Lower Peirce Reservoir, Singapore's second impounding reservoir, was built in 1910 at the lower portion of Kalang Valley. It was officially commissioned in 1912. Originally known as Kalang River Reservoir, it was renamed Peirce Reservoir in 1922 after Robert Peirce, the Municipal Enginner (1901 - 1916). The reservoir was again renamed Lower Peirce Reservoir in 1975 after the construction of Upper Peirce Reservoir.