Dams of Uttarakhand :

The state of Uttarakhand is located in the northern part of India. Dams of Uttarakhand are also vital aspects of the state. They play an important role in the development of Uttarakhand and also affect lives and settlement in the state. Some of these dams are described below :

Asan Barrage : The Asan Barrage is a barrage in the Uttarakhand-Himachal Pradesh border region in Doon Valley, (Dehradun District), situated at the confluence of the Eastern Yamuna Canal and the Asan River and about 11 km (7 mi) from Dakpathar, and 28 km. northwest of Dehradun.

Directly behind the barrage on its eastern flank, water reenters the Eastern Yamuna Canal on the west side of the Yamuna River. At a distance of 4.5 km (3 mi) from the barrage on the canal, water reaches the 30 MW Kulhal Power Plant at 30°25′43″N 77°37′46″E. The power plant contains three 10 MW Kaplan turbine-generators and has a design hydraulic head of 18 m (59 ft). Once discharged from the power station, the water is conducted by the canal 13 km (8 mi) to the 72 MW Khara Power Station at 30°21′02″N 77°36′06″E in Uttar Pradesh. 

The dam creates the Asan Reservoir, also called Dhalipur Lake. The lake is popular for bird watching and 53 species are known to make a habitat there, 19 species are migratory from Eurasia.

 Bhimgoda Barrage : The Bhimgoda Barrage, also referred to as the Bhimgoda Weir or Bhimgoda Head Works, is a barrage on the Ganges River at Har ki Pauri near Haridwar in Haridwar district, Uttarakhand, India. Built as the headworks of the Upper Ganges Canal, an initial barrage was completed by 1854 and replaced twice; the final one completed in 1983. The primary purpose for the barrage is irrigation but it also serves to provide water for hydroelectric power production and control floods. The area behind the barrage is known as the Neel Dhara Bird Sanctuary and is a popular destination for various waterbirds and tourists.

Dakpathar Barrage  : The Dakpathar Barrage is a concrete barrage across the Yamuna River adjacent to Dakpathar in Uttarakhand, India. In a run-of-the-river scheme, the barrage serves to divert water into the East Yamuna Canal for hydroelectric power production at the Dhakrani and Dhalipur Power Plants. The foundation stone for the dam was laid on 23 May 1949 by India's Prime Minister Jawaharlal Nehru.[1] The project was delayed due to funding and both power stations were commissioned in 1965. The barrage is controlled by 25 floodgates and has a length of 516.5 m.

Tehri Development Project : Tehri Development Project (TDP) began as the Tehri Dam, which is a major hydroelectric project centered near the Tehri town in the state of Uttarakhand. The dam measures about 855 feet in height and is believed to be the 5th tallest dam in the entire world. The Tehri Dam is located in the Seismic Gap of the Central Himalayas. The area of its location is also known as a major geologic fault zone. As a result, the region is highly earthquake prone but the founders of the dam claim that it can withstand an earthquake of a magnitude of about 7.2 on the Richter scale. The main purpose of the Tehri Dam was power generation of a capacity of about 2400 megawatt. It also caters to the irrigation requirements of an area of about 270,000 hectares. Supplying 270 million gallons of drinking water per day to the industrialized areas of Delhi, Uttar Pradesh and Uttarakhand is another major function of the dam. 

Koteshwar, a part of the TDP hydroelectric plan is a smaller dam, constructed about 14 km downstream. It produces around 400 megawatt of electricity.

Dhauliganga Dam : Dhauliganga Dam is another dam in the state of Uttarakhand. It has been built under the Dhauliganga Power Plant Project and has been constructed at the border triangle between India, Nepal and China of the Indian Himalayas. The dam has been raised to a height of about 56 meters and is a concrete-faced rock filled dam. The crown length of this dam is about 270 m. The cut-off wall of Dhauliganga Dam is located at the upstream toe of the dam and it is built in the diaphragm walling process. The thickness of the dam is about 1 meter and water reaches to a depth of about 70 meter with a total area of about 8000 square meters. The construction and functioning of the dam is supervised by a joint venture of Kajima Corporation (Japan) and Daewoo Corporation (Republic of Korea). 

Ichari Dam : The Ichari Dam is a concrete gravity dam on the Tons River 13 km (8 mi) north of Dakpathar in Uttarakhand, India. The primary purpose of the dam is hydroelectric power production and it is a run-of-the-river-type. It was completed in 1972. The dam diverts water to the Chibro Power Station (240 MW) which is then returned to the Tons River before being fed to the Khodri Power Station (120 MW).

Kishau Dam : The Kishau Dam is a proposed gravity dam on the Tons River which will straddle the border between the Indian states of Himachal Pradesh and Uttarakhand. The project site is located about 39 km (24 mi) north of Dakpathar and upstream of the Ichari Dam. The primary purpose of the dam is power generation and downstream water supply. It will support a 660 MW power station and provide water for the irrigation of 97,076 ha (239,880 acres) of crops.

