Jackson Bluff Dam Auxiliary Spillway Project
In an ongoing effort to provide interested citizens with up-to-date information on the status of the auxiliary spillway project at the C.H. Corn Hydro Facility at the Jackson Bluff Dam, we would like to share the
following information. The City of Tallahassee received a mandate from the Federal Energy Regulatory Commission (FERC) to correct a potential safety concern with the existing earthen emergency spillway and fuse plug at the Jackson Bluff Dam.
The FERC concern was that if the existing earthen emergency spillway and/or fuse plug were to have water flow over them during a high water event, it would fail catastrophically, resulting in a large release of water in a very short period of time. This would result in significant flooding downstream due to a rapid release of the water in Lake Talquin. The FERC mandated that the City correct this potential concern. After studying several alternatives, the final remedy was to build a new concrete spillway near the existing gated spillway and eliminate the existing earthen emergency spillway and fuse plug. The proposal for a concrete spillway was presented to and approved by the FERC as an acceptable approach to address their concern.
The project was designed, approved and released for bid to obtain qualified contractors to build the new spillway. Required agency permits were then applied for. You may have heard of a challenge to one of the permits being issued by the Northwest Florida Water Management District. This permit challenge has now been resolved. In resolving the permit challenge, the City has reinforced our commitment to operate the hydro facility with no changes in upstream or downstream impacts as compared to existing conditions. The project as designed and permitted will not result in any change in lake level or any change in downstream flows below the dam. In addition, there are no plans to lower the lake level during the construction of the new spillway. The only thing you may notice is construction activities taking place at the earthen dam. The construction schedule is being developed for the contractor to mobilize and be on site September 7, 2010.
The substantial completion date for the project is anticipated to be June 1, 2011. One of the city's goals is to keep residents near the dam up to date so that you are the first to know about what is happening with this project. We have created an e-mail subscription service, where we will send project updates to anyone who wants to receive them at no cost. Simply go to Talgov.com and scroll down the home page and you'll see the link to the Email Subscription Service. You can sign up for the C.H. Corn Hydroelectric Jackson Bluff Dam Safety Project updates (bottom of the subscription page) and other City news you'd like to receive. We anticipate having an update once a month or possibly more often when construction is about to begin. As indicated above, this project is intended to enhance downstream safety under extremely high water conditions by preventing catastrophic failure of the earthen dam. As part of our efforts to ensure interested parties remain informed, you may contact Gordon King, Corn Hydro Plant Manager, with the City of Tallahassee Electric Utility at 891.5900.
The City appreciates your patience and understanding of the project.
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