What is "scammonden"

Scammonden or Dean Head was a village close to Huddersfield, in the Dean Head Valley, England, before the valley was flooded to create Scammonden Reservoir in the 1960s. The M62 motorway crosses the dam wall and then passes through a cutting to the west over which Scammonden Bridge carries a B-road. The Chapel of St Barthelomew still exists, as does the old vicarage, now a boat club.