The Teeterville dam is an earthen berm structure with a concrete spillway containing wooden stoplogs located within the road allowance of Teeterville Road. Originally the dam abutments and berm supported a bridge deck and roadway until a new bridge was constructed in the 1970’s. The original bridge and road remains on site and have been abandoned.
The structure is approximately 100 years old and experiencing noticeable deterioration. Concrete spalling and exposed steel reinforcement have been observed on the abutments, supports and wing walls. Over a period of time, the Teeterville reservoir has developed characteristic water quality impairments associated with dams being constructed on coldwater systems. Impairments include increased water temperatures, elevated turbidity, accumulated sediment deposition (primarily sand bedload) and elevated nutrient levels in the water column (nitrogen).
In 2015/16, AECOM completed a Dam Safety Review and Condition Assessment (DSRCA) of the Teeterville Dam. The scope of the DSRCA included the following:
- Background Review;
- Natural Heritage Review;
- Dam Inspections;
- Hydrotechnical Assessment;
- Dam Break Analysis;
- Inundation Mapping;
- Hazard Potential Classification;
- Selection of Inflow Design Flood;
- Assessment of Structural Integrity;
- Geotechnical Assessment; and
- Reservoir Sediment Quantity and Quality Assessment.
The DSRCA identified a number of rehabilitation and maintenance items for the Dam including:
- Repair concrete on wingwalls, piers and abutments;
- Repair steel truss or design alternatives;
- Undertake stability improvements to the dam structure; and
- Grout the void below the base slab of the Dam and underlying subgrade.
LPRCA is soliciting proposals to undertake the necessary design work to address the above items. The final design will be used to obtain approval under the Lakes and Rivers Improvement Act (LRIA) from the Ministry of Natural Resources and Forestry (MNRF). Final drawings approved by MNRF will be used for tender and construction.
