Hilfield Park Reservoir

Hilfield Park Reservoir (c) Charlotte Hussey

Hilfield Park Reservoir

This large expanse of water is a valuable refuge for waterfowl, including blacknecked grebe.


On the A41 towards Barnet
Between Bushey and Elstree
WD25 8DA

OS Map Reference

TQ 152 959
A static map of Hilfield Park Reservoir

Know before you go

76 hectares

Entry fee


Parking information

Use Affinity Water car park and lock gate behind you.


Heavily rutted tracks with a steep climb to the top of the dam.


No dogs permitted

When to visit

Opening times

Open at all times

Best time to visit

April to July, November to February

About the reserve

This large expanse of water is a valuable refuge for waterfowl, including blacknecked grebe.
An important site for large numbers of wintering ducks, particularly mallard, shoveler, teal, wigeon and goldeneye. The area is of national importance for its summer populations of pochard, tufted duck and common tern. The marginal vegetation supports many breeding bird species such as reed bunting and sedge warbler.
Around the margins of the reservoir are large marshy areas where many species of marsh plants flourish, including great reedmace, reed canary grass, phragmites and various sedges.

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

Pre-arranged access for HMWT Members
Hilfield 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 info@hmwt.org.

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 pages.

Seasonal Highlights
 Blackcap, black-necked grebe, orange tip, reed bunting.
Summer: Brown argus, common pipistrelle, marbled white, migrant hawker, meadow brown.
Autumn/ Winter: Goldeneye, goosander, pochard, smew, wigeon.


Site entrance:The entrance is on Hilfield Lane – there is no public access. HMWT members only, borrow key from Trust.

Access by road: On A41 head south towards Edgware. Pass over M1 and turn left into Hilfield Lane after 0.5 miles. Entrance is 200 yards on the right.

Access by public transport
306, 823 bus – Motorway Bridge on A411, Eltree Road. Reserve (1 mile).
Rail: Bushey or Elstree and Borehamwood (3 miles).

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