Údolní nádrž Kružberk, Drinking water reservoir in Opava Region, Czech Republic

The Kružberk Reservoir is a dam on the Moravice River near the village of Kružberk, 10.3 km northwest of Vítkov. Its concrete gravity dam, 34.5 m high and 280 m long at the crest, stands on Culmian shale, greywacke and conglomerate bedrock sealed by a grouting curtain. The crest carries a parapet and five gated spillway bays between flat-topped towers, holding back a 9 km-long body of water.

Plans for a dam on the Moravice date to 1911, when the Austro-Prussian dam programme listed Kružberk among possible sites; a 1932 project by Karel Pick and Kappel was also shelved. Construction ran from 1948 to 1955 under designer Jan Čermák, and the reservoir was first used for regular flow maintenance in 1957.

The reservoir is known from Jaroslav Dietl's 1985 television series Velké sedlo, filmed here and directed by František Mudra, in which the dam appears under the name "Velké sedlo". Below the dam, a cottage settlement grew out of the service buildings that housed and fed the construction workers. Fishing is allowed only in the small Lobník reservoir on the right bank, with permits issued by the local Vítkov group of the Czech Fishing Union.

Access to the shoreline is available at several points, with paths that loop around the water and offer different viewpoints. Visitors should note that the area is exposed, and weather conditions can change quickly.

The dam was later fitted with turbines that generate electricity since 1991, giving the structure a dual purpose. This upgrade shows how the original drinking water facility was expanded over time.