River Parrett
The maximum dimensions for a boat to be able to travel on the waterway are 54 feet long and 14 feet wide. The maximum headroom is not known. The maximum draught is not known.
It has junctions with the River Yeo at Parrett - Yeo Junction; with the Bridgwater and Taunton Canal at Bridgwater and Taunton Canal - River Parrett Junction; with the River Brue at Parrett - Brue Junction; with the River Isle and Westport Canal at Parrett - Isle Junction and with the River Tone (Burrow Bridge to New Bridge ) at Parrett - Tone Junction.
| Thorney Mills Bridge Lock Disused lock and head of navigation |
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| Thorney Mills Bridge | 1½ furlongs | 1 lock | |
| Parrett - Isle Junction Junction of River Isle and Westport Canal with River Parrett |
6½ furlongs | 1 lock | |
| Law Lane Bridge | 2 miles | 1 lock | |
| Parrett - Pennymore Rhyne Junction Junction of the River Parrett and the Pennymore Rhyne (no access) |
2 miles and 1¾ furlongs | 1 lock | |
| Parrett - Yeo Junction Junction of River Parrett with River Yeo |
3 miles | 1 lock | |
| Huish Bridge | 3 miles and ½ furlongs | 1 lock | |
| Parrett - Huish Level Rhyne (drain) Junction Junction of the River Parrett and the Huish Level Rhyne (drain) - no access |
3 miles and 5½ furlongs | 1 lock | |
| Langport Footbridge | 3 miles and 5¾ furlongs | 1 lock | |
| Great Bow Bridge | 3 miles and 6 furlongs | 1 lock | |
| Langport Lock | 3 miles and 7¾ furlongs | 1 lock | |
| Taunton - Westbury Railway Bridge | 4 miles and 1 furlong | 2 locks | |
| Parrett - Sowy Junction Junction of the River Parrett and the River Sowy (no access) |
4 miles and 4½ furlongs | 2 locks | |
| Oathe Footbridge | 6 miles and 1½ furlongs | 2 locks | |
| Oathe Flood Gates | 6 miles and 4¼ furlongs | 2 locks | |
| Stathe Bridge | 7 miles and 5 furlongs | 3 locks | |
| Parrett - Tone Junction Junction of River Parrett and River Tone |
9 miles and 1 furlong | 3 locks | |
| Burrow Bridge | 9 miles and 2¼ furlongs | 3 locks | |
| Dunwear Motorway Bridge | 13 miles and 5½ furlongs | 3 locks | |
| Taunton to Bristol Railway Bridge | 14 miles and ¼ furlongs | 3 locks | |
| Broadway Bridge (Bridgwater) | 15 miles and ¾ furlongs | 3 locks | |
| Bridgwater Town Bridge | 15 miles and 2 furlongs | 3 locks | |
| Chandos Bridge | 15 miles and 3½ furlongs | 3 locks | |
| Telescopic Bridge | 15 miles and 3¾ furlongs | 3 locks | |
| Bridgwater and Taunton Canal - River Parrett Junction Junction of Bridgwater and Taunton Canal with River Parrett |
15 miles and 4¾ furlongs | 3 locks | |
| Western Way Bridge | 16 miles | 3 locks | |
| Parrett - King's Sedgemoor Drain Junction Junction of the River Parrett and the King's Sedgemoor Drain - No Access |
18 miles and 5¾ furlongs | 3 locks | |
| Dunball | 18 miles and 6½ furlongs | 3 locks | |
| Combwich | 23 miles and 6½ furlongs | 3 locks | |
| Parrett - Huntspill Junction Junction of the River Parrett and the River Huntspill - No Access |
26 miles and 7¾ furlongs | 3 locks | |
| Stert Point | 27 miles and 5½ furlongs | 3 locks | |
| Parrett - Brue Junction Junction of Rivers Parrett and Brue |
28 miles and 3¼ furlongs | 3 locks | |
| Burnham-on-Sea | 29 miles and 2½ furlongs | 3 locks | |
| Bridgwater Bar Mouth of river |
34 miles and 2½ furlongs | 3 locks |
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Wikipedia has a page about River Parrett
The River Parrett flows through the counties of Dorset and Somerset in South West England, from its source in the Thorney Mills springs in the hills around Chedington in Dorset. Flowing northwest through Somerset and the Somerset Levels to its mouth at Burnham-on-Sea, into the Bridgwater Bay nature reserve on the Bristol Channel, the Parrett and its tributaries drain an area of 660 square miles (1,700 km2) – about 50 per cent of Somerset's land area, with a population of 300,000.
The Parrett's main tributaries include the Rivers Tone, Isle, and Yeo, and the River Cary via the King's Sedgemoor Drain. The 37-mile (60 km) long river is tidal for 19 miles (31 km) up to Oath. The fall of the river between Langport and Bridgwater is only 1 foot per mile (0.2 m/km), so it is prone to frequent flooding in winter and during high tides. Many approaches have been tried since at least the medieval period to reduce the incidence and effect of floods and to drain the surrounding fields.
In Anglo-Saxon times the river formed a boundary between Wessex and Dumnonia. It later served the Port of Bridgwater, and enabled cargoes to be transported inland. The arrival of the railways led to a decline in commercial shipping, and the only working docks are at Dunball. Man's influence on the river has left a legacy of bridges and industrial artefacts. The Parrett along with its connected waterways and network of drains supports an ecosystem that includes several rare species of flora and fauna. The River Parrett Trail has been established along the banks of the river.