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Lake Peachtree Spillway

Mayor Fleisch discussed the recent history of the temporary spillway repairs and the upcoming Spillway Replacement during her 2017 State of the City Address . . .

April 6, 2017                       View Presentation

The City's Engineering Firm provided an update on the design of the new spillway, noting that the final design phase was wrapping up and they were on schedule to begin developing the contract documents in May for a June bid.  The final design allowed for more detailed engineering estimates based on actual quantities of materials that would be needed.  The engineers also recommended decommissioning Fayette County's 50-year old outlet pipe through the dam, which would be replaced by outlets in the spillway (noting that, if the pipe began to leak or collapse, it would require significant digging into the dam, which would be a multi-million dollar project.  Trees on the south side of the dam would also be removed as part of the project (tree roots cause fissures and weaken the dam structure).  

December 6, 2016             View Presentation

The City's engineering firm discussed the status of the project (completion of the preliminary design phase) and updated Council that, due to the location of the new spillway, Lake Peachtree would have to be partially lowered during the construction.  The project remained on schedule to begin lowering the lake in August 2017, with a goal of completing the project by June 2018. Council agreed with the engineers' proposal to construct a Thrust Arch style bridge to span the plunge pool below the spillway and include the support design in the initial engineering.  

September 15, 2016             View Presentation

Staff and consultants recommended what will be the first or second Piano Key Weir designed spillway in the United States. Council agreed and design work is moving forward.

Due to space issues, the old spillway will have to be removed prior to construction of the new spillway, requiring the lake to be partially lowered over the winter months during construction.  The project was on track to lower Lake Peachtree and begin construction in August/September of 2017, with construction to be completed in the April/June 2018 timeframe.  Cost for the spillway was estimated at $3.5 million.  

April 21, 2016                      View Presentation

Council approved up to $300,000 to fund through Phase 5 (Final Design) of the new spillway.  See full project schedule below.

Project Schedule (as presented April 21, 2016)

Phase 1 – Schematic Design (Apr – Aug 2016) - COMPLETE
Phase 2 – Public Meetings (Aug 2016 – Sep 2016) - COMPLETE
Phase 3 – Preliminary Design (Sep 2016 – Dec 2016) - COMPLETE

Phase 4 – Design Development (Dec 2016 – Apr 2017)
Phase 5 – Final Design (Apr 2017 – Jun 2017)
Phase 6 – Contract Documents (Jun 2017 – Jul 2017)
Phase 7 – Bidding (Jul 2017 – Sep 2017)
Phase 8 – Construction (Sep 2017 – May 2018)
Phase 9 – Project Closeout (May 2018 – Jul 2018)