The Esteghlal dam was flooded in the neighbouring Kerman province, posing the threat of chain flooding for the Minab dam in Hormozgan, the Tasnim news agency reported.
The Minab governor ordered all villages downstream of the Esteghlal dam to leave, and the military is now building barriers to protect local buildings and crops, according to the report.
Torrential rain and snowstorms have continued in southern Iran since early January. As of Monday, they have killed five and inundated 351 homes.