 From the late 19th century into the early mid @-@ 20th century , bloodsucking flies sometimes referred to as " Golubac mosquitoes " thrived in the area . They were particularly dangerous to livestock , some years killing off entire herds of cattle . After World War I , a road was constructed that went through both of the fort 's portcullises . This road is the shortest link between Serbia and eastern parts of the Balkan peninsula . Between 1964 – 72 , a hydroelectric dam was built in the Iron Gate gorge , significantly elevating the river 's water level . As a result , the lower edge of the slope and corresponding parts of the fortress are now flooded . 
