|River Lugg (Afon Llugwy)|
River Lugg at Hampton Bishop
|- left||River Frome|
|- right||River Arrow|
|Settlements||Llangynllo, Presteigne, Leominster, Hope under Dinmore, Marden, Lugwardine|
|- location||Radnor Forest, Radnorshire, Powys, Wales|
|- elevation||497 m (1,631 ft)|
|- coordinates||52°21′29″N 3°12′20″W / 52.35806°N 3.20556°W|
|Mouth||confluence with River Wye|
|- location||Mordiford, Herefordshire, West Midlands, England|
|- elevation||46 m (151 ft)|
|- coordinates||52°01′52″N 2°38′10″W / 52.03111°N 2.63611°WCoordinates: 52°01′52″N 2°38′10″W / 52.03111°N 2.63611°W|
|Length||72 km (45 mi)|
The River Lugg (Welsh: Afon Llugwy) rises near Llangynllo, Powys. It flows through the border town of Presteigne, Wales then through Herefordshire, England, including the town of Leominster, south of which it is met by a tributary, the River Arrow, then to a confluence with the River Wye, which it joins at Mordiford, 9 miles (14 km) downstream of Hereford and 45 miles (72 km) from its source.
Below Leominster the river was made navigable under the River Wye & Lugg Navigation Act 1696 for improving the River Wye, and had pound locks. Despite several attempts to improve it, including making flash locks against bridges, the river was probably never a satisfactory navigation. Commercial navigation probably ceased in the early 19th century. It is still sometimes used by small boats, but can be very dangerous when in flood. The Environment Agency is the navigation authority for the river.
- I. Cohen, 'The non-tidal Wye and its navigation' Trans. Woolhope Nat. Field. Club XXXV (1955-7), 83-101
- A. Brian, '"As to the Lugg": its vanished mills, broken weirs and damaged bridges’ Ibid. XLVIII(1) (1994), 36-96.
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