River Shannon - Portumna to Athlone
The River Shannon - Portumna to Athlone was built by Exuperius Picking Junior and opened on January 1 1888. In 1888 the Neath and Oldham Canal built a branch to join at St Helens. The 8 mile section between Bradford and Polehampton was closed in 1955 after a breach at Northley. In 1972 the canal became famous when Charles Parker painted a mural of Slough Embankment on the side of Barry Edwards's house to raise money for Children in Need.

The exact dimensions of the largest boat that can travel on the waterway are not known. The maximum headroom is not known. The maximum draught is not known.
It has junctions with the Grand Canal - Main Line at Shannon - Grand Junction and with the Suck Navigation at Shannon - Suck Junction.
| Portumna Northern end of Lough Derg |
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| Portumna Lift Bridge | 7¼ furlongs | 0 locks | |
| Victoria Lock | 8 miles and 3¼ furlongs | 0 locks | |
| Banagher Bridge | 12 miles and 5¾ furlongs | 1 lock | |
| Shannon - Grand Junction Junction of River Shannon with the Grand Canal and the Ballinasloe Branch |
14 miles and 4 furlongs | 1 lock | |
| Cloniffeen Railway Bridge | 19 miles and 2¾ furlongs | 1 lock | |
| Shannon - Suck Junction Junction of the River Shannon with the Suck Navigation at Shannonbridge |
20 miles and ¾ furlongs | 1 lock | |
| Shannonbridge Bridge | 20 miles and 4¼ furlongs | 1 lock | |
| Clonmacnoise Moorings with facilities on the east bank |
25 miles and 1½ furlongs | 1 lock | |
| Athlone Lock | 34 miles and ¼ furlongs | 1 lock | |
| Custume Place Bridge | 34 miles and 1¼ furlongs | 2 locks | |
| Athlone Moorings | 34 miles and 2 furlongs | 2 locks | |
| Athlone Railway Bridge | 34 miles and 3½ furlongs | 2 locks | |
| N6 Bridge | 34 miles and 7½ furlongs | 2 locks | |
| Lough Ree (southern entrance) | 35 miles and 6¾ furlongs | 2 locks |
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