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Location India, Uttaranchal
Central coordinates 77o 42.00' East  30o 26.00' North
IBA criteria A1, A4i
Area 250 ha
Altitude 0
Year of IBA assessment 2004

Bombay Natural History Society

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).

Populations of IBA trigger species

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

Land-use Extent (% of site)
water management -
Notes: Irrigation

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 on 25/10/2014

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