Much of the landscape is relatively flat – the lower reach of the Colne forming the centre of the park. Almost all the land is only 16 to 42 m (52 to 138 ft) AOD,[2] with a mixture of soils, including occasionally wet, loamy soils and clayey soils, and a small amount of naturally slightly acid heath.[3] Passing through the park is the Colne Valley Trail or Colne Valley Way, which forms a major section of the London Loop and connects to the Hertfordshire Way north of Watford.
East of the village of Denham, and west of the villages of Cowley and Harefield, and the town of Uxbridge, the Colne Valley regional park contains a mixture of farmland, woodland and water, 50 miles (80 km) of river and canal and over forty lakes, which help to regulate the flow of the major Thames tributary and provide fish for angling. The park is a regionally important place of recreation and is internationally important for wildlife. Large areas are open to the public or accessible through a network of paths.[4]
The park is threatened by the possibility of the Expansion of Heathrow Airport. The park has said "a huge area of the southern third of the Park will be lost. In addition to the new runway itself, there will be associated taxiways, hotels, car parks, warehousing, and offices."[8]
High Speed 2 will pass through the north of the park on the 2.1 miles (3.4 km) long Colne Valley Viaduct.The viaduct is designed to resemble the flight of a stone skipping across the water.[9] In October 2017, activists set up a protest camp at Harvil Road to oppose the construction.[10][11] The protesters documented alleged environmental damage by HS2 workers over an eighteen-month period, voicing concern about the destruction of wildlife habitats and the possibility that an aquifer supplying drinking water might be affected.[12] In relation to water quality HS2 has stated "Over the last six years, HS2 has worked closely with Affinity Water and the Environment Agency to monitor water quality and agree working methods.These will be monitored by a team of specialist engineers during construction in order to protect the natural environment."[9] In May 2019, the Woodland Trust called for the clearance of trees at Colne Valley to be halted while the project was under review.[12] In January 2020, HS2 began evicting the protest camps.[10] A couple living in a farmhouse on the route of the railway lost a seven-year legal battle in July 2020 and were compelled to move out after HS2 Ltd compulsory purchased their home on Dews Lane.[13] The first of the viaducts piers was cast in December 2021.[14]
The park also believes it is threatened by other proposals including motorway service stations, ‘technology parks’, Pinewood theme park and housing.[6]
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