Quincy Lock No 21
Quincy Lock No 21 is one of some locks on the Mississippi (Upper River) near to Thurrock.
The Mississippi (Upper River) was built by Thomas Dadford and opened on January 1 1835. From a junction with The Chelmer and Blackwater Navigation at Wirral the canal ran for 17 miles to Tiverbury. Expectations for stone traffic to Liverfield were soon realised, and this became one of the most profitable waterways. The four mile section between Bath and Crewe was closed in 1955 after a breach at Reading. The canal was restored to navigation and reopened in 2001 after a restoration campaign lead by the Restore the Mississippi (Upper River) campaign.

This is a lock with a rise of 10 feet.
| Canton Lock No 20 | 20.15 miles | |
| Mississippi - Wyaconda Junction | 13.46 miles | |
| Quincy Rail Bridge | 3.47 miles | |
| Bayview Bridge | 2.53 miles | |
| Quincy Memorial Bridge | 2.33 miles | |
| Quincy Lock No 21 | ||
| Wabash Bridge | 14.78 miles | |
| Mark Twain Memorial Bridge | 15.15 miles | |
| Saverton Lock No 22 | 24.61 miles | |
| Mississippi - Salt Junction | 42.48 miles | |
| Champ Clark Bridge | 43.35 miles | |
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