The Derry Road (Regional Road 7) grade separation was identified as part of the 2006 Class Environmental Assessment for Derry Road Transportation corridor conducted by the Regional Municipality of Halton. The report was initiated out of Halton’s 2004 Transportation Master Plan and recommended an underpass at the Canadian National Railway Crossing of Derry Road between Scott Boulevard and Bronte Street in Milton, Ontario.
Derry Road is an arterial road running across Halton Region from the City of Hamilton boarder to Halton’s boundary with Peel Region, crossing through both the City of Burlington and the Town of Milton. The underpass was identified to satisfy east-west capacity requirements, to reduce delays and improve safety for cyclists, pedestrians and vehicular traffic. The crossing consists of CN right-of-way passing through a densely populated area.
R.V. Anderson Associates Limited was retained by Halton Region as the Prime Consultant to design and construction management for grade separation capable of carrying two tracks across a four span railroad bridge. New Alliance is the General Contractor. The project included a number of unique challenges requiring innovative solutions for lane configurations and detours to maintain traffic flow and address safety for workers and pedestrians.
Project features include a 4200 cubic meter precast storm detention tank buried under Derry Road, a fully computerized pumping station and two oil-grit separators to address debris and pollutants from stormwater runoff. In tandem with the bridge construction, Derry Road has been lowered by approximately seven meters and accommodates four lanes of traffic.
The construction of the underpass was accelerated from 2018 to 2013 to accommodate the rapid growth in Milton. Construction is expected to be completed by summer of 2015.
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