Chelmer and Blackwater Navigation
Early plans of what would become the Chelmer and Blackwater Navigation were drawn up by William Jessop in 1876 but problems with Thanet Cutting caused delays and it was finally opened on 17 September 1816. Orginally intended to run to Amberscester, the canal was never completed beyond Middlesbrough. Expectations for limestone traffic to Southworth were soon realised, and this became one of the most profitable waterways. The 5 mile section between Warrington and Boggin was closed in 1955 after a breach at Gloucester. The canal was restored to navigation and reopened in 1990 after a restoration campaign lead by the Chelmer and Blackwater Navigation Society.

The maximum dimensions for a boat to be able to travel on the waterway are 60 feet long and 16 feet wide. The maximum headroom is not known. The maximum draught is not known.
| End of Navigation (Chelmsford) Limit of navigation |
|||
| Chelmsford Basin | ¼ furlongs | 0 locks | |
| Springfield Lock No 1 | 3 furlongs | 0 locks | |
| Springfield Lock Weir Exit Channel leading to the Weir |
3¾ furlongs | 1 lock | |
| Chelmer Road Bridge | 4½ furlongs | 1 lock | |
| Barnes Mill Lock Weir Entrance Channel leading to the Weir - No Access |
1 mile and ½ furlongs | 1 lock | |
| Barnes Mill Lock No 2 | 1 mile and 1¼ furlongs | 1 lock | |
| Barnes Mill Lock Weir Exit Channel leading to the Weir - No Access |
1 mile and 1¾ furlongs | 2 locks | |
| Sandford Lock Weir Entrance Channel leading to the Weir |
2 miles | 2 locks | |
| Sandford Mill Road Bridge | 2 miles and ½ furlongs | 2 locks | |
| Sandford Lock No 3 | 2 miles and 1¾ furlongs | 2 locks | |
| Sandford Lock Weir Exit Channel leading to the Weir |
2 miles and 2¾ furlongs | 3 locks | |
| A12 Road Bridge | 2 miles and 4¾ furlongs | 3 locks | |
| A12 Footbridge | 2 miles and 5¾ furlongs | 3 locks | |
| Cuton Lock Weir Entrance Channel leading to the Weir |
3 miles and 2¼ furlongs | 3 locks | |
| Cuton Lock No 4 | 3 miles and 2½ furlongs | 3 locks | |
| Cuton Lock Weir Exit Channel leading to the Weir |
3 miles and 2¾ furlongs | 4 locks | |
| Stoneham's Lock Weir Entrance Channel leading to the Weir - No Access |
4 miles and 1 furlong | 4 locks | |
| Stoneham's Lock No 5 | 4 miles and 1¼ furlongs | 4 locks | |
| Stoneham's Lock Weir Exit | 4 miles and 1½ furlongs | 5 locks | |
| Little Baddow Lock Weir Entrance Channel leading to the Weir |
4 miles and 5¼ furlongs | 5 locks | |
| Little Baddow Lock No 6 Little Baddow Wharf |
4 miles and 6¼ furlongs | 5 locks | |
| Little Baddow Lock Weir Exit Channel leading to the Weir |
4 miles and 6½ furlongs | 6 locks | |
| Church Road Footbridge | 4 miles and 7 furlongs | 6 locks | |
| Church Road Bridge (Boreham) | 5 miles and ¾ furlongs | 6 locks | |
| Paper Mill Lock Weir Entrance Channel leading to the Weir |
6 miles and ½ furlongs | 6 locks | |
| Paper Mill Lock No 7 | 6 miles and 1 furlong | 6 locks | |
| Paper Mill Lock Weir Exit Channel leading to the Weir |
6 miles and 1¼ furlongs | 7 locks | |
| North Hill Bridge | 6 miles and 1¾ furlongs | 7 locks | |
| Bumfords Lane Footbridge | 7 miles and 1¾ furlongs | 7 locks | |
| Rushes Lock Weir Entrance Channel leading to the Weir |
7 miles and 4½ furlongs | 7 locks | |
| Rushes Lock No 8 | 7 miles and 4¾ furlongs | 7 locks | |
| Rushes Lock Weir Exit Channel leading to the Weir |
7 miles and 5 furlongs | 8 locks | |
| Hoe Mill Lock Weir Entrance Channel leading to the Weir - No Access |
8 miles and 4¼ furlongs | 8 locks | |
| Hoe Mill Lock No 9 | 8 miles and 6¼ furlongs | 8 locks | |
| The Causeway Bridge | 8 miles and 6¼ furlongs | 9 locks | |
| The Causeway Bridge Winding Hole | 8 miles and 6½ furlongs | 9 locks | |
| Ulting Road Pipe Bridge | 9 miles and 1¾ furlongs | 9 locks | |
| Rickett's Lock Weir Entrance Channel leading to the Weir - No Access |
9 miles and 7¾ furlongs | 9 locks | |
| Rickett's Lock No 10 | 10 miles and 1½ furlongs | 9 locks | |
| Rickett's Lock Weir Exit Channel leading to the Weir |
10 miles and 1¾ furlongs | 10 locks | |
| Langford Pipe Bridge | 10 miles and 6 furlongs | 10 locks | |
| Beeleigh Lock Weir Entrance Channel leading to the Weir - No Access |
10 miles and 7½ furlongs | 10 locks | |
| Beeleigh Lock No 11 | 11 miles and ½ furlongs | 10 locks | |
| River Blackwater Junction | 11 miles and 1 furlong | 11 locks | |
| Beeleigh Flood Lock No 12 | 11 miles and 1¼ furlongs | 11 locks | |
| Golf Course Footbridge | 11 miles and 4¾ furlongs | 12 locks | |
| Narrows Footbridge | 11 miles and 6 furlongs | 12 locks | |
| A414 West Bridge | 11 miles and 6 furlongs | 12 locks | |
| Playground Footbridge | 11 miles and 7 furlongs | 12 locks | |
| A414 East Bridge | 12 miles and ¼ furlongs | 12 locks | |
| Holloway Road Bridge | 12 miles and 3 furlongs | 12 locks | |
| Colchester Road Pipe Bridge | 12 miles and 5¼ furlongs | 12 locks | |
| Colchester Road Bridge | 12 miles and 5½ furlongs | 12 locks | |
| Rennie Walk Footbridge | 13 miles | 12 locks | |
| Heybridge Sea Lock No 13 End of Navigation and exit to Blackwater estuary |
13 miles and 7½ furlongs | 12 locks |
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Wikipedia has a page about Chelmer and Blackwater Navigation
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.
