Sandford Lock No 3 is one of a long flight of locks on the Chelmer and Blackwater Navigation and is one of the deepest locks on the waterway just past the junction with The River Wear.
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.

There is a bridge here which takes a minor road over the canal.
This is a lock, the rise of which is not known.
| Barnes Mill Lock Weir Entrance | 1 mile, 1¼ furlongs | |
| Barnes Mill Lock No 2 | 1 mile, ¼ furlongs | |
| Barnes Mill Lock Weir Exit | 7¾ furlongs | |
| Sandford Lock Weir Entrance | 1¾ furlongs | |
| Sandford Mill Road Bridge | 1¼ furlongs | |
| Sandford Lock No 3 | ||
| Sandford Lock Weir Exit | 1 furlong | |
| A12 Road Bridge | 3 furlongs | |
| A12 Footbridge | 4 furlongs | |
| Cuton Lock Weir Entrance | 1 mile, ½ furlongs | |
| Cuton Lock No 4 | 1 mile, ¾ furlongs | |
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In the direction of Heybridge Sea Lock No 13
In the direction of End of Navigation (Chelmsford)
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Wikipedia has a page about Sandford Lock
Sandford Lock is a lock on the River Thames in England, situated at Sandford-on-Thames which is just south of Oxford. The first pound lock was built in 1631 by the Oxford-Burcot Commission although this has since been rebuilt. The lock has the deepest fall of all locks on the Thames at 8ft 9in (2.69m) and is connected to a large island which is one of three at this point. The lock lies at the end of Church Lane in Sandford on Thames.
Upstream from the lock, the main weir connects the second island to the opposite bank on the Kennington, Oxfordshire side. This is the location of the infamous Sandford Lasher, a treacherous weirpool where many have drowned. Another weir links the two lower islands.






























