Board approves $400,000 amendment for Lake Granbury —trifecta— dam assessment; $170,000 budget increase for FY2025
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Summary
The Brazos River Authority approved an amendment to the professional services agreement with Walter P. Moore to add testing and structural assessments at DeCordova Bend Dam related to stop-log systems and gate operations, increasing the contract allowance by $400,000 and adding $170,000 to the FY2025 stop-log replacement budget.
Chief Projects Officer Michael McClendon told the board July 28 the Lake Granbury trifecta project is advancing and that consultants have identified additional testing and structural evaluation needed to inform repairs and replacement of stop-log and gate systems at DeCordova Bend Dam.
McClendon said assessments found elevated friction factors on trunnion pins and bushings for gates 7, 9 and 15 and noted stress concentrated around some trunnion components. The professional services agreement with Walter P. Moore, which began in September 2024, originally totaled $3.4 million. Staff requested an amendment of $400,000 for additional testing and analysis, including strain gauge installation, greasing trials, structural capacity analyses, bridge-deck and pier/buttress analyses, and rope-access inspections. McClendon said the requested amendment covers anticipated testing and a small contingency.
Staff also requested a $170,000 budget increase in FY2025 for the Lake Granbury stop-log replacement system project to allow work this fiscal year. McClendon told directors that the dam gates are roughly 56 years old and that the additional testing is intended to inform cost-effective maintenance, potential replacement of bushings or trunnion pins, and any needed structural repairs before more extensive replacement work.
The board approved the amendment and the FY2025 budget increase (motion by Director Crone; second by Director Huber). McClendon said Walter P. Moore and Gannett Fleming are prepared to begin additional field work promptly if the board action is approved.
