Lake Delhi Dam Construction Progress Update – June 10, 2014

Delhi Dam Construction Progress Report #2

June 10, 2014

General Project Information

As discussed last time, the plan to rebuild Lake Delhi dam and restore the lake to its former lake level will be accomplished in two parts which have been called Phase 1 and Phase 2.

First, Phase 1 will restore the concrete portion of the dam on the north side of the river. Finally, Phase 2 work will follow later this summer will restore the earthen dike on the south side of the river including a new large concrete labyrinth overflow spillway.

Phase 1 was awarded to Lunda Construction Company, a large and experienced heavy structural midwest firm from Wisconsin in April 2014.

The important critical goal of Phase 1 work is to complete enough refurbishing work on the concrete structure to allow river water flow to be diverted through it from the current river bed flowing through the breeched dike area.

Current Project Progress and Status in last 10 days, June 1 to June 10, 2014

The important DNR permit allowing the entire project to be constructed including Phase 2 has been received late last week. This is great news for the project.

Phase 2 work is now ready to be bid and awarded which will lead to the completion of the dam rebuild project. The timing of the Phase 2 bidding will depend on being confident that Phase 1 work will be substantially complete by October allowing for the river to be diverted through the refurbished concrete structure. Right now in looks like Phase 2 work will be bid in July 2014 for an August 2014 contract mobilization to begin this work.

Project completion date is heavily dependent several factors including river flows being average or below, no weather extremes in the next 12 months, selecting a quality contractor for Phase 2 equivalent to our Phase 1 contractor and the actual flow in the river at the time needed to refill the lake.

Right now for planning purposes, we are planning for a July 4, 2015, date to resume enjoyment of Lake Delhi. it could be sooner if everything listed above goes great.

Specific Progress by Lunda on Phase 1 work through June 10, 2014 includes:

Work Progress from June 1, 2014, to June 10, 2014

Lunda finished installing scaffold in all spillways so subcontractor, EICS, from Farley, Iowa, can sawcut  Pier Noses for removal.

 

Continue removing silt and dewatering upstream and downstream. Approximately 90% of silt has been removed from downstream Stilling Basin.

 

Removed and disposed of all spillway concrete beams.

 

Excavation for upstream Rock Anchor Block is about 70% complete

 

Lunda has begun cleaning and roughening face of dam and drilling holes for Rock Anchor Block rebar anchorage.

 

 

Previous Work completed by Lunda

 

  • Lunda mobilized at the end of April and began by removing large rock and debris and building a cofferdam on the upstream side. Later a downstream cofferdam was build and material which filled the downstream side of the powerhouse was removed.

 

  • Demolition of all of the old spillway gates and related equipment was completed.

 

  •  installing scaffold in north and center concrete spillways.

 

  • Continue removing silt and dewatering in cofferdam areas.

 

  • Removed center spillway beam. Finished removing all gates and gate hoisting equipment.

 

  • Excavation for upstream Rock Anchor Block is 75% complete.

 

  • Lunda will begin constructing Rock Anchor Block then finish removing spillway beams and pier nosing.

Next Dam Construction Report – Tuesday, June 20, 2014

Pat Colgan

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