List of dams and reservoirs in Kerala

Periyar, IPA:[peɾijɐːr], is the longest river and the river with the largest discharge potential in the Indian state of Kerala. It is one of the few perennial rivers in the region and provides drinking water for several major towns. The Periyar is of utmost significance to the economy of Kerala. It generates a significant proportion of Kerala's electrical power via the Idukki Dam and flows along a region of industrial and commercial activity. The river also provides water for irrigation and domestic use throughout its course besides supporting a rich fishery. Due to these reasons, the river has been named the "Lifeline of Kerala". Kochi city, in the vicinity of the river mouth draws its water supply from Aluva, an upstream site sufficiently free of seawater intrusion. Twenty five percent of Kerala's industries are along the banks of river Periyar. These are mostly crowded within a stretch of 5 kilometres (3 mi) in the Eloor-Edayar region (Udhyogamandal), about 10 kilometres (6 mi) north of Kochi harbor.

The Idukki Dam is a double curvature arch dam constructed across the Periyar River in a narrow gorge between two granite hills locally known as Kuravan and Kurathi in Idukki, Kerala, India. At 168.91 metres (554.2 ft), it is one of the highest arch dams in Asia. It is constructed and owned by the Kerala State Electricity Board. It supports a 780 MW hydroelectric power station in Moolamattom, which started generating power on 4 October 1975. The dam type is a concrete, double curvature parabolic, thin arc dam. The Indo-Canadian project was inaugurated by the Prime Minister Indira Gandhi on February 17, 1976.

GandhisagarDam is situated at a distance of 168 km from the District headquarter. The Dam is constructed on the Chambal River.

Nagarjuna Sagar Dam is a masonry dam across the Krishna River at Nagarjuna Sagar which straddles the border between Palnadu district in Andhra Pradesh and Nalgonda district in Telangana. The dam provides irrigation water to the districts of Palnadu, Guntur, Nalgonda, Prakasam, Khammam, Krishna, and parts of West Godavari. It is also a source of electricity generation for the national grid.

Mullaperiyar Dam is a masonry gravity dam on the Periyar River of Idukki district of Indian state of Kerala. It is situated 150km south east of Kochi. It is located 881 m (2,890 ft) above the sea level, on the Cardamom Hills of the Western Ghats in Thekkady, Idukki District of Kerala, India. It was constructed between 1887 and 1895 by John Pennycuick and also reached in an agreement to divert water eastwards to the Madras Presidency area. It has a height of 53.6 m (176 ft) from the foundation, and a length of 365.7 m (1,200 ft). The Periyar National Park in Thekkady is located around the dam's reservoir. The dam is built at the confluence of Mullayar and Periyar rivers. The dam is located in Kerala on the river Periyar, but is operated and maintained by the neighbouring state of Tamil Nadu. Although the Periyar River has a total catchment area of 5398 km² with 114 km² downstream from the dam in Tamil Nadu, the catchment area of the Mullaperiyar Dam itself lies entirely in Kerala and thus not an inter-State river. On 21 November 2014, the water level hit 142 feet for first time in 35 years. The reservoir again hit the maximum limit of 142 feet on 15 August 2018, following incessant rains in the state of Kerala. In a UN report published in 2021, the dam was identified as one among the world's big dams which needs to be decommissioned for being 'situated in a seismically active area with significant structural flaws and poses risk to 3.5 million people if the 100+ years old dam were to fail'.

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. The dam was constructed in 1963 as a part of a hydroelectric project. Construction was led by E.U.Philipose, Superintending Engineer, Kerala State Electricity Board. It has a length of 288.80 metres (947.5 ft). The hydropower component of the dam has an installed capacity of 30 MW with firm power of 17 MW, generating 158 GWh annually. Taluks through which the river flow are Udumbanchola, Devikulam, Kothamangalam, Muvattupuzha, Kunnathunadu, Aluva, Kodungalloor and Paravur.

The Polavaram Project is an under construction multi-purpose irrigation project on the Godavari River in the Eluru District and East Godavari District in Andhra Pradesh. The project has been accorded National project status by the Central Government of India. Its reservoir back water spreads up to the Dummugudem Anicut and approx 115 km on Sabari River side. Thus back water spreads into parts of Chhattisgarh and Odisha States. It gives major boost to tourism sector in Godavari Districts as the reservoir covers the famous Papikonda National Park, Polavaram hydro electric project (HEP) and National Waterway 4 are under construction on left side of the river. It is located 40 km to the upstream of Sir Arthur Cotton Barrage in Rajamahendravaram City and 25 km from Rajahmundry Airport.

Idamalayar Dam is a multipurpose concrete gravity dam located at Ennakkal between Ayyampuzha and Bhoothathankettu in Ernakulam district of Kerala on the Idamalayar, a tributary of the Periyar River in Kerala, South India. The dam however extends east as far as Malakkappara. Completed in 1985, with a length of 373 metres (1,224 ft) and a height of 102.8 metres (337 ft), the dam created a multipurpose reservoir covering 28.3 km² (10.9 sq mi) in the scenic hills of the Anamalais.

The Cheruthoni Dam, located in Idukki District, Kerala, India, is a 138m tall concrete gravity dam. Preliminary work on this project was initiated under the leadership of Superintending Engineer, E.U.Philipose.This dam was constructed in 1976 as part of the Idukki Hydroelectric Project along with two other dams Idukki and Kulamavu. The Government of Canada aided the Project with long-term loans and grants. The dam was constructed by HCC and the consultant was S.N.C.Inc., Canada,

Malankara dam is a gravity dam constructed across Thodupuzha river for irrigation purposes. The dam is constructed to make use of the tail water from the Moolamattom power house. The project is run under the Muvattupuzha Valley Irrigation Project and KSEB. The artificial lake covers an area of around 11 square km.

