Marientor gate

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Historic customs port with lock

The Marientor gate is a barrier between the Duisburg outer and inner harbor . It protects the low-lying city center of Duisburg from flooding of the Rhine .

The historic Marientor was on the Dickelsbach , the bank area there was used for trade. During the expansion of the Duisburg inner harbor, a barrage against the Rhine was built behind the stream inflow. In 1828 the main tax office for the customs port was built next to it. In December 1847 a flood destroyed the Marientorbrücke and the barrage. After initially only an emergency bridge had been built, a new lock sluice was built on the new Marientor Bridge from 1854 to 1855, the passage was 25 feet wide. Between 1882 and 1885 the barrage and bridge were renewed again, this time the passage was 11 meters wide. In 1924 the old sluice could not keep the floods away from the city center, so that today's barrage was built from 1926 to 1929.

The barrage is still in use today; it is closed when the water level at the Ruhrorter water level reaches 8.5 meters . The level indicator originally at the barrage was discontinued in the 1960s.

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Coordinates: 51 ° 26 ′ 1.6 ″  N , 6 ° 45 ′ 11 ″  E