Until its confluence with the Křemelná, when it further continues as the Otava, the Vydra is 23.7 km (14.7 mi) long.

[1] The Vydra flows to Hartmanice, where it merges with the Křemelná River at an elevation of 627 m (2,057 ft) and continues as the Otava.

[2] The longest tributaries of the Vydra are:[3] In addition to Modrava, the river flows through the municipal territories of Srní and Rejštejn until it reaches the southeastern tip of the territory of Hartmanice, where it merges with the Křemelná River.

A 4.8 km (3.0 mi) long section is navigable, but it is suitable only for experienced paddlers because of the numerous rapids and cascades.

The power plant included an exhibition about the use of energy resources in the Bohemian Forest, but it was closed in 2021.