River Horner / Horner Water
River Horner at Bossington
Physical characteristics
 • locationnear Luccombe, Somerset, England
 • coordinates51°11′08″N 3°34′45″W / 51.18556°N 3.57917°W / 51.18556; -3.57917
MouthPorlock Bay, Bristol Channel
 • location
near Hurlestone Point, Somerset, England
 • coordinates
51°13′31″N 3°35′10″W / 51.22528°N 3.58611°W / 51.22528; -3.58611Coordinates: 51°13′31″N 3°35′10″W / 51.22528°N 3.58611°W / 51.22528; -3.58611
 • elevation
0 m (0 ft)
 • locationWest Luccombe
 • average0.46 m3/s (16 cu ft/s)
 • minimum0.02 m3/s (0.71 cu ft/s)23 August 1976
 • maximum11.3 m3/s (400 cu ft/s)18 December 1993
Basin features
 • rightRiver Aller

The River Horner, also known as Horner Water, rises near Luccombe on Exmoor, Somerset, and flows past Porlock into Porlock Bay near Hurlstone Point on the Bristol Channel.[1][2] The river flows into the sea though a shingle ridge at Bossington beach, where it forms part of the Porlock Ridge and Saltmarsh Site of Special Scientific Interest.[3] When the river level is very high, flood water builds up behind the ridge, causing it to breach.[4]


Evidence that the river was previously diverted to power iron workings has been found. The remains of an iron hammer mill and 55m long, breached, embankment dam were excavated alongside the river in 1996.[5][6]


  1. ^ "Horner Water". Somerset Rivers. Retrieved February 18, 2021.
  2. ^ "River Horner". Exmoor Waters. Retrieved February 18, 2021.
  3. ^ "Landscape Character Assessment of Exmoor" (pdf). Exmoor National Park Authority. p. 120. Retrieved February 18, 2021.
  4. ^ "Volume of water proves too much for pebble ridge". West Somerset Free Press. May 14, 2012. Retrieved February 18, 2021.
  5. ^ Naomi Cudmore (June 12, 2014). "Past Times: Horner Woods". Exmoor Magazine. Retrieved February 18, 2021.
  6. ^ "MSO7424 - Medieval and post-medieval iron working site and iron hammer mill in Horner Wood (Monument)". The Historic Environment Record for Exmoor National Park. Exmoor National Park Authority. Retrieved February 18, 2021.