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Diaphragm wall completed at Red Rock Hydroelectric Project

Diaphragm wall completed at Red Rock Hydroelectric Project

Aug 19

Work has been completed on a 240-foot diaphragm wall at the Red Rock Hydroelectric Project near Pella, Iowa.

The diaphragm wall is designed to hold back the existing Red Rock earthen dam on the upstream side of the dam and provide a channel for water to enter an intake structure that will send water to the hydroelectric turbine/generator.

Ames Construction, the general contractor for the project, also has completed installation of the secant pile support structure on the downstream side of the project. The secant pile wall consists of nine rows of walers (horizontal steel I-beams) and 153 tie-back anchors that were drilled into bedrock. This structure is designed to hold back the existing downstream earthen dam and to ensure stability of the dam during excavation for the powerhouse. The bottom of the excavation is currently at 25 feet below river level.  In the upcoming weeks, the excavation procedure will include underground blasting to break up rock for removal. Missouri River Energy Services (MRES) will issue a news release prior to the commencement of blasting.

In all, it is estimated that about 28 percent of construction work for the project has been done. When the project is completed in the spring of 2018, it will provide 36.4 megawatts of clean, renewable hydroelectricity, enough to power about 18,000 homes.

At its Aug. 13 meeting, the Western Minnesota Municipal Power Agency, which is providing financing for, and is the owner of the Red Rock project, approved a transmission construction contract with Aevenia of Moorhead, Minn.

The contract calls for Aevenia to build about five miles of 69-kilovolt single-pole transmission line between the Red Rock Hydro substation and the Pella West substation. It is anticipated that this transmission project will be completed in October 2016.

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Six-hour road closures planned for T-15 Aug. 3-5

Six-hour road closures planned for T-15 Aug. 3-5

Jul 28

Highway T-15 at the Red Rock Dam will be closed to traffic between the hours of 9 a.m., and 3 p.m., Aug. 3-5 to support construction of the Red Rock Hydroelectric Project.

The road closures will ensure the safety of the public and workers during installation of a temporary earth retention structure on the downstream side of the dam. 

Variable message boards will be posted along T-15 on both the Pella and Knoxville sides of the dam to inform drivers of the closures.  

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MRES releases new time-lapse video about RRHP

MRES releases new time-lapse video about RRHP

Jul 28

Check out the new video we released on the progress of the hydroelectric plant we're building near Pella, Iowa.
 

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Panel of experts commends work at Red Rock Hydroelectric Project

Panel of experts commends work at Red Rock Hydroelectric Project

Jul 24

An Independent Expert Peer Review Panel (IEPR) praised the work and diligence of the engineers, contractors, and Missouri River Energy Services (MRES) following an onsite review of the Red Rock Hydroelectric Project site June 30 – July 1. This was the IEPR’s second onsite review since construction of the project began. The first was in January.

The IEPR was at the site to conduct a Safety Assurance Review (SAR), a requirement of the U.S. Army Corps of Engineers’ Civil Works Review Policy. The SAR is conducted to ensure that good science, sound engineering and public health, safety, and welfare are the most important factors guiding the engineering design and implementation of the project.

The Panel said it was pleased to see the site staff’s continuing attention to detail relative to the potential impact of non‐uniform, soil or bedrock conditions that could impact design assumptions.

MRES, an organization of 61 member municipalities in the states of Iowa, Minnesota, North Dakota, and South Dakota, is building the Red Rock Hydroelectric Project at the Red Rock Dam on the Des Moines River near Pella, Iowa. Each MRES member owns and operates a local electric distribution utility and purchases wholesale electricity and energy services from MRES.

The project, when complete in 2018, will provide enough hydroelectricity to power about 18,000 homes. MRES has hired MWH Global as the project engineer and Ames Construction as general contractor.

During its January review, IEPR focused much of its attention on the soil‐structure interaction and the details of the ground support systems required to maintain continued support and stability of the existing Red Rock Dam embankment, saying that this “must take precedence over all other considerations, especially during the upstream construction activity.”

The Panel continued to place great emphasis on that aspect of the project in its July review. Its report commended Ames and MWH for developing and implementing high quality unique means and methods to handle the necessary large and deep excavations, complicated heavy reinforcing elements, and concrete placing techniques.

The IEPR reported that test sections of the support systems that are being built to protect the powerhouse verified that the construction means and methods have been successful and should ensure the structural capacity of these important elements.

“In general the Panel is favorably impressed with the construction thus far. The quality of the work by the contractor and the control of the construction being maintained by MWH and the owner are commendable,” the IEPR report concluded.

For more information, contact Joni Livingston at Missouri River Energy Services, phone: 605-338-4042; e-mail joni.livingston@mrenergy.com.

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Intermittent road closures planned for T-15 over dam

Jul 22

Short-duration road closures will occur along Highway T-15 at the Red Rock Dam beginning mid to late August in conjunction with the construction of the Red Rock Hydroelectric Project. These daily intermittent closures will occur between the hours of 8 a.m. and 8 p.m., Monday through Friday and continue through the month of October.

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