Kulamavu Dam is a gravity/masonry dam on Kilivillithode which is a tributary of the Periyar river in Arakkulam village, Idukki district of Kerala, India. It is one of the three dams associated with the Idukki hydro electric power project in the Indian state of Kerala. This dam is located towards the western side of the Idukki Arch Dam. This is a gravity dam with the top portion in concrete and the bottom in masonry.

Anayirangal Dam (Malayalam: ആനയിറങ്കൽ അണക്കെട്ട്) is an earthen dam built on the Panniyar river in Chinnakanal and Santhanpara panchayats, 22 km (14 mi) from Munnar in Idukki district of Kerala, India. The dam is surrounded on one side by forest and on the other by Tata Tea Plantation. The dam is located near the Munnar - Kumily road. The water flowing from the dam reaches Kuthungal and Ponmudi dams through the Panniyar river. Power is generated at Kuthungal and Panniyar powerhouses. The dam stores water from small streams flowing from Bealram and rainwater flowing from the hills on the Tamil Nadu border. The reservoir usually fills up in June and July. The height of the dam is 34.14 metres (112.0 ft) and Length is 326.13 metres (1,070.0 ft).

Erattayar Dam is a small, diversion dam built on the Erattayar river in Erattayar grama panchayat near Kattappana town in Idukki district of Kerala, India. It acts mainly as a diversion dam to supply water to the Idukki dam. Diversion of water from Erattayar forebay to Idukki reservoir is through a tunnel called Anchuruli tunnel which is 3.77 km (2.34 mi) long. Construction of the dam was completed in the year 1989.

Kallarkutty Dam is a gravity dam built on the Muthirapuzha river, a tributary of the Periyar river, as part of the Neriamangalam Hydroelectric Project at Kallarkutty in Vellathooval panchayat of Idukki district in Kerala, India. The water discharged from the Chenkulam dam's powerhouse and the Muthirapuzha river is diverted to the Neriamangalam powerhouse near Panamkutty above the Pambla dam. The Hydroelectric Project was commissioned on 27 January 1961 to generate 45 MW of power using 3 turbines with a capacity of 15 MW. In 2006, the project was upgraded from 45 MW to 52.65 MW. Taluks through which release flow are Udumbanchola, Devikulam, Idukki, Kothamangalam, Muvattupuzha, Kunnathunadu, Aluva, Kodungalloor and Paravur.

Pamba Dam is a gravity dam built on the Pamba river in the Ranni forest area of Seethathodu panchayat in Pathanamthitta district of Kerala, India. It was built in 1967 as part of the Sabarigiri Hydroelectric Project. Sabarigiri Hydro Electric Project (IHEP) is the second largest hydro electric project in Kerala. Pamba dam's reservoir is connected to the nearby Kakki dam's reservoir by a 3.21 km (1.99 mi) long underground tunnel. The dam is 281 m (922 ft) long and 57.2 m (188 ft) high and is located at an elevation of 981.45 m (3,220.0 ft) above sea level. The dam is located in a forest area adjacent to the Periyar National Park. The water stored in the Pamba and Kakki dams is conveyed to the Sabarigiri powerhouse through penstock pipes. The dam was commissioned in 1967.

Kundala Dam, also known as Setuparvatipuram Dam, is a masonry gravity dam built on Muthirapuzha River in Mattupetty panchayat of Idukki district in Kerala, India. It is part of the Pallivasal Hydroelectric Project, the first hydroelectric project in Kerala. The dam is considered to be Asia's first arch dam. It has a height of 46.93 m (154.0 ft) and length of 259.38 m (851.0 ft). Release from dam is to river Palar and taluks through which release flow are Udumbanchola, Devikulam, Kothamangalam, Muvattupuzha, Kunnathunadu, Aluva, Kodungalloor and Paravur.

Chenkulam Dam is a gravity dam located on the Muthirapuzha river in Vellathooval panchayat of Idukki district in the Indian state of Kerala. It spans 144.50 metres (474.1 ft) long and stands 26.82 metres (88.0 ft). It hosts a 48 MW power plant.

Vellathooval Dam is a diversion dam built on the Muthirappuzha river in Vellathooval village in Devikulam taluk of Idukki district in Kerala, India. The height of the dam from the deepest foundation is 16 metres (52 ft) and length is 75 metres (246 ft). Water from the Sengulam Power House and from the Muthirapuzha river gets released to the Vellathooval dam. Water from this dam is diverted through a canal system to the powerhouse near Panniyar After the water flow is used to generate hydroelectricity, the water is released back into the river. The dam is one of the major tourist attractions in the Idukki District, Kerala.

Alesani Reservoir or Alesani Lake is a reservoir in the Haute-Corse department of France formed in 1970 by damming the Alesani River with the Alesani Dam. It is the main source of irrigation water along the east coast of Haute-Corse, and it also supplies water for human consumption and for hydroelectric power generation.

The Rizzanese Reservoir is a reservoir in the Corse-du-Sud department of France on the island of Corsica. It stores water for irrigation, and supplies the largest hydroelectric power plant in Corsica, with installed capacity of 55 MW.