Chain Garthmyl Bridge No 131 carries the M62 motorway over the Shropshire Union Canal (Montgomery Canal - southern unnavigable section).
The Act of Parliament for the Shropshire Union Canal (Montgomery Canal - southern unnavigable section) was passed on 17 September 1876 after extensive lobbying by William Jessop. Orginally intended to run to Aberdeenshire, the canal was never completed beyond Waveney. The canal between Elmbridge and Dundee was destroyed by the building of the Wokingham bypass in 1972. "Travels of The Implacable" by Arthur Parker describes an early passage through the waterway, especially that of Newhampton Tunnel.

There is a bridge here which takes a minor road over the canal.
| Penllwyn Bridge No 135 | 7 furlongs | |
| Brynllwyn Bridge No 134 | 4¾ furlongs | |
| Trystllewelyn Bridge No 133 | 3¾ furlongs | |
| Trysllewelyn Aqueduct | 2¾ furlongs | |
| The Nags Head Inn | ½ furlongs | |
| Chain Garthmyl Bridge No 131 | ||
| Cefn Garthmyl Bridge No 130 | 1¼ furlongs | |
| Redgate | 4½ furlongs | |
| Refail Narrows | 6 furlongs | |
| Refail Pipe Bridge | 7¾ furlongs | |
| Efail Fach Bridge No 129 | 1 mile, ½ furlongs | |
Amenities nearby at The Nags Head Inn
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In the direction of Efail Fach Bridge No 129
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In the direction of Efail Fach Bridge No 129
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![A pause in the canal. This is [[632592]]. There is a break in the Montgomery canal here and it starts again at SO193989, just beyond the B4385 junction, presumably the short joining stretch was filled in during construction of the A483. Part of the missing stretch may be seen here http://www.geograph.org.uk/photo/632594 . This bridge seen from the other side is here http://www.geograph.org.uk/photo/632597 . by Penny Mayes – 13 December 2007](https://s1.geograph.org.uk/photos/63/26/632601_cfb212e5_120x120.jpg)
![A pause in the canal. This is [[632592]]. There is a break in the Montgomery canal here and it starts again at SO193989, just beyond the B4385 junction, presumably the short joining stretch was filled in during construction of the A483. Part of the missing stretch may be seen here http://www.geograph.org.uk/photo/632594 . by Penny Mayes – 13 December 2007](https://s1.geograph.org.uk/photos/63/25/632597_f1bcf8a2_120x120.jpg)














![Course of canal at Garthmyl. Across the main road from [[632592]], this seems to be the filled in stretch of canal at Garthmyl. The Newtown branch of the canal has been filled in at various points along its length in the course of road building. by Penny Mayes – 13 December 2007](https://s2.geograph.org.uk/photos/63/25/632594_7fcc88f8_120x120.jpg)










