A major incident in the history of Jim Corbett National Park is the construction of the dam at Kalagarh River. It resulted as the submerging of the 80 square kilometer low lying riverine area. The consequences of it resulted in local extinction of the swamp deer to a massive reduction in the hog deer population. On the other hand area submerged led to increase in the aquatic fauna and served a better place for winter migrant. There are 109 cases poaching recorded in 1988-89 and dropped to 12 in 1997-98. In 1985, a British ornithologist and guide were killed by tiger attack in the park.