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Lake Peachtree Spillway Replacement

Project Schedule  Path Detour Map (During Spillway Construction)

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) - COMPLETE
Phase 5 – Final Design (Apr 2017 – Jun 2017) - COMPLETE
Phase 6 – Contract Documents (Jun 2017 – Jul 2017) - COMPLETE

Phase 7 – Bidding (Jul 2017 – Aug 2017) - COMPLETE - contract awarded 8/17/2017

Phase 8 – Construction (Aug 2017 – May 2018) - See the Lake Water Level Impacts for lowering the lake by 8 feet and 6 feet (Stages 1 & 3 below)

Stage 1 - (Began Monday, August 28) Lower Lake Peachtree 8 ft. (+/- 3 weeks) - COMPLETE
Stage 2 - (September - October) Construct Coffer Dam (+/- 4 weeks) - COMPLETE
Stage 3 - (November) Lower Lake Kedron 2 ft., Raise Lake Peachtree 2 ft.  - COMPLETE
Stage 4 - (December - February) Construct New Spillway Foundation (+/- 3 months)
Stage 5 - (February) POSSIBLY raise Lake Peachtree 2 ft.
Stage 6 - (March - May) Construct New Spillway Walls & Weirs (+/- 3 months) 
Stage 7 - (May - June) Return Lakes Peachtree & Kedron to Full Pool

Phase 9 – Project Closeout (May 2018 – Jul 2018)

January 4, 2018 Update:  On Schedule, On Budget    View 1/4/18 Presentation

At the January 4 City Council Meeting, project manager Dan Davis (Integrated Science and Engineering) reported that the spillway construction is currently on schedule and on budget.  Work continues on the spillway foundation this month (note:  it must be 45 degrees F or warmer to pour concrete).  They hope to be able to raise the lake level by two more feet after this portion is completed (around February), with the goal of having the lake returning to full pool at the end of May while the project wraps up.  Work at this time does not include the path bridge that will cross Flat Creek at the Spillway (that is a separate project).  

August 17, 2017 Update
Lake Peachtree Spillway Contract Approved, Lake Lowering Begins August 28

On August 17, the Peachtree City Mayor and Council unanimously approved a $4.387 million construction contract with North Georgia Concrete for the Lake Peachtree Spillway Replacement.  North Georgia Concrete built the Lake McIntosh dam and spillway, along with the recent Pye Lake dam replacement in Fayetteville.  Fayette County and Peachtree City will jointly fund the project, which was included in the 2017 SPLOST list. 

The new spillway will feature a “piano key weir,” which allows for the greatest outflow of water during heavy storm events, while preserving the adjacent Kelly Drive/McIntosh Trail bridge.  The spillway has been designed to meet the State’s latest Category 1 dam specifications (updated in the past year), and the dam will also be upgraded to the Category 1 requirements. 

The City will issue the Notice to Proceed for September, in line with the project timeline (at top).  The water level of Lake Peachtree will begin to be lowered on Monday, August 28, by a maximum of eight feet.  The project is then scheduled to allow for incremental water level increases (by two feet in November after the cofferdam construction, and another possible two feet in February after the spillway foundation has been completed).

While all construction projects of this nature are influenced by the elements, time has been built into the schedule to anticipate bad weather, while minimizing the area of exposed lake bed during weed-growing season.  The cofferdam and a corresponding lowering of Lake Kedron by two feet in November will protect the construction area from significant rain events. 

During construction of the spillway, a path detour around the work zone will also be required.  Traffic on the east side of Lake Peachtree will connect with McIntosh Trail via Fishers Luck.  The McIntosh Trail / Kelly Drive bridge will be closed to golf cart traffic, requiring use of the path bridge over Flat Creek just south of the roadway.  A new path has been cleared from that bridge back to Kelly Drive adjacent to the Community Gardens.   View Path Detour Map

The entire spillway project remains on schedule for Lake Peachtree to begin refilling in May 2018, with completion in June 2018. 

Project Discussion

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, with completions noted)

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) - UNDERWAY
Phase 9 – Project Closeout (May 2018 – Jul 2018)