St. Mary's Dam Spillway Replacement Project

Construction of a new dam spillway and SH505 bridge:

• Bulk excavation
• Road detours
• 270,000 m³ of rock blasting
• Rock anchors
• Shotcrete
• Consolidation and curtain grouting
• Spillway chute under slab drainage system
• 42,000 m³ of cast-in-place concrete-spillway approach walls
• Headworks (pier and end monoliths) chute
• Flip bucket and apron
• Piers and abutments for the new SH505 bridge
• Four radial gates
• Hoists and stop logs
• Precast pre-stressed concrete girders for the bridge and headworks access deck
• Deck enclosure structure
• Access building and control building
• Mechanical and electrical for buildings and drainage gallery
• Geotechnical and structural instrumentation.

NAC self-performed all major project trade work, earthworks, concrete, mechanical, and bridge construction.