Dubmill is a settlement in the civil parish of Holme St. Cuthbert in Cumbria, United Kingdom. It is located approximately one mile south-west of the village of Mawbray, half-a-mile to the west of the hamlet of Salta, three-quarters of a mile south-west of the hamlet of Hailforth, and one-and-a-half miles north of the village of Allonby. Carlisle, Cumbria's county town, lies approximately twenty-eight miles to the north-east. The B5300, known locally as the coast road, runs through Dubmill.
Dubmill lends its name to both Dubmill Point and Dubmill Scar. Dubmill Point is the name for the headland at the northernmost tip of Allonby Bay, and Dubmill Scar is the name for the rocky beach off Dubmill Point.
The area around Dubmill has been settled since before the Roman occupation, as a Bronze Age sword believed to date back to 1100BC was discovered on nearby Salta Moss. Dubmill, and the surrounding coastline from Carlisle as far south-west as Maryport, was fortified by the Romans. A series of milefortlets were placed along the coast beyond the western end of Hadrian's Wall to guard against coastal raids from across the Solway Firth. Milefortlet 17 was located at Dubmill, and would have been constructed from turf and timber. Its location has been discovered, though all that remains is a slight depression in the ground where one of the fort's ditches would have been.
A mill was present at Dubmill in the medieval period, and during the reign of Henry VIII in 1538 it was valued at £5.18s.
Dubmill is located on a stretch of coastline which was subject to raids across the Solway by the Scots even as late as the Tudor period. In 1592, a man named William Osmotherly, who lived at Dumbill, had his home broken into and was kidnapped for ransom by Scottish raiders. His losses were estimated at £200.
From November to December 2018, a public consultation called the Cumbria Coastal Strategy was held to evaluate and manage the risks related to coastal flooding and erosion along the Cumbrian coastline. The sea defences at Dubmill were assessed, and most were estimated to have between five and twenty years' life remaining. Two portions of sea defences near Dubmill were determined to have failed, including the portion opposite the Edderside road end at Oldkiln, and the rock armour north of Dubmill Point. The groynes at Dubmill were also determined to be in poor condition, and not achieving the required beach maintenance. Maintaining the beach in its current form was said to be necessary as the integrity of the concrete sea wall depends on it.
In February 2019 the B5300 coast road was closed at Dubmill due to coastal erosion. After new rock armour coastal defences were installed between Dubmill and Mawbray, the closed section of the road was able to re-open in June 2019. However, this part of the coastline is designated as being in managed retreat.
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