spillway, which is 820 feet long and 670 feet wide, will require the excavation of 1.6 million cubic yards of material to create the channel.
The spillway excavation will be supported by diaphragm walls with permanent anchors. Together, the north and south channel walls will be constructed with 79,000 square feet of diaphragm wall. At the downstream end of the
diaphragm walls, Nicholson will construct a 670-foot-long cutoff wall with 190 drilled shafts. This is designed to reduce upstream erosion should the spillway’s fuse gate system
release water during a probable maximum flood event.
The earth excavated to create the channel will be used to construct a toe berm on the downstream of the existing earth dam for improving stability. A new drainage system that is 15 feet deep, 7 feet wide, and 11,000 feet long will be constructed at the toe of the dam. It is designed to intercept and channel seepage to a new outfall structure.
Along with the excavation, other earthwork includes demolition, clearing and grubbing 120 acres of brush, and the construction of a haul road over the North Canadian River.
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