Jochenstein Sluice, Navigation lock at Untergriesbach, Germany.

The Jochenstein lock stands at Danube kilometre 2203.2, entirely on German territory in the municipality of Untergriesbach. Its two parallel chambers each measure 227 metres long and 24 metres wide, and the lock lifts or lowers vessels by 10.34 metres. The northern chamber was built first, from 1954, followed by the southern one from 1955; both are operated by staff on site.

The lock was built as part of the Jochenstein power plant project to keep the Danube navigable. Work on the northern chamber began in 1954, the southern chamber in 1955, and the whole facility lies on German territory in the municipality of Untergriesbach. In July 2013 staff struck over restructuring and pay, halting freight and cruise traffic; Passau was unusable as a turnaround port and passengers were bused to a provisional harbour in Austria.

The lock is operated by staff on site, and its name appears on a white sign on the grey stone tower beside the chambers. In July 2013 the crew became known beyond Germany when they went on strike over restructuring at the Wasser- und Schifffahrtsamt, demanding job security and better pay.

The lock lies at Danube kilometre 2203.2, entirely on German territory in the municipality of Untergriesbach. Both chambers are operated by staff on site, so passage times depend on the crew present. The tower with the "Jochenstein" sign and the windsock stands at the water's edge, reached by a grey steel walkway.

The two chambers close differently: the southern one has a lifting gate with double hooks, the northern one a lifting gate over a raised sill. Both lower gates are mitre gates with openings for emptying, and filling happens by raising the lower panel.