The Koyna Dam is one of the largest dams in Maharashtra, India. It is a rubble-concrete dam constructed on Koyna River which rises in Mahabaleshwar, a hillstation in Sahyadriranges. It is located in Koyna Nagar, Satara district, nestled in the Western Ghats on the state highway between Chiplun and Karad.

The main purpose of the dam is hydroelectricity with some irrigation in neighboring areas. Today the Koyna Hydroelectric Project is the largest completed hydroelectric power plant in India having a total installed capacity of 1,920 MW. Due to its electricity generating potential Koyna river is considered as the 'life line of Maharashtra'. The spillway of the dam is located at the center. It has 6 radial gates. The dam plays a vital role of flood controlling in monsoon season. The catchment area dams the Koyna river and forms the Shivasagar Lake which is approximately 50 km (31 mi) in length. It is one of the largest civil engineering projects commissioned after Indian independence. The Koyna hydro-electric project is run by the Maharashtra State Electricity Board. The dam has withstood many earthquakes in the recent past, including the devastating 1967 Koynanagar earthquake, resulting in the dam developing some cracks. After the disaster grouting of the cracks was done. Also internal holes were drilled to relieve the hydrostatic pressures in the body of the dam. Indian scientific establishment has formulated an ambitious project to drill a deep borehole in the region and intensely study the earthquake activity. This would help in better understanding and possible forecast of earthquakes. The proposal is to drill up to 7 km and study the physical, geological and chemical processes and properties of the reservoir triggered earthquake zone in real time. It would be an international project to be led by Indian scientists. In 1973 the non-overflow portion of the dam was strengthened, followed by strengthening the spillway section in 2006. Now the dam is expected to be safe against any future earthquake, including ones with a higher intensity than that of 1967.

The Koyna Dam is one of the largest dams in Maharashtra, India. It is a rubble-concrete dam constructed on Koyna River which rises in Mahabaleshwar, a hillstation in Sahyadri ranges. It is located in Koyna Nagar, Satara district, nestled in the Western Ghats on the state highway between Chiplun and Karad

One of the biggest dam in India. Very huge. For detail information do visit Koyna garden and watch Koyna dam informative film.

Dint get to see as they need a pass and I happen to b there on a public holiday

It is the 2nd highest Hydro electric power plant in India with 1960 MW power. The first one is Tehri Hydro electric power plant in Uttarakhand generating 2400 MW power

This dam is very old and having biggest hydro power plant . And there area was very popular and beautiful.

I would like to come back here to see the natural beauty and sanctuary dam area as well as the various wildlife

Koyna Hydroelectric Power Plant, is situated just below the Koyna Dam, Koyna Nagar, Satara. The Koyna Hydroelectric Plant, a branch of the Krishna Basin. It is the second-largest hydroelectric project in the country and impounds water to generate 1960 MW in four phases. The power plant was established in the year 1966 with the first two phases; Due to the increase in demand, the power plant was expanded with a new stage with a capacity of 1000 MW, called "Stage-IV". The installed capacity of this stage alone is 1000 Mw. This stage is mostly used to cater for the peak hour demands of the electric grid. The power plant uses water coming from the Koyna River for phases I, II, and IV. In Phase-IV, water is drawn directly from the reservoir in the Head Race Tunnel of length 4230 m and delivered to the Head Surge Tank.