Template:Infobox lake The Lower Peirce Reservoir (Chinese: 贝雅士蓄水池下段) is one of the oldest reservoirs in Singapore. It is located near the MacRitchie Reservoir and the Upper Peirce Reservoir. It was originally created as the Peirce Reservoir but was designated as lower upon the creation of the Upper Peirce Reservoir. It is 6 hectares in size and contains many trees that are over 100 years old. There is a Lower Peirce Trail, which is a 900-metre boardwalk that takes visitors through a mature secondary forest. The reservoir is the source of the Kallang River, the longest river in Singapore.
Originally known as the Kallang River Reservoir, Singapore's second reservoir was impounded across the lower reaches of the Kallang River in 1910. In 1922, it was renamed Peirce Reservoir in commendation of the services of Robert Peirce, who was the municipal engineer of Singapore from 1901 to 1916.
In 1975, a major water supply project to develop new water resources was undertaken to support Singapore's rapid housing and industrialisation programmes. A dam was constructed at the upper reaches of the Peirce Reservoir, forming the Upper and Lower Peirce Reservoirs.
Visitors can board SBS Transit Bus Service 163, SMRT bus 167, 169, 855, 980. They can also travel by car and Lower Peirce Reservoir Park is located off Upp Thomson Road.