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U.S. awards contract for weir- spillway structures at Canton Lake Dam

TULSA, Okla., U.S. 9/22/11 (PennWell) -- The U.S. Army Corps of Engineers awarded a $37.57 million contract to ASI Constructors Inc. for construction of a concrete weir and hydraulic structures as part of an auxiliary spillway at Canton Lake Dam on the North Canadian River in Oklahoma.

The Corps' Tulsa District took bids for the work in July.

Canton Dam, a 68-foot-tall, 15,140-foot-long earthfill embankment, includes a 778-foot-wide service spillway at the right abutment with 16 tainter gates. Corps hydraulic studies found the existing spillway is unable to discharge a probable maximum flood and the dam is likely to fail during a major flood.

To address the inadequate spillway capacity, the Corps has begun construction of an auxiliary spillway at the right abutment. Under a previous contract, a 480-foot-wide auxiliary channel has been partially excavated. Fifty-foot-tall vertical diaphragm walls line the channel. The Corps chose a Fusegate system from Hydroplus Inc. for the new spillway.

ASI Constructors, of Pueblo West, Colo., is to perform the next phase of the work, including placement of a concrete weir approximately 35 feet deep and 70 feet long spanning the width of the channel. Other work includes a 40-foot-tall water intake monolith with a 47- by 15-foot base; 250 feet of 11-foot-diameter conduit; 30-foot-tall, 50-foot-wide Fusegates, diaphragm walls with anchors; and stoplog manufacture.

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