Delhi Dam Construction Progress Report

June 1, 2014

General Project Information

The plan to rebuild Lake Delhi dam and restore the lake to its former lake level will be accomplished in two parts which have called Phase 1 and Phase 2. First, Phase 1 will restore the concrete portion of the dam on the north side of the river. Secondly, Phase 2 will follow later this summer will restore the earthen dike on the south side of the river including a 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. Major components of their work is to inspect and refurbish the entire concrete structure which was constructed in 1926-1928, install new large steel gates to replace the original gates with all associated mechanical and electrical equipment, provide upstream and downstream cofferdams to allow the contractor to gain assess to the dam all the way down to bedrock, and other associated control and safety related equipment.

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. This will then allow the Phase 2 contractor to complete a major cofferdam  across the current river bed which in turn will dry up the area. He will then begin the preparatory work to construct the earthen dike and labyrinth spillway on the south side.

Phase 2 work will be bid and awarded once the final DNR permit is received which we believe is eminent.

Specific Progress by Lunda on Phase 1 work through May 31, 2014 includes.

• 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.

• Begin 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 10, 2014

Pat Colgan