The River Wye is a tidal river and is part of the Waterways of Mainland Britain. It runs for 15 miles from Beachley Point (where it joins the River Severn (tidal section)) to Bigsweir Bridge (beyond which it is navigable for smaller craft).
The maximum dimensions for a boat to be able to travel on the waterway are 100 feet long and 20 feet wide. The maximum headroom is not known. The maximum draught is not known.
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Junction of the River Severn and the River Wye
|Severn Road Bridge||1 mile and 1 furlong||0 locks|
|Chepstow Railway Bridge||3 miles||0 locks|
|Chepstow Town Bridge||3 miles||0 locks|
|Old Wye Bridge||3 miles and 2¼ furlongs||0 locks|
|5 miles and 1½ furlongs||0 locks|
|Tintern Bridge||10 miles and 3½ furlongs||0 locks|
|Brockweir Bridge||11 miles and 6¾ furlongs||0 locks|
|Llandogo||13 miles and 6½ furlongs||0 locks|
Normal Tidal Limit
|15 miles||0 locks|
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Wikipedia has a page about River Wye
The River Wye (Welsh: Afon Gwy) is the fifth-longest river in the UK, stretching some 215 kilometres (134 mi) from source to sea. For much of its length the river forms part of the border between England and Wales. The Wye Valley (lower part) is an Area of Outstanding Natural Beauty. The Wye is important for nature conservation and recreation.