The reservoir was declared as a bird sanctuary in 1983. A belt from the periphery of the lake has been declared as buffer zone for the management of the bird sanctuary. The national, as well as international, significance of the sanctuary is enhanced because of its waterfowl diversity, which was evidenced by the increase of water fowl species from 39 prior to the reservoir to 54 species at post-reservoir stage. The number of birds reported, particularly during the winter period of November to March, has steadily increased over the years. The recent records indicate a water fowl count of 130,000 in 2004 and 142,000 during 2005 migratory birds – a major increase from the average annual count of 18,887 for the period 1988–1995.
The main bird species reported are the barheaded geese, Anser indicus, northern lapwing, ruddy shelduck, northern pintail, common teal, spot-billed duck, Eurasian coot, red-necked grebe, black-headed gulls, plovers, black stork, terns, water-fowl and egrets.

The avian habitats in the reservoir area are categorized under the following heads:
Around five thousand tourists visit the bird sanctuary during the winter season, and most of them come to watch migratory birds for the first time. Efforts are being made to encourage eco-tourism to attract more tourists to the reservoir.

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