| River Horner / Horner Water | |
| Subdivision Type1: | Country |
| Subdivision Name1: | England |
| Subdivision Type2: | County |
| Subdivision Type3: | County |
| Subdivision Name3: | Somerset |
| Discharge1 Location: | West Luccombe |
| Discharge1 Min: | 0.02m3/s23 August 1976 |
| Discharge1 Avg: | 0.46m3/s |
| Discharge1 Max: | 11.3m3/s18 December 1993 |
| Source1 Location: | near Luccombe, Somerset, England |
| Source1 Coordinates: | 51.1856°N -3.5792°W |
| Mouth: | Porlock Bay, Bristol Channel |
| Mouth Location: | near Hurlestone Point, Somerset, England |
| Mouth Coordinates: | 51.2253°N -3.5861°W |
| Mouth Elevation: | 0m (00feet) |
| Tributaries Right: | River 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]