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Bridgemarsh Island is in the tidal part of the River Crouch in the English county of Essex, three miles upstream from Burnham-on-Crouch. The main river channel runs to the south between the island and Canewdon, and it is separated from the mainland to the north by Bridgemarsh and Althorne Creek.
Map of Bridgemarsh Island, United Kingdom
Following a flood in 1736 Bridgemarsh Island was enclosed by a sea wall and a causeway was built giving access at low tide.
Farming was supplemented by industry with the island used as a source of clay. This led to the construction of a brickworks of which the chimney (at grid reference TQ890967) survives. A tramway linked these works to a quay that was used by Thames barges. Shortsightedly, no serious effort was made to maintain the sea wall. The flood of 1953 caused the end of regular occupation of the island, which is now a haven for wildlife and salt marsh flowers. It is owned by the Bridgemarsh Island Trust.