Credit Valley Conservation Aquatic Restoration Team is pleased to announce that the construction phase for Mill Creek Weir Removal project is complete.
The in-stream concrete weir was creating a barrier for fish passage, placing a sensitive population of Brook Trout in Orangeville at risk. Matrix Solutions Inc. created a design to remove the concrete weir and improve the stream’s natural geomorphology by adding a riffle. Through this process, we discovered that private utilities (water & hydro) ran underneath the creek about 5-7m upstream of the weir. They included these utilities into the design as they were only 0.8m below the creek bed and at risk for exposure during erosion processes. We made the decision to lower the utilities below the scour limit (2.5m) in order to protect them after the weir was removed. We hired Cambridge Landscaping and Construction Ltd to complete the construction. Construction was completed within 2 weeks and resulted in: 25m of stream restored, 60 shrubs planted, 1 barrier removed, and reconnected 5km of upstream habitat for brook trout and other fish species.
ORA is pleased to report that we were a funding partner in this Project!
The ORA is pleased to partner with Credit Valley Conservation (CVC) in the Mill Creek Weir Removal Project. Mill Creek is home to an at-risk population of native Brook Trout, and the weir is a barrier to fish passage and prime habitat. Mill Creek is the lowest dam before its confluence with the Credit River.
The concrete weir is broken and cracked, and if individuals from the Brook Trout population were to breach the weir, they could be permanently trapped in a small pool on the other side, with no way back. Removing the weir will remove this hazard, open up 5 km of uninterrupted Brook Trout habitat, and increase Mill Creek’s resilience to a warming climate. The ORA applied for and received a $5,000 Lush grant towards the new detailed channel design. Continue reading