Project at dam starts

Work has started on the Coon Rapids Dam rehabilitation project.

Crews at work building a causeway to Dunn Island as part of the Coon Rapids Dam rehabilitation project. Photo: Minnesota Department Natural Resources website

Crews at work building a causeway to Dunn Island as part of the Coon Rapids Dam rehabilitation project. Photo: Minnesota Department Natural Resources website

The contractor, Edward Kraemer and Sons, Inc., is on site on the Anoka County side of the dam doing preliminary work, including testing and surveying, and has built a causeway from the dam to Dunn Island to move vehicles and equipment.

Under the two-year project timetable, work will take place on the Anoka County side of the dam this year, moving to the Hennepin County side in 2014.

Edward Kraemer and Sons, Inc, which is headquartered in Plain, Wis., but has a Minnesota office in Burnsville, was awarded the dam reconstruction contract in the amount of $10.804 million, according to Jason Boyle, state dam safety engineer, Minnesota Department of Natural Resources (DNR).

The company, which has been in business since 1911, has been the contractor on dam reconstruction projects in Onalaska, New Richmond and Chippewa Falls, all in Wisconsin, the firm’s website states.

A gravel road has also been created from 99th Avenue, just west of the Egret Boulevard entrance to the Coon Rapids Regional Park, through the regional park to the construction site at the dam, Boyle said.

Depending on the weather and water flow levels on the Mississippi River, the contractor hopes to start building the coffer dams in the next week, he said.

The coffer dams, which will be built above and below the dam, will divert the river to allow construction crews a dry place in which to do their job, according to Boyle.

The existing rubber dam will be removed and replaced with nine new steel gates.

A contract for the steel gates to be manufactured and delivered was awarded by the DNR last fall to the low bidder, Rodney Hunt Company, Orange, Mass. The contract totals $3.5 million.

The first delivery will be of the steel embedments that attach the gates to the concrete foundation, Boyle said.

But before the gates can be installed, a scour hole on the concrete apron downstream of the dam discovered in 2009, which resulted in the decision to replace the existing rubber gates at the dam, has to be repaired.

In fact, a new concrete apron will be built to replace the damaged apron, according to Boyle.

With the work on the Anoka County side, the walkway over the dam as well as the Anoka County boat launch have been closed for the year, Boyle said.

In fact, the walkway will remain closed until the entire project is completed next year, but the boat launch should be back open in 2014, he said.

And the water level in six-mile pool above the dam will remain at the summer level permanently, not only throughout the project’s construction period but in the years beyond once the project is completed, Boyle said.

The project is being funded by $16 million that was allocated in the 2011 state bonding bill approved by the Minnesota Legislature and signed by Gov. Mark Dayton.

With the contracts awarded for the new steel gates and the reconstruction work plus the $900,000 contract with Stanley Consultants, Minneapolis, to do the design and engineering, the project is within its budget, Boyle said.

“We are fairly comfortable with the budget,” he said.

“The late winter does not appear to have affected the project.”

Under a joint powers agreement with Three Rivers Park District, which owns and operates the Coon Rapids Dam, the DNR is solely responsible for the reconstruction of the dam.

The rehabilitation project is designed to make the dam a more effective barrier to the migration of invasive fish species, like Asian carp, as well as to extend the life of the dam.

Through the joint powers agreement, the DNR is responsible for the management of the dam as a fish barrier.

According to Stanley Consultants, the steel gates that would pass water over the top of dam would make the dam 99 percent effective as a barrier to invasive fish species.

The Coon Rapids Dam was built in 1913 by Northern States Power (NSP) Co. to generate hydroelectric power.

When power generation stopped in the 1960s, NSP donated the dam and surrounding land on both sides of the river to the park district.

Anoka County now owns all the park property on the Anoka County side of the dam.

Peter Bodley is at peter.bodley@ecm-inc.com

  • carp, the other white meat

    The length and extent of construction disruption to park and walkway users seems excessive.

    What if the carp and other invasive species have already made their way up river past the gates? What if they move past the dam by other means?

    Large portions of the trails have been fenced off quite a distance from the dam, construction road and equipment. Why was this done-are the carp and other invasive species expected to walk in?

    There has always been doubt about the suitability of rubber gates (made in Japan?) for the dam. And why wasn’t the current project expanded to include hydropower generation?

    • my .02

      Have you seen how long it takes to construct roads? Yes, it is a long time but they are trying to keep water out of an area while they work.

      At least this time the pool will be open while they are building.

      That rubber dam was never as reliable as the old gates!

      If they don’t block off the construction area someone is going to get hurt and it really is not that much of the paths.

      The dam does not affect hydro electric power. Based on my memory the turbines were by the boat launch. the dam was used to divert water to the boat launch area that then turned the turbines, dumping the water by the fishing bridge and meeting back with the main river down stream. If you have read any articles on the dam and hydro power you will know that it is still not economical.

      • up north in the city

        Refer to the article “Hydropower proposal at Coon Rapids Dam” in the July 12, 2012 CRH. It does not state that hydropower is not economical.

        In fact it states “In 2011, the Minnesota Legislature approved $16 million in state bonding to repair and renovate the dam, a project that is now in the design and engineering stage and is scheduled to start construction in 2013. As part of the dam reconstruction project, the six-mile pool above the dam would remain at its higher summer level permanently That is important in making hydropower viable at the dam, according to Larson.
        ….According to Larson, there are plenty of potential customers nearby for hydropower at the dam. Utility companies would be interested because hydropower is very reliable and predictable, Larson said.”

        The current status of license applications should be reported on by the Herald.

  • my .02

    I forgot about that article. I was looking for an older article that stated that there were interested parties but it was still not profitable but I could not find it.

    But the point is still the same, hydro power can happen outside of this project. I doubt the poster above will like what will happen to the park if that happens. They are going to have to close off more of the area permanently for the turbines and equipment.

  • concerned resident taxpayer park patron

    How about some detour signs in addition to the “Dam and Walkway Closed Until December” signs?

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