Ubol Ratana Dam

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"Nam Phong Dam" redirects here. It is not to be confused with Nam Pung Dam.
Ubolratana Dam
Ubol Ratana Dam.jpg
Upstream side of dam
Ubol Ratana Dam is located in Thailand
Ubol Ratana Dam
Location of Ubolratana Dam
Official name Ubol Ratana Dam
Location Khon Kaen Province, Thailand
Coordinates 16°46′31.42″N 102°37′5.97″E / 16.7753944°N 102.6183250°E / 16.7753944; 102.6183250Coordinates: 16°46′31.42″N 102°37′5.97″E / 16.7753944°N 102.6183250°E / 16.7753944; 102.6183250
Opening date 1966
Owner(s) Electricity Generating Authority of Thailand (EGAT)
Dam and spillways
Type of dam Earth core rock-fill dam
Impounds Phong River
Height 36.1 m (118 ft)
Length 885 m (2,904 ft)
Creates Ubolratana Dam Reservoir
Total capacity 2,559,000 m3 (90,400,000 cu ft)
Catchment area 410 km2 (160 sq mi)
Power station
Operator(s) Electricity Generating Authority of Thailand (EGAT)
Turbines 3 x 8.4 MW Kaplan-type
Installed capacity 25.2 MW
Annual generation 57 GWh

The Ubol Ratana Dam (pronounced: Ubon Rat) - formerly known as the "Phong Neeb Dam" - is a multi-purpose dam located in Tambon Kok-Soong, Ubolratana District, approximately 50 km (31 mi) north of Khon Kaen, Khon Kaen Province, Thailand. It was the first hydroelectric power project developed in the Thailand's northeastern area of Isan. The dam impounds the Nam Phong, a tributary of the Mekong River. The dam was given its current name by Royal Permission in 1966, in honour of Thai princess Ubolratana Rajakanya.


The dam is considered to have multi-purpose functions: electricity generation, irrigation, flood control, transportation, fisheries and as tourist attraction.[1] This is an earth core rockfill dam, and was constructed in 1964. It is 885 m (2,904 ft), and 31.5 m (103 ft) high. Its catchment area is 12,000 km2 (4,600 sq mi). Its reservoir has a maximum storage capacity of 2,559,000 m3 (90,400,000 cu ft).

In 1984, the dam was modified to reinforce dam safety and to ensure better flood protection. 30,000 people were resettled to make way for the large reservoir accompanying the dam. This resettlement resulted in a sharp decrease in forested areas in the catchment areas and an increase in erosion.

Power plant[edit]

The power plant, located at the dam, has three turbines, each with an installed capacity of 8,400 KW. The dam generates an average of 57 GWh a year. The operation of the turbines commenced on February 4, 1966, March 14, 1969 and June 12, 1968 respectively.[1]


The Ubol Ratana Dam was a product of the so-called "Lower Mekong Basin Project", which was conceived and coordinated by the Mekong Committee, the precursor to the Mekong River Commission. "So thorough have been the studies and the planning that only one of the committee's major river development projects has reached near-completion. It is the multipurpose Nam Pong project on a remote tributary of the Mekong in Northeastern Thailand. It was water from its rock-fill dam, completed in 1966, that was so needed so urgently by the village of Nong Ben in the summer of 1967. The dam, named Ubol Ratana, was producing power; its ultimate capacity will be 24,000 kilowatts".[2]

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