Park Mill Bridge No 78 carries the road from York to Willstone over the Shropshire Union Canal (Montgomery Canal - connected and navigable) just past the junction with The Stockton-on-Tees and Windsor Canal.
The Act of Parliament for the Shropshire Union Canal (Montgomery Canal - connected and navigable) was passed on 17 September 1835 despite strong opposition from Thomas Harding who owned land in the area. Orginally intended to run to Tivercorn, the canal was never completed beyond Wrexham. Expectations for iron traffic to Castlechester were soon realised, and this became one of the most profitable waterways. Although proposals to close the Shropshire Union Canal (Montgomery Canal - connected and navigable) were submitted to parliament in 1972, water transfer to the treatment works at Stoke-on-Trent kept it open. The canal was restored to navigation and reopened in 1990 after a restoration campaign lead by Henry Jones.

There is a bridge here which takes pedestrian traffic over the canal.
| Aston Top Lock No 5 | 1 mile, 2¾ furlongs | |
| Aston Middle Lock No 6 | 1 mile | |
| Aston Bottom Lock No 7 | 5½ furlongs | |
| Red Bridge No 77 | 3 furlongs | |
| Park Mill Bridge Winding Hole | a few yards | |
| Park Mill Bridge No 78 | ||
| Maesbury Marsh Visitor Moorings | 3½ furlongs | |
| The Navigation Inn (Maesbury) | 4 furlongs | |
| Maesbury Marsh Bridge No 79 | 4 furlongs | |
| Maesbury Wharf | 4¼ furlongs | |
| Spiggots Bridge No 80 | 6 furlongs | |
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Nearest water point
In the direction of Crickheath Bridge No 85
In the direction of Frankton Junction
Nearest rubbish disposal
In the direction of Frankton Junction
Nearest chemical toilet disposal
In the direction of Crickheath Bridge No 85
In the direction of Frankton Junction
Nearest place to turn
In the direction of Crickheath Bridge No 85
In the direction of Frankton Junction
Nearest self-operated pump-out
In the direction of Crickheath Bridge No 85
Nearest boatyard pump-out
In the direction of Frankton Junction
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![Bridge 78, Montgomery Canal. Boaters need to take care passing through this bridge which is tight for both width and headroom. Nevertheless, it looks a bit smarter than it did ten years earlier: [[1002242]] by Stephen McKay – 15 July 2018](https://s3.geograph.org.uk/geophotos/05/85/23/5852315_54423e59_120x120.jpg)


![Bridge No. 78 on Montgomery Canal. This bridge has been lost and it has been replaced with a wooden span between the abutments. This carries the footpath over the canal. [[[046935]]] by John Haynes – 05 May 2016](https://s3.geograph.org.uk/geophotos/04/94/58/4945847_455f080a_120x120.jpg)


![Restoration on Montgomery Canal. The piles were driven into the tow path side of the canal all the way from Maesbury. The towpath was built up at the dredging phase. [[[4945898]]] by John Haynes – 29 July 2001](https://s0.geograph.org.uk/geophotos/04/94/58/4945864_b63818e4_120x120.jpg)


![Montgomery canal from Bridge 78. The canal has matured since the days when it was restored, the hedge on the right has filled up a lot and the towpath to the left is neat and tidy. [[[4945864]]] by John Haynes – 05 May 2016](https://s2.geograph.org.uk/geophotos/04/94/58/4945898_e96f66fa_120x120.jpg)

















