Balmain Reservoir, reservoir in Australia

Balmain Reservoir is a disused, covered reservoir beneath Gladstone Park, rectangular at 180 by 108 feet (55 by 33 m) and 22 feet (6.7 m) tall. A 15-foot-6-inch (4.72 m) wall divides it into two chambers, with a walkway above; reinforced concrete pillars at 12-foot (3.7 m) intervals support the roof and park. Entry is through the adjoining valve house on Booth Street.

The reservoir was built in 1915 by the Metropolitan Board of Water Supply and Sewerage to supply water to the inner west of the city. After residents protested losing park space, the structure was placed underground and the park was restored above it.

The bandstand was not a later addition: restoring Gladstone Park and erecting it were conditions of the reservoir's 1915 construction. Its footings remain visible in the park, and the adjoining valve house on Booth Street, built in 1917, earned a National Trust of Australia Heritage Award for restoration work in 2006.

The reservoir itself is closed and cannot be entered; the valve house on the Booth Street frontage of Gladstone Park is the only built element visible at street level. Look for the bandstand footings in the park above the tanks. Sydney Water owns and maintains the whole facility.

The bandstand no longer stands: only its footings remain in Gladstone Park, next to the 1917 valve house on the Booth Street frontage. The bandstand's erection was made a condition of building the reservoir in 1915. The valve house restoration won a National Trust of Australia Heritage Award in 2006.