The North Bend Eagle

 

Dike Plan - JEO
This rendering by JEO Consulting Group shows plans for repair to a 400-foot section of dike along the Platte River. Note that the current dike is about 25% of what it was before the March flood.

Dike repair bid accepted

by Nathan Arneal
Published 10/9/19

The North Bend City Council awarded a bid to fix a weak spot in the Platte River dike Oct. 1, and work is expected to begin by the end of the month.

The weakened section of dike is about 400 feet long and sits a mile southwest of North Bend along the river between the Riverview Shores and Pioneer Lake developments. Initially, the city was told that repairs would not begin until next spring as it awaited proper permitting from the Environmental Protection Agency and the Army Corps of Engineers.

City officials were very concerned that the weakened dike could fail before next spring and lobbied to speed up the timeline. Once the city received permission to start the repairs before all the permits were in hand last month, it began advertising for bids.

Four companies submitted bids with Pruss Excavation of Dodge being awarded the job with a total bid of $324,350.

The bids were broken into several options. The base bid was to return the dike to pre-flood conditions. Pruss’s bid on that portion was $133,100. The city expects to eventually be reimbursed by the Federal Emergency Management Agency and the Nebraska Emergency Management Agency for 87.5% of that cost with the final 12.5% coming from the city or other local sources.

Kevin Krause of JEO Consulting told the city council that FEMA also offers a mitigation program to provide money to go above and beyond a repair and to make the project better what existed previously.

“Our situation was that the existing levee did not have any rock riprap on it,” Krause said. “It was just a pile of sand for all intents and purposes.”

With the river now coming into direct contact with the dike – something that did not happen before the March flood – the council asked for additional bids to place quartzite or limestone riprap on the dike. The limestone is less expensive, but would erode quicker and need to be supplemented with more rock in 10 to 15 years, Krause said. The quartzite is a denser rock and will last two to three times longer.

The council accepted Pruss’s bid of $191,250 for the quartzite option, which was $22,500 more than the limestone option.

The project will also include a small jetty of about 50 feet that will extend into the river to protect the repaired dike area. A earthen jetty in that area was wiped out by the flood.

Krause said the project will require an estimated 2,100 tons of riprap. He said the actual amount of fill material and rock needed won’t be know until the project is done because the dike will continue to erode until the repairs begin.

Pruss gave a start date of Oct. 31 in its bid.


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