Mattupetty Dam, Storage dam in Idukki, India

Mattupetty Dam is a rebar-reinforced concrete gravity dam of the free-fall type on the Muthirapuzha River in the Kannan Devan Hills, Idukki District. It stands 83.35 m high and 237.74 m long, with an ogee spillway of three radial gates, each 6.70 by 4.95 m. A pale grey face carries a wide crest with a metal railing, and one open gate sends a white cascade down a stepped chute beside a small pale-yellow building at the base.

Mattupetty Dam was completed in 1954 as a storage dam for the Pallivasal hydroelectric project on the Muthirapuzha River, a tributary of the Periyar. Construction was led by E.U. Philipose, Superintending Engineer of the Kerala State Electricity Board. The Malayalam source describes it as the first concrete gravity dam of its kind in India, with a valve at the base for flushing out silt.

The reservoir is a known visiting ground for elephants in the region, and the surrounding water draws wild animals and birds. Near the dam lies Echo Point, a famous stop where visitors come for the speed-boat rides on the reservoir. The dam sits close to Munnar, whose streams of Muthirappuzha, Chanduvarai and Kundale meet nearby.

The site is most easily reached from nearby Munnar and offers views overlooking the surrounding mountain slopes. Visitors can also take boat rides on the reservoir to explore the landscape more fully.

The reservoir attracts wild elephants that visit the lake year-round to drink. This regular wildlife presence makes it an unusual location where visitors might observe elephants in their natural setting.