Environment Agency ecology region
Hertfordshire and North London
409 survey sites hold recorded taxa in this region. Each site page lists what monitoring found and when. None of it establishes access, permission, current presence or fishing quality.
Showing 1–100 of 409
Page 1 of 5
12th T at Golf Club
- Survey events
- 3
- Observed taxa
- 4
- First survey
- 16 May 2006
- Latest survey
- 31 Oct 2018
8 Acre Plantation
- Survey events
- 2
- Observed taxa
- 9
- First survey
- 4 Nov 2003
- Latest survey
- 10 Sept 2013
Abridge
- Survey events
- 6
- Observed taxa
- 14
- First survey
- 21 Apr 1992
- Latest survey
- 6 Sept 2006
Abridge Village Hall
- Survey events
- 2
- Observed taxa
- 10
- First survey
- 16 Apr 2015
- Latest survey
- 23 Apr 2026
Albany Park
- Survey events
- 5
- Observed taxa
- 13
- First survey
- 4 Dec 2013
- Latest survey
- 21 Oct 2019
Amwell Loop
- Survey events
- 21
- Observed taxa
- 24
- First survey
- 12 Apr 1978
- Latest survey
- 15 Jul 2025
Amwell Magna
- Survey events
- 1
- Observed taxa
- 5
- First survey
- 24 Feb 1993
- Latest survey
- 24 Feb 1993
Amwell Quarry
- Survey events
- 1
- Observed taxa
- 6
- First survey
- 1 Oct 1992
- Latest survey
- 1 Oct 1992
Arnos Park
- Survey events
- 3
- Observed taxa
- 4
- First survey
- 6 Apr 2012
- Latest survey
- 8 Apr 2026
At Brook House
- Survey events
- 3
- Observed taxa
- 10
- First survey
- 7 May 2008
- Latest survey
- 23 Apr 2024
Aythorpe Roding
- Survey events
- 6
- Observed taxa
- 9
- First survey
- 11 Mar 1993
- Latest survey
- 28 Sept 2007
Bank Mill Lane
- Survey events
- 1
- Observed taxa
- 1
- First survey
- 18 Oct 2016
- Latest survey
- 18 Oct 2016
Bankside
- Survey events
- 1
- Observed taxa
- 5
- First survey
- 3 Jun 1987
- Latest survey
- 3 Jun 1987
Bansons Lane
- Survey events
- 16
- Observed taxa
- 13
- First survey
- 16 Apr 1993
- Latest survey
- 16 Jul 2024
Barking Creek - A13 road bridge
- Survey events
- 1
- Observed taxa
- 5
- First survey
- 13 Jul 1993
- Latest survey
- 13 Jul 1993
Barking Creek - Mayes Brook confluence
- Survey events
- 1
- Observed taxa
- 11
- First survey
- 30 Jul 1993
- Latest survey
- 30 Jul 1993
Barking Creek - Six gates pool
- Survey events
- 1
- Observed taxa
- 3
- First survey
- 13 Jul 1993
- Latest survey
- 13 Jul 1993
Barking Creek - Six gates pool L/H D/S
- Survey events
- 1
- Observed taxa
- 3
- First survey
- 13 Jul 1993
- Latest survey
- 13 Jul 1993
Barking Creek - Six gates sluice to Bark. slipway
- Survey events
- 1
- Observed taxa
- 3
- First survey
- 1 Jul 1993
- Latest survey
- 1 Jul 1993
Barwick Ford
- Survey events
- 6
- Observed taxa
- 11
- First survey
- 23 Oct 2003
- Latest survey
- 5 Sept 2024
Batford
- Survey events
- 2
- Observed taxa
- 5
- First survey
- 16 Apr 2008
- Latest survey
- 19 Jun 2014
Bayford
- Survey events
- 4
- Observed taxa
- 12
- First survey
- 7 Nov 2003
- Latest survey
- 27 Oct 2006
Bayford Pond Waterhall
- Survey events
- 1
- Observed taxa
- 1
- First survey
- 14 Feb 2017
- Latest survey
- 14 Feb 2017
Beasley's Ait Lane
- Survey events
- 1
- Observed taxa
- 1
- First survey
- 14 Jul 2011
- Latest survey
- 14 Jul 2011
Bengeo Hall
- Survey events
- 13
- Observed taxa
- 17
- First survey
- 30 Oct 2003
- Latest survey
- 28 Aug 2025
Berkhamsted
- Survey events
- 2
- Observed taxa
- 8
- First survey
- 31 Mar 1987
- Latest survey
- 4 Apr 1987
Blakesware Estate
- Survey events
- 1
- Observed taxa
- 7
- First survey
- 13 Oct 2003
- Latest survey
- 13 Oct 2003
