Fryšták Reservoir, Dam and cultural monument in Kostelec, Czech Republic.

Fryšták Reservoir is a dam and cultural monument in the Zlín region that stores water for the city and protects the surrounding area from flooding. The structure consists of concrete works and water management systems that allow controlled flow through the landscape.

Rising water demand in interwar Zlín led to the reservoir's construction for a group water supply. The district office in Holešov issued the permit in 1931, with plans signed by Josef Jeřábek; building ran from 1935 to 1938 and operation began in 1939. About a decade later, grouting was added beneath the dam to stop seepage, and in 1996 water-supply use was abandoned.

The whole reservoir grounds were declared a Czech cultural monument on 4 July 1997 under number 11849/7-8782, covering the waterworks, the stone channel, the dam, the intake tower, the access bridge and houses nos. 117, 118, 690 and 691. The two-storey waterworks of fair-faced brick, with two cylindrical towers linked to an underground tank, has been out of service since 1996.

The reservoir surroundings are closed to recreational use because they form a protected water-source zone, so walking or swimming by the water is not allowed. A marked tourist trail runs near the reservoir, and road II/490 crosses part of it on a bridge. The dam crown is 5 m wide at 249.00 m above sea level.

The dam's crest carries a five-metre-wide road at 249 m above sea level, and the upstream slope hides a circular gallery 2.5 m in diameter behind its concrete facing. The reservoir holds 2.95 million m³ over 62 ha, with separate summer and winter storage levels.