Situated in the Districts of Dehradun and recently declared as a Bird Sanctuary. The wetland at Assan Barrage, is situated near the confluence of two rivers Assan and Yamuna. It's a paradise for the Bird Watchers. The Assan Reservoir is a small man-made wetland of Approx. 4 SQ. K.M. area.
The birds listed as globally endangered species in the IUCN (The International Union for the Conservation of Nature and Natural Resources) Red Data Book have been observed at Assan. Though the area of the Asan Barrage is not very big but the abundance of Birds (Domestic and Migatory) makes it an ideal place for Bird Watchers.
Assan Barrage serves as a winter passage halt for trans-Himalayan migratory birds. These birds are spotted here on their way to southern India (October-November) and again on their way back (late February-March).
During winter months these 11 migratory species, namely Brahminy Duck, Pintail, Red Crested Pochard, Gadwall, Common Pochard, Mallard, Coot, Wigeon, Common Teal, Tufted Duck, Shoveller have the 90% composition in total water birds.
May to September end offer just as exciting opportunities to see local migrants like Painted Stork, Open Billed Stork, Night Heron. A Group of 25- 40 Painted Storks can be seen in these months every year.