Yonki Dam, Embankment dam in Eastern Highlands Province, Papua New Guinea

Yonki Dam is an embankment dam on the Ramu River in Papua New Guinea's Eastern Highlands Province. The structure creates a water reservoir used for hydroelectric power generation to supply the surrounding region.

Yonki Dam was built as an earth-fill embankment across the Ramu River to supply the Ramu 1 hydroelectric power station, which is owned and operated by PNG Power. Ramu 1 comprises five units: units 1, 2 and 3 rated at 15 megawatts each, and units 4 and 5 at 17 megawatts each, giving 77 megawatts in total. A second plant, Yonki Toe of Dam, is under construction at the site.

The Yonki villages beside the dam house workers who run the dam and the Ramu 1 power station, so the settlements are tied to the plant's daily operation. The Highlands Highway crosses the embankment itself, and traffic on this road passes directly over the structure.

The Highlands Highway runs over the top of the Yonki Dam embankment, so the crossing is made on the dam itself rather than on a separate bridge. The dam lies in Eastern Highlands Province on the Ramu River, and the adjacent Yonki villages serve the operation of the dam and the Ramu 1 power station. Access to the dam and plant is subject to safety restrictions, so check conditions before travelling.

Ramu 1 Power Station has five units: units 1, 2 and 3 are rated at 15 megawatts each, while units 4 and 5 are rated at 17 megawatts each, giving 77 megawatts in total. The station is owned and operated by PNG Power. A second plant, Yonki Toe of Dam, is under construction at the dam.