Prior Lake Outlet Structure Reconstruction
Normal wear and tear on the outlet structure resulted in cracking to the structure and diminishing efficiency. The outlet structure was replaced in 2010.
Project Location: Lower Prior Lake in the bay southwest of Martinson’s Island
The Prior Lake Outlet structure was originally installed in and has been operated since 1983. Normal wear and tear on the outlet structure resulted in cracking to the structure and diminishing efficiency. In 2007, partners and advisers developed a strategy and plan for updating the outlet system called the Multi-year Outlet and Channel Improvement Project.
Groundbreaking for the project began on January 11th, 2010 with the demolition and removal of the existing outlet structure. Following this a surcharge was put in place until mid April, 2010. Over the next weeks the concrete for the structure was poured, the structure was connected to the outlet pipe, plantings were installed and site restoration was completed. After a period, the inner components and weir structure were installed and though a few final cosmetic items were pending, the new Prior Lake Outlet Structure was fully operational prior to the lake rising to the discharge elevation.
The outlet structure was replaced in 2010, with an accordion-shaped fixed crest weir and a low flow gate, allowing manual discharge of water between 902.0 feet (with a permit from the DNR for March-April) and 902.5 feet.
Benefits
- Increased the efficiency of discharging water by allowing the outlet pipe to reach capacity sooner
- Provided safer conditions for staff during inspections and maintenance
- Reduces overall operations and maintenance costs by being self-operating