It protects an area of seasonal deciduous forest beside the dam of a hydroelectric power plant that started operation in 2001 on the Jacuí River.

The Quarta Colônia State Park is in the municipalities of Agudo and Ibarama, Rio Grande do Sul, on the left bank of the reservoir of the Dona Francisca dam on the Jacuí River.

[2] The park was created as environmental compensation for the Dona Francisca Hydroelectric Plant on the Jacuí River.

[1] The main objective is to protect the forest remnants and species listed as endangered in Brazil such as red-spectacled amazon (Amazona pretrei), lowland paca (Cuniculus paca), brocket deer (Mazama species), Geoffroy's cat (Leopardus geoffroyi) and oncilla (Leopardus tigrinus).

The forest has been affected by human activity, including clearings and selective extraction, and is in different stages of regeneration.