Work on the Red Rock Hydroelectric Project continues
Nov 19, 2014
Work on the Red Rock Hydroelectric Project continues with approximately 100 workers on the site at this time. Construction of the temporary and permanent earth retention structures on both the upstream and downstream sides of the dam is underway.
The upstream earth retention structure is a permanent diaphragm wall which, in the short term will aid in the construction of the intake, and in the long term will ensure the stability of the soil embankment of the dam. The downstream earth retention structure is a temporary secant pile wall which will allow excavation of the powerhouse. Construction on the downstream wall is expected to be complete by the end of January, while construction of the upstream wall will continue through next spring.
Work is also underway on the downstream cofferdam. The downstream cofferdam will be constructed using a combination of cellular cofferdam construction for a portion and an earthen dike with sheet piles for the remainder of the cofferdam. Once completed, the downstream cofferdam will allow excavation of the powerhouse to take place in the dry.
During a recent closure of the Pella airport for maintenance, conduit was installed under the runway for the future transmission line. By coordinating construction activities with the City of Pella’s runway repairs, MRES was able to minimize impacts to Pella airport travelers.
RRHP is expected to be completed and operational in 2018. While the wet weather this fall did affect certain aspects of construction, the “critical path” of the projects schedule is still unchanged at this time.