|Central coordinates||77o 42.00' East 30o 26.00' North|
|IBA criteria||A1, A4i|
|Year of IBA assessment||2004|
Site description The Asan Barrage, near village Dhalipur 38 km from Dehra Dun, is located at the confluence of the Yamuna hydel canal (from Dak Pathar which was built in the mid 1970s) and river Asan (a small rainfed tributary of the Yamuna). It is under the control of the Irrigation Department and has an area of 250 ha. When the water level is low, it provides good habitat for waterfowl. The dominant aquatic vegetation comprises of Potamogeton pectinatus, Typha elephantina and Ceratophyllum demersum. The southern side of the barrage is surrounded by agricultural fields. Further south, there is mixed forest typical of the Siwalik hills, consisting chiefly of Shorea robusta, Anogeissus latifolia, Lannea coromandelica, Dalbergia sissoo and Bombax ceiba. Some parts of the reservoir are covered by weeds Eichhornia crassipes and Ipomea fistulosa (Kumar and Porwal 1998).
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Baer's Pochard Aythya baeri||winter||2004||present||-||A1||Critically Endangered|
|Ruddy Shelduck Tadorna ferruginea||-||2004||present||-||A4i||Least Concern|
|Marbled Teal Marmaronetta angustirostris||winter||2004||present||-||A1||Vulnerable|
|Pallas's Fish-eagle Haliaeetus leucoryphus||resident||2004||present||-||A1||Vulnerable|
|White-rumped Vulture Gyps bengalensis||non-breeding||2004||present||-||A1||Critically Endangered|
|Greater Spotted Eagle Clanga clanga||winter||2004||present||-||A1||Vulnerable|
|Slender-billed Vulture Gyps tenuirostris||non-breeding||2004||present||-||A1||Critically Endangered|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Artificial - aquatic||-|
|Artificial - terrestrial||-|
|Land-use||Extent (% of site)|
Acknowledgements Key contributors: Arun P. Kumar, Dhananjai Mohan and S. S. Gandhi.
Gandhi, S. S. and Singh, S. K. (1995a) Avifauna of Asan Barrage. Cheetal 34(1): 29–34.
Gandhi, S. S. and Singh, S. K. (1995b) Birds at Asan Baraj. Newsletter for Birdwatchers 35: 65–68.
Kumar, A. and Porwal, M.C. (1998) Habitat evaluation of migratory waterfowls using remote sensing techniques. Project Report, Zoological Survey of India and National Remote Sensing Agency, Dehra Dun. Pp. 1-20.
Singh, A. P. (2000) Birds of the lower Garhwal Himalayas: Dehra Dun valley and neighbouring hills. Forktail 16: 101–123.
Wetlands International (2002) Waterbirds Population Estimates: Third Edition. Wetlands International Global Series No. 12, Wageningen, The Netherlands.
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Recommended citation BirdLife International (2014) Important Bird Areas factsheet: Asan Barrage. Downloaded from http://www.birdlife.org on 25/10/2014
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