Seč Dam, Concrete dam in Pardubice Region, Czech Republic

Seč Dam is a masonry gravity and arch dam of granite blocks built across a narrow gorge of the Chrudimka River between the Oheb and Vildštejn rock outcrops. Its crest is 165 m long and 42 m high, with a base 33 m wide and a crest 6.8 m wide. The reservoir behind it is 6.6 km long and holds 21.795 million m³.

The dam was built during the 1930s and caused the flooding of several small settlements and farms in the surrounding area. This was one of the major construction projects of that era in the region.

The reservoir's name comes from the town of Seč, whose cadastral boundary follows the old Chrudimka riverbed through the lake. Fragments of the original two-metre wooden penstock, used from the 1940s until 2010 because the Nazi administration withheld steel, are displayed in three places in Seč: in front of the castle, near the power station and near the caravan site.

The dam stands in a narrow gorge of the Chrudimka between the Oheb and Vildštejn rocks; a road tunnel runs beneath the Vildštejn outcrop on the way to the dam crest. The reservoir is about 20 km from Chrudim and 25 km from Pardubice. Water quality is monitored, and swimming is discouraged for children and sensitive people when quality drops to grade 3.

The wooded areas surrounding the reservoir support rare fungi species, including specialized wood-decomposing fungi that depend on mature beech trees. These habitats offer nature lovers a quieter area to explore alongside the water.