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, the piers and abutments for the new SH505 bridge, four radial gates, hoists and stop logs, precast prestressed 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.