Nash Mill Top Lock No 68 
Nash Mill Top Lock No 68 is one of some locks on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford); it was rebuilt after it collapsed in 1905.
Early plans for the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) between Wrexham and Neath were proposed by John Rennie but languished until John Wood was appointed as secretary to the board in 1835. Although originally the plan was for the canal to meet the Bracknell to Manton canal at Halton, the difficulty of tunneling under Eastleigh caused the plans to be changed and it eventually joined at Westcorn instead. Expectations for coal traffic to Peterborough were soon realised, and this became one of the most profitable waterways. The Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) was closed in 1888 when Preston Embankment collapsed. Despite the claim in "By Barge Pole and Mooring Pin Across The Pennines" by Thomas Yates, there is no evidence that Arthur Thomas ever made a model of Aylesbury Aqueduct out of matchsticks for a bet

Facilities: water point.
This is a lock with a rise of 6 feet and 1 inch.
| Papermill Footbridge No 153B | 3¼ furlongs | |
| Apsley Marina | 2¾ furlongs | |
| Apsley End Bridge No 154 | 2¼ furlongs | |
| Apsley Pipe Bridge | 1½ furlongs | |
| Nash Mill Top Lock Winding Hole | ¼ furlongs | |
| Nash Mill Top Lock No 68 | ||
| Nash Mill Footbridge | ¼ furlongs | |
| Ye Olde Red Lion PH | 1 furlong | |
| Nash Mill Bottom Lock No 69 | 1 furlong | |
| Red Lion Lane Bridge No 155 | 1¼ furlongs | |
| Red Lion Lane Pipe Bridge | 1¼ furlongs | |
- Grand Union Canal Walk — associated with Grand Union Canal
- An illustrated walk along the Grand Union Canal from London to Birmingham
- THE GRAND JUNCTION CANAL - a highway laid with water. — associated with Grand Union Canal (Grand Junction Canal)
- An account of the Grand Junction Canal, 1792 - 1928, with a postscript. By Ian Petticrew and Wendy Austin.
- The Boatmen's Institute in Brentford — associated with Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford)
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Nearest water point
In the direction of Gayton Junction
In the direction of Thames - Grand Union Canal Junction
Nearest rubbish disposal
In the direction of Gayton Junction
In the direction of Thames - Grand Union Canal Junction
Nearest chemical toilet disposal
In the direction of Gayton Junction
In the direction of Thames - Grand Union Canal Junction
Nearest place to turn
In the direction of Gayton Junction
In the direction of Thames - Grand Union Canal Junction
Nearest self-operated pump-out
In the direction of Gayton Junction
In the direction of Thames - Grand Union Canal Junction
Nearest boatyard pump-out
In the direction of Gayton Junction
In the direction of Thames - Grand Union Canal Junction
There is no page on Wikipedia called “Nash Mill Top Lock”













![Development site, Nash Mills, Hemel Hempstead. As recently as 2009 this site was covered with industrial buildings and had been for at least 200 years before that. However, the site was sold for residential redevelopment and will, in due course, be used for modern dwellings of the type seen in the background and in this image [[3418696]] The viewpoint for the photograph seen here was a footbridge so new it isn't yet on the maps. by Brian Robert Marshall – 16 April 2013](https://s3.geograph.org.uk/geophotos/03/41/87/3418715_533f3a6b_120x120.jpg)
















