As part of a major dam safety modification program, the Corps of Engineers seeks proposals to modify spillway tainter gates at Tuttle Creek Dam north of Manhattan. Bids are due June 12.
The Corps said the gates do not meet structural design criteria for trunnion friction and wave loading. It said the work is based on a Dam Safety Assurance Program evaluation that looked at dam embankment performance during earthquake loading and the spillway’s hydrologic capacity under extreme flooding.
The contract will include structural modifications, with existing pins and bushings to be removed and replaced, and additional struts, braces, and plates to be added. Lead-based paint is to be removed and the gates repainted. The Corps estimates the price for the work will range from $5 million to $10 million.
The contract will limit the number of gates that can be detached concurrently, to limit the risk of having an inoperable gate in the event of high pool, the Corps said.
To obtain the tainter gate solicitation, No. W912DQ07R0022, prospective bidders must register on the Central Contractor Registration Internet site, www.ccr.gov, and the Federal Technical Data Solutions site, www.fedteds.gov. Search for the solicitation by number on the Federal Business Opportunities website, www.fbo.gov.
Bids are due June 12 to the Corps of Engineers, Kansas City District, Federal Building, 601 E. 12th St., Room 757, Kansas City, MO 64106-2896. For information, contact Cheryl Williams, (1) 816-389-3809.
Major ground modification under way at Tuttle Creek
The Corps already is working on modifying the dam’s foundation. TREVIICOS, of Tampa, Fla., is general contractor for the pre-construction phase of the project to stabilize sands beneath the 157-foot-tall, 7,500-foot-long rolled earth and rockfill embankment dam. (HNN 4/6/06)
In 2005, the Corps said work at Tuttle Creek was the largest ground modification effort in the world involving an operational dam, and the largest dam safety modification project the agency has tackled. Without the improvements, the Corps said, a 5.7 to 6.6 magnitude earthquake could inflict significant damage to the structure. Thirteen thousand people live downstream.
The original modification plan anticipated a total cost of $245 million over ten years. However, the Corps said it found lower-than-expected water levels beneath the dam, which could reduce the cost and duration of stabilization work.
Located on the Big Blue River upstream of Manhattan, the dam is part of a multipurpose project operated by the Corps’ Kansas City District.