Ackley Lake Dam Rehabilitation (2009)
Ackley Lake Dam History
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Project History After initial construction of the dam, a slide developed on the left side of the outlet near the toe of the dam. The outlet conduit was extended 120 feet and additional drainage was installed in an attempt to stabilize the slide. Investigative drilling in 1999 revealed high artesian pressures at the toe of the dam and in 2004 a seepage exit was observed to be transporting small quantities of fine grained material. Further analysis revealed that the dam did not meet stability requirements. A rehabilitation project was initiated to address the high uplift pressures, improve spillway performance and to line the aged, corrugated metal pipe outlet. |
Work Breakdown
- Installation of toe drains
- Construction of a toe berm to protect against high artesian pressure
- Outlet conduit lining and extension to accommodate stability berm
- Installation of articulated concrete block primary spillway crest structure
- Leveling of dam crest
- Construction of auxiliary spillway
- New Gatehouse
Project Funding The total cost of the project was $1.6 Million. To finance the project, the DNRC used the following grant and loan programs:
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Project Status & Results
Project Partners Owner: DNRC Lead Design Engineer: DOWL Prime Contractor: Mungas Company Inc. |