water tank on Ptačí hrádek

The water tank on Ptačí hrádek is a small, little-known piece of historic engineering on a hill above Český Krumlov. Nearly three centuries ago it played a key role in supplying the town's château with water, storing what had been pumped uphill from the river so it could flow back down by gravity. Today the traces of that waterworks share the hilltop with the remains of an unfinished monument that was meant to rise there a century later.

Where is it?

The hill sits west of Český Krumlov's château, within easy walking distance of the town centre, typically reached through the château gardens and up a path that climbs the slope. The site was originally known as "Na čihadlech" — the name Ptačí hrádek only became attached to it later, once it became associated with the monument project described below. The walk up rewards visitors with views over the town and the bend of the Vltava river below.

What was the tank built for?

The story begins in the first decades of the 18th century, when the château needed a reliable water supply. Engineers designed a pumping system that would lift river water to the top of the hill, into a purpose-built storage chamber — the tank itself. From there, gravity did the rest, carrying the water back down to the château's pond. The project ran into technical problems along the way: the original wooden pipes leading up to the pumping tower could not withstand the water pressure and had to be replaced with metal ones. Once that fix was in place, the pumping apparatus went into permanent operation on 19 November 1731, and it kept the château supplied with water for close to a century. The system was finally shut down in 1827, likely as maintenance costs or the château's needs changed.

The monument that was never finished

Almost a hundred years after the waterworks began operating, the hill was chosen as the site for a grand monument commemorating the victory of the allied armies over Napoleon Bonaparte at the Battle of Leipzig in 1813. The design came from Jan Sallaba, an architect attached to Krumlov's chief building office who also designed the lookout tower on Kleť mountain. His plan called for a monumental, temple-like structure with classical facades on all four sides. The ambition, however, outstripped what was actually built — the monument was never completed, and the half-finished structure on the hill is what eventually gave the place its present name.

What can you see today?

The structure has recently been reconstructed and is now privately owned, though it remains open to visitors. It draws travellers looking for a quieter corner of Český Krumlov, away from the crowds of the historic centre, with a layered history that connects 18th-century water engineering with an ambitious, unfinished tribute to the Napoleonic era. It pairs well with a walk through the château gardens and terraces, from which paths lead directly up toward the hill.

Frequently asked questions

What was the water tank on Ptačí hrádek originally used for? It was a storage reservoir that was part of a pumping system supplying Český Krumlov's château with water, which then flowed downhill by gravity.

When was the waterworks built? The pumping apparatus went into permanent operation on 19 November 1731 and remained in use until 1827.

Where does the name Ptačí hrádek come from? The hill was originally called "Na čihadlech." The name Ptačí hrádek became attached to it later, linked to the unfinished monument designed by Jan Sallaba.

Was the monument on the hill ever completed? No. The planned tribute to the 1813 victory over Napoleon at the Battle of Leipzig was never fully realized, despite its ambitious classical design.

Can the site be visited today? Yes. Although privately owned, the recently reconstructed structure remains accessible to visitors.