Sources refer that Hrensko was already known as a site in 1475. Later the river and Hrensko were used for timber rafting and wood storing, and the first saw mill was established. From 1530 settlers began to arrive, and from that time both grain and salt were stored in the local storages. In its trading heydays in the 18th and 19th century, Hrensko had no less than four saw mills (ond of these even served as a hospital during the cholera epidemic), and timber was transported on the river to places further away where it was used in naval shipyards.