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Hilfield Park Reservoir

This large expanse of water is a valuable refuge for waterfowl.

Hilfield Park Reservoir consists of a large expanse of open water surrounded by large areas of grassland, scrub, woodland and reedbeds. The private aspect of the site means that visitor numbers are very low, keeping disturbance to wildlife to a minimum and providing a rare refuge. The site is popular with wildfowl species, particularly migrating species over winter, such as wigeons, tufted duck and gadwall, as well as summer moulting species, including pochard and gadwall. The site supports the only colony of breeding black-necked grebes in the south of the country.


Pre-arranged access for HMWT Members

Hilfield Park Reservoir is a locked site. Members of Herts and Middlesex Wildlife Trust are able to arrange access by contacting the HMWT office on 01727 858901 or

Members can arrange to collect a key from Grebe House in St Albans. The key can be issued for a 24 hour period. A deposit of £10 is required.

Non-members are welcome to come along to our HMWT events held at the Reservoir – keep an eye out for what’s coming up on our events page.




Hilfield Park Reservoir is owned by Affinity Water and managed by the Herts and Middlesex Wildlife Trust.


Affinity Biodiversity Project

Hilfield Park Reservoir is one of the sites included in the Affinity Biodiversity Project. This is an exciting project funded by Affinity Water and delivered by HMWT with a goal to improve three of Affinity Water’s best sites, for both people and wildlife. These sites are Hilfield Park Reservoir, Stocker’s Lake and Springwell Reedbed. The project is using a range of approaches to reach out to people and encourage exploration and involvement in these wildlife havens, including regular nature-seeking events, volunteer opportunities, improved on-site interpretation and infrastructure, to allow the public to discover more about their wild and wonderful surroundings. Engagement with schools and local groups will also enable us to share our enthusiasm and knowledge for the nature at these reserves.


Watch this space… At Hilfield Reservoir we have big plans to improve the habitats even further for wildlife conservation, whilst at the same time improving the experience for the public. Over the next three years you will notice changes around the reserve whilst we improve various areas.


Get involved

If you are interested in volunteering at this site please click here to see if there are any volunteering opportunities coming up in the future.


Nearby nature reserves

Cassiobury Park LNR
4 miles - Herts and Middlesex Wildlife Trust
Totteridge Fields
4 miles - London Wildlife Trust
Broad Colney Lakes
5 miles - Herts and Middlesex Wildlife Trust

Nature reserve map

Reserve information

On the A41 towards Barnet
Between Bushey and Elstree
WD25 8DA
Map reference
TQ 152 959
Great for...
spring migrant birds
Best time to visit
Apr - Jul
Nov - Feb
Get directions
Find out here
Public transport
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Opening Times
Open at all times
76.30 hectares
Key required

This reserve can only be accessed through a permit.
Walking information
Large flight of steps on reservoir wall. Take care as deep water. Stout shoes required Close to Aldenham Country Park and LOOP Walk (section 15)
Park in the water company car park and ensure the gate is locked behind you.
No dogs allowed
Reserve manager
Herts & Middlesex Wildlife Trust
Tel: 01727 858901