The Ponmudi Dam is a concrete gravity dam built across the Panniyar river which is a tributary of Periyar river at Konnathady panchayath of Konnathadi village in Idukki district of Kerala, India.

Construction was led by E.U.Philipose, Superintending Engineer, Kerala State Electricity Board.

[2] Taluks through which the river flow are Udumbanchola, Devikulam, Kothamangalam, Muvattupuzha, Kunnathunadu, Aluva, Kodungalloor and Paravur.

The two penstock pipe lines are designed to carry a discharge of 17.88 cubic metres (631 cu ft) per second.

[5][9] In a major disaster at the project site, which occurred 17 September 2007, one of the penstock valves burst causing the death of 7 people, destroying 15 houses, and damaging 150 acres (61 ha) of crops.