After years of negotiations over water-sharing between the two states, the dam is currently awaiting clearance from the Ministry of Environment and Forests. Construction was originally expected to begin in 2015. Approval was granted in 2018. Completion is slated for 2023.

Koteshwar Dam : The Koteshwar Dam is a gravity dam on the Bhagirathi River, located 22 km (14 mi) downstream of the Tehri Dam in Tehri District, Uttarakhand, India. The dam is part of the Tehri Hydropower Complex and serves to regulate the Tehri Dam's tailrace for irrigation and create the lower reservoir of the Tehri Pumped Storage Power Station. In addition, the dam has a 400 MW (4x100 MW) run-of-the-riverpower station. The project was approved in 2000 and its first generator was commissioned on 27 March 2011, the second on 30 March 2011. The construction site had been inundated in September 2010 by floods. The diversion tunnel was later blocked heaving/collapse of the hill in December 2010. The spillway was commissioned in Jan,2011.The last two generators were made operational in March 2012.

Lakhwar Dam : Lakhwar-Vyasi Dam project on Yamuna River, includes under-construction Lakhwar Dam and Power Station, Vyasi Dam, Hathiari Power Station and Katapathar Barrage, near the Lakhwar town in Kalsi block of Dehradun district of Uttarakhand in India, for the purpose of irrigation of 40,000 hectare land and total 927 MW hydroelectric power generation. "Lakhwar Dam" is a gravity damnear the Lohari village with 300MW power generation capacity. "Vyasi Dam" will be built 5 km downstream along with 120 MW "Hathiari Power Station" further 0.5 km downstream. "Katapathar Barrage", with the maximum ponding water level at 514.5m elevation, will be built further 2.75 km downstream of the Hathiari Power Station to supply the water to stakeholder states. Project will hold 580 million cubic metres water during monsoon and release into Yamuna during dry months.

Construction of Lakhwar dam commenced in early 2018 with the 4 year target completion date of December 2022. Vyasi dam has already been under construction since 2016.

Loharinag Pala Hydro Power Project : Loharinag Pala Hydro Power Project is a run-of-the-river hydroelectricity generating project planned by the National Thermal Power Corporation (NTPC) Ltd to have an output capacity of 600 MW (150 MW x 4 Units). The project is located on the river Bhagirathi, the headstream of the Ganges River at Loharinag Pala, below the confluence of the Songad River, next to NH 108 in Uttarkashi District of Uttarakhand state, India. This is about 100 kilometres (62 mi) upstream of the Tehri Dam.

The Loharinag-Pala project was one of several hundred dams and barrages planned or now being constructed by India, in the southern foothills of the Himalayas. Together they are expected to provide 150,000 MW of electricity for areas in which power cuts are frequent and demand is growing fast.

Maneri Dam : The Maneri Dam is a concrete gravity dam on the Bhagirathi River located at Maneri, 8.5 kilometres (5.3 mi) east of Uttarkashi in Uttarkashi district, Uttarakhand, India. The primary purpose of the dam is to divert water into a tunnel which feeds the 90 megawatts (120,000 hp) run-of-the-river Tiloth Power Plant.

Pashulok Barrage : The Pashulok Barrage is a barrage located on the Ganges River just south of Rishikesh in Dehradun district, Uttarakhand. 

In a run-of-the-river scheme, the main purpose of the barrage is to divert water into a canal on the east bank of the river which feeds water to the Chilla Power Plant downstream at 29°58′34″N 78°13′11″E, 4 km (2 mi) upstream of Haridwar. The power station contains four 36 megawatts (48,000 hp) Kaplan turbine-generators for an installed capacity of 144 megawatts (193,000 hp).

Ramganga Dam : The Ramganga Dam, also known as the Kalagarh Dam, is an embankment dam on the Ramganga River 3 km (2 mi) upstream of Kalagarh in Pauri Garhwal district, Uttarakhand. It is located within the Jim Corbett National Park. The dam is part of the Ramganga Multipurpose Project — an irrigation and hydroelectric project. It supports a 198 MW power station and provides water for the irrigation of 57,500 ha (142,086 acres) of farmland. In addition, it provides for flood control and recreation. Construction on the dam began in 1961 and it was completed in 1974. The three generators in the power station were commissioned in December 1975, November 1976 and March 1977.

Tapovan Vishnugad Hydropower Plant : The Tapovan Vishnugad Hydropower Plant is a 520 MW run-of-river hydroelectric project being constructed on Dhauliganga River in Chamoli District of Uttarakhand, India. The plant is expected to generate over 2.5k GWh of electricity annually. The power plant is located downstream on the Alaknanda River and will contain four 130 MW Pelton turbine-generators. The barrage is being constructed across the Dhauliganga River and has a catchment area of 3,100 sq km.

BHEL was awarded the contract to supply four 130MW Pelton type turbines for the Tapovan Vishnugad hydroelectric power project. The contractual scope also included the testing, commissioning and operation of the generators, switchgear and excitation system.