New Road Bridge No 139 carries the M4 motorway over the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford).
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

There is a bridge here which takes a road over the canal.
| Tring Road Garage | 1 mile, 2¼ furlongs | |
| Dudswell Locks No 47 | 1 mile | |
| Dudswell Locks No 48 | 6½ furlongs | |
| Dudswell Lane Bridge No 138 | 6¼ furlongs | |
| Northchurch Top Lock No 49 | ¼ furlongs | |
| New Road Bridge No 139 | ||
| Bushes Lock No 50 | 3 furlongs | |
| Northchurch Bridge No 140 | 4¾ furlongs | |
| Northchurch Pipe Bridge | 4¾ furlongs | |
| Northchurch Lock No 51 | 6½ furlongs | |
| Northchurch Bottom Lock No 52 | 7¼ 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 Thames - Grand Union Canal Junction
In the direction of Gayton Junction
Nearest rubbish disposal
In the direction of Thames - Grand Union Canal Junction
In the direction of Gayton 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 Thames - Grand Union Canal Junction
In the direction of Gayton Junction
Wikipedia has a page about New Road Bridge
New Henniker Bridge or New Bridge was a covered bridge in West Hopkinton, New Hampshire, which carried Henniker Road over the Contoocook River. The truss bridge was completed in 1863, and was the second bridge on the site. The original stone arch bridge was built in 1845 and was washed away by flood in 1852. The bridge was just over 20 feet (6.1 m) wide and 180 feet (55 m) long, and consisted of a single span supported by two triple lattice trusses resting on granite abutments. The patent drawings show an all-timber truss with fixed intersection angles in the center of the span. At the ends of the span the angles of the diagonals vary. The end post is vertical, and each brace further from it is sloped a little more.
In 1935 the bridge had sustained damage during a flood and was repaired. The bridge was utilized until 1936 when a steel truss bridge was built adjoining it to the north and ready for traffic. The covered bridge was then destroyed.



![Grand Union Canal: Bridge No 139, Northchurch. Travel along the Grand Union Canal.North: [[1524807]]. You are Here.South: [[1524824]]. by Chris Reynolds – 07 October 2009](https://s1.geograph.org.uk/geophotos/01/52/48/1524817_7a4a6d1e_120x120.jpg)







![Grand Union Canal: Northchurch Top Lock No 49. Travel along the Grand Union Canal.North: [[1514970]].[[1514979]]. You are Here.South: [[1524817]]. by Chris Reynolds – 07 October 2009](https://s3.geograph.org.uk/geophotos/01/52/48/1524807_2ae011f6_120x120.jpg)


















