Karl Johansslussen information

Historical through traffic[1] Year Reported duties 1589 628 1615 915 1654 3,358 1878 11,729 1895 17,405 1913 33,000 1976 37,000

Karl Johanslussen ("Lock of Charles John") is a lock and a sluice, along the Söderström river connecting and controlling the flood discharge between Riddarfjärden, the easternmost part of Lake Mälaren, and Saltsjön, the section of the Baltic Sea reaching into central Stockholm, Sweden. The lock is 75 metres long, 10 metres wide and 3.90 metres deep. The maximum height is 3.8 metres.^[2] The lock is closed from 2016 to 2021 due to large reconstruction works in the area.

Before World War I, few of the steam ships in the harbor of Stockholm were larger than 500 tonnes, and the previous lock thus largely sufficient. While commercial traffic was relocated to Hammarbyleden passing south of Södermalm in 1926–1929, the present lock, completed in 1935, was still used by some 3,000 commercial vessels in the 1970s, and log rafts passed through the canal until the 1950s. Its main function is however to allow passage for pleasure boats and sightseeing boats.^[1]