The Chelmer and Blackwater Navigation is the canalisation of the Rivers Chelmer and Blackwater in Essex in the east of England. The navigation runs for 13.75 miles (22.13 km) from Springfield Basin in Chelmsford to the sea lock at Heybridge Basin near Maldon. It was opened in 1797 and remained under the control of the original company until 2003. It is now run by Essex Waterways Ltd a wholly owned subsidiary of the Inland Waterways Association.
