IMG_3131 Resized - Project Photo

Project:

SaskPower Morrison Dam Rehabilitation – Phase 1

Location: Coronach, Saskatchewan
Description: Morrison Dam is located on the East Poplar River near Coronach, Saskatchewan less than 4 km north of the US border. The dam was constructed between 1975 and 1977 to create a cooling water reservoir for the Poplar River Power Station. Phase 1 of the rehabilitation involves upgrading the auxiliary spillway, deepening the main earth channel, excavating a pilot channel, constructing a two-stage fuse plug, and installing riprap and a concrete apron slab for erosion protection. Upgrading the riparian outlet includes installing a raised intake in the reservoir to avoid sediment blockage, installation of 60 meters of HDPE pipe liner for an unlined portion of the upstream conduit and the replacement of existing control gates in the gatewell. The project also requires the installation of a soil-cement-bentonite (SCB) slurry trench cutoff wall through the main dam embankment extending down to an approximate depth 22 meters below the top of dam. To facilitate the construction of a jet grout cutoff wall below the spillway and tying in with the SCB slurry trench cutoff wall to provide a continuous seepage barrier the top of dam had to be lowered by 2.5 meters.
Owner: SaskPower
Completion Date: 2014
Prime Consultant: Klohn Crippen Berger