Humber River Near 60 Ann Street Bank Stabilization Project
Toronto and Region Conservation Authority (TRCA) is proposing to undertake major maintenance works to replace a failed concrete rubble revetment along the Humber River near 60 Ann Street in the Town of Caledon. The purpose of this project is to reduce the risk to public safety and to provide long-term protection of the existing trail located at the top of bank. Public access along the site will be improved as part of construction by replacing the wooden staircase with a regraded trail topped with limestone screenings.
In January 2007, a Bolton community group known as Bolton Community Action Site (BCAS) identified the eroding trail to TRCA staff. BCAS was established by the Humber Watershed Planning Group of TRCA to assist with the objectives of the LEGACY: a strategy for a Healthy Humber in the community of Bolton, Ontario. The LEGACY, also known as the Humber Challenge, was formally introduced into 17 communities throughout the watershed and each of these communities were appointed as Community Action Sites to implement regeneration projects on a local basis to improve the health of the Humber River.
Initially the site was identified as requiring minor bank stabilization works to protect a small section (approximately 5 m) of the eroding Humber Valley Heritage Trail (HVHT). However, upon a more detailed assessment by TRCA in 2008, staff recommended that a geomorphic assessment be completed to determine the appropriate type and extent of bank stabilization at the site. Later the same year, TRCA retained Geomorphic Solutions (a member of the Sernas Group) to complete the aforementioned assessment. Their findings determined that ongoing erosion along the west bank of the river within this reach was expected to continue, and recommended that a bank stabilization treatment such as a vegetated buttress or live crib wall be used to provide long-term protection to the HVHT, while enhancing riparian and aquatic habitat.
Scope of Work
In general, the work involves:
- Site set-up including installation of perimeter fencing, signage, and erosion & sediment control measures;
- Dissassembly of the wooden staircase near the entrance of the trail;
- Construction of the access route by regrading the existing trail from Sackville Street to the watercourse;
- Installation of a vegetated rock buttress to stabilize the bank;
- Reinstatement of the HVHT by re-surfacing the construction access route with limestone screenings and planting of vegetation along disturbed or exposed soil surfaces;
- Final site restoration including repair of any disturbance to the staging/stockpiling area.
Construction Access & Timing
TRCA will access the site from the trail entrance opposite 86 & 88 Sackville Street. As part of the construction of the access route from Sackville Street to the watercourse, the existing wooden staircase will be dissassembled in order for the trail to be regraded. After the bank stabilization works are completed, the regraded access route will be formalized as part of the HVHT complete with limestone screenings and plantings of native vegetation.
Construction is scheduled to commence on August 16, 2012 with an approximate duration of 8 weeks excluding final site restoration which will be completed in the Fall of 2012 as weather conditions permit.
Public Notices & Contact Information
The following Notice of Project Commencement has been distributed to the local area residents, as well as to Councillor Patti Foley, Regional Councillor for Ward 5 (Bolton):
If you have any questions or comments about the project please contact:
Project Manager, Environmental Engineering Projects
Toronto and Region Conservation Authority
1 Eastville Avenue, Toronto, ON M1M 2N5
Tel: (416) 392-9690
Project Status Updates
As of August 30, 2012
TRCA has finished constructing the access route from Sackville Street down to the watercourse. This involved removal of vegetation, disassembly of the wooden staircase, and regrading of the slope.
Staff are currently installing metre bags to isolate the area of work from the rest of the watercourse to mitigate release of sediment into the watercouse.
The next step will be installation of the vegetated rock buttress in order to stabilize the bank.
As of September 14, 2012
TRCA has completed approximately half of the vegetated rock buttress at this time and expects to spend approximately 7 more days to complete the remainder of the structure.
In order to complete the in-water work, TRCA has applied-for and received permission to work outside the cold-water construction window of July 1st to September 15th.
Once the vegetated rock buttress is complete, TRCA will install restoration plantings along the bank and formalize the trail with limestone screenings.
As of October 12, 2012
The bank stabilization works (vegetated buttress) have been completed and staff are currently in the process of planting vegetation and restoring the trail with limestone screenings.
Site restoration is anticipated to be completed by October 26, 2012.
Bank stabilization and trail restoration works have been completed and the site is now open for the public to enjoy. The following photos highlight the recently completed works: