Viaduct Pond on the Hampstead Chain has one of the most iconic views from its banks, its namesake- the Viaduct. This bridge was built between 1844 and 1847 by Sir Thomas Maryon Wilson, the then owner of part of the Heath. He wanted to develop his land into grand villas. The bridge, made of bricks from the Heath’s own brick works (located near Vale of Health) was to be part of the grand entrance to these villas. Fortunately his plans were thwarted by legislation which protected the Heath as open space.
The works on Viaduct Pond are relatively small and involved raising the dam by 200mm, creating an additional overflow pipe and creating a grass lined spillway. The pond’s water quality is currently poor and this will be improved by increased aeration, aquatic planting and de-silting. The latter, which will take place in winter 2015, will greatly improve the pond’s water quality and will benefit all aquatic life.
View a plan of Viaduct pond, including the new spillway and the environmental mitigation: Viaduct pond – environmental masterplan
Most of the works have now taken place at this location. The spillway is to to be finished off when the turf is ready in August and the path re-surfaced at the same time. A new fence is to be erected around the outfall of the new overflow pipe. This photograph of the dam was taken at Viaduct in mid-July.