While the river 's course and surroundings have remained almost entirely unchanged , the majority of it being protected by the Snowy River National Park , its flow was drastically reduced in the mid 20th century , to less than 1 % ( as measured at Jindabyne ) , after the construction of four large dams ( Guthega , Island Bend , Eucumbene , and Jindabyne ) and many smaller diversion structures in its headwaters in New South Wales , as part of the Snowy Mountains Scheme .
Four large dams were built , at Guthega , Island Bend , Eucumbene , and Jindabyne , as well as many smaller dams and tunnels .