GLADESVILLE BRIDGE Single span, fixed arch bridge crossing the full width of the waterway. Vertical clearance at the centre of the bridge is 39.5m, for a distance of 30m on either side of the centre it is not less than 37.5m and for a distance of 46m either side of the centre it is not less than 35.5m. Red triangles by day and fixed red neon lit triangular shapes by night mark the points with a vertical clearance of 23.8m, on both the upstream and downstream sides of the bridge.