Chalk streams are a characteristic and attractive feature of the Chilterns landscape. They are also a globally rare habitat. In fact there are only 283 chalk streams in the UK, and the UK accounts for around 85% of the global total.
Chalk streams are important habitats for wildlife and support a massive range of species. They are home to some of our most threatened plants and animals, such as the water vole and brown trout. They also have a fascinating history and supported many thriving industries in the past.
Our three films provide an excellent overview, explaining ‘What are chalk streams, and why are they special‘, How chalk streams work, and exploring the threats they face.
The nine Chilterns’ chalk streams are so important that a special partnership project has been created to conserve them. Uniting all the organisations with an interest in the streams, the Chilterns Chalk Streams Project works with local people across the Chilterns to improve river habitats, improve access and enjoyment and promote the sustainable use of water.
Find out more
Visit
There are plenty of ways to get out and enjoy the Chilterns chalk streams for yourself.
Discover
What is a chalk stream, how do they work, and what makes them so special?
Learning
School visit information and educational chalk stream resources for primary, secondary and beyond.
Chalk Streams in Crisis
Despite the rarity and value of chalk streams, these precious and unique freshwater ecosystems are at risk.
Our Work
For 25 years the Chilterns Chalk Streams Project has worked to conserve, enhance and raise awareness of this globally important habitat.
Get involved
If you love your local chalk stream then why not help look after it?
Chilterns Chalk Streams Project Annual Report
Read our latest Annual Report to find out more about the work of the Chilterns Chalk Streams Project.
Recent News
Our River’s Films
Funded by Smarter Water Catchment Project the CCSP education team have produced a series of films with local schools. Have...
Chesham Moor – Temporary footbridge closure and path diversion
Temporary footbridge closure and path diversion at junction of Bois Moor Road and Moor Road 25th to 28th November. ...
Scarp slope streams
Scarp slope streams in the north-west facing escarpment of the Chilterns have been often overlooked in the past. The Chilterns...
Events
Ewelme Watercress Beds & Local Nature Reserve
- December 2024
- 10:30
Open days and guided walk are arranged around the Ewelme...
Riverfly monitoring: Guided walk and survey of the River Bulbourne
- 12 January
- 11:00
Everyone is welcome to this event organized by the Chilterns...
Spring 2025 Riverfly Training Day
- 12 April
- 09:00
Join us for our Spring Riverfly Monitoring Training day. This...
Spring 2025 Extended Riverfly Training Day
- 1 March
- 10:00
Already confident in the Riverfly method? Join us to learn...