Blakesware estate enhancement downstream
- Survey events
- 2
- Observed taxa
- 7
- First survey
- 4 Mar 2003
- Latest survey
- 7 Jun 2005
Blakesware estate enhancement upstream
- Survey events
- 2
- Observed taxa
- 4
- First survey
- 3 Mar 2003
- Latest survey
- 7 Jun 2005
Bois Mill
- Survey events
- 1
- Observed taxa
- 3
- First survey
- 23 Oct 2012
- Latest survey
- 23 Oct 2012
Boston Manor Park (Brent/GUC)
- Survey events
- 1
- Observed taxa
- 7
- First survey
- 3 Nov 1994
- Latest survey
- 3 Nov 1994
Boxmoor d/s
- Survey events
- 5
- Observed taxa
- 9
- First survey
- 24 Apr 2015
- Latest survey
- 14 May 2019
Boxmoor u/s
- Survey events
- 6
- Observed taxa
- 10
- First survey
- 24 Apr 2015
- Latest survey
- 14 May 2019
Brent Meadows
- Survey events
- 1
- Observed taxa
- 2
- First survey
- 19 Oct 1994
- Latest survey
- 19 Oct 1994
Bretons
- Survey events
- 5
- Observed taxa
- 14
- First survey
- 14 May 1996
- Latest survey
- 26 Oct 2018
Briggens Park
- Survey events
- 11
- Observed taxa
- 15
- First survey
- 15 Oct 2003
- Latest survey
- 10 Sept 2019
British Aerospace Sportsground (Bragbury End)
- Survey events
- 1
- Observed taxa
- 1
- First survey
- 26 Oct 1993
- Latest survey
- 26 Oct 1993
British Fresian Society
- Survey events
- 1
- Observed taxa
- 6
- First survey
- 4 Dec 1987
- Latest survey
- 4 Dec 1987
Broadhall Way
- Survey events
- 3
- Observed taxa
- 1
- First survey
- 10 Apr 2012
- Latest survey
- 9 Apr 2026
Brook Road
- Survey events
- 1
- Observed taxa
- 1
- First survey
- 13 Sept 1994
- Latest survey
- 13 Sept 1994
Broxbourne Mill Stream
- Survey events
- 1
- Observed taxa
- 6
- First survey
- 8 Oct 1992
- Latest survey
- 8 Oct 1992
Bullsmill
- Survey events
- 1
- Observed taxa
- 2
- First survey
- 21 Oct 1993
- Latest survey
- 21 Oct 1993
Bush hall
- Survey events
- 1
- Observed taxa
- 8
- First survey
- 27 Nov 2007
- Latest survey
- 27 Nov 2007
Carthagena Fisheries
- Survey events
- 13
- Observed taxa
- 16
- First survey
- 15 Oct 1992
- Latest survey
- 17 Jul 2017
Cassiobury Park
- Survey events
- 11
- Observed taxa
- 18
- First survey
- 3 Oct 2000
- Latest survey
- 23 Apr 2013
Cassiobury Park u/s Lock
- Survey events
- 1
- Observed taxa
- 8
- First survey
- 9 Mar 1988
- Latest survey
- 9 Mar 1988
Chandlers End, Mill Farm
- Survey events
- 5
- Observed taxa
- 6
- First survey
- 16 Oct 2003
- Latest survey
- 8 May 2024
Chenies Bottom Bypass Channel
- Survey events
- 1
- Observed taxa
- 1
- First survey
- 16 May 2013
- Latest survey
- 16 May 2013
Chingdale Road
- Survey events
- 3
- Observed taxa
- 2
- First survey
- 5 Apr 2011
- Latest survey
- 20 Apr 2026
Church Lane, Stapleford
- Survey events
- 6
- Observed taxa
- 6
- First survey
- 23 Sept 1993
- Latest survey
- 13 Apr 2026
Cobbinsend Road Mitigation site
- Survey events
- 1
- Observed taxa
- 1
- First survey
- 4 Nov 2010
- Latest survey
- 4 Nov 2010
Cockabourne Bridge
- Survey events
- 2
- Observed taxa
- 9
- First survey
- 5 Jul 1996
- Latest survey
- 25 May 2012
Codicote Station 1
- Survey events
- 7
- Observed taxa
- 3
- First survey
- 11 Jul 2017
- Latest survey
- 4 Apr 2023
Codicote Station 2
- Survey events
- 4
- Observed taxa
- 5
- First survey
- 11 Jul 2017
- Latest survey
- 6 Feb 2019
Codicote bottom farm
- Survey events
- 1
- Observed taxa
- 5
- First survey
- 14 Jun 2006
- Latest survey
- 14 Jun 2006
Codicote restoration d/s
- Survey events
- 1
- Observed taxa
- 3
- First survey
- 1 Mar 2007
- Latest survey
- 1 Mar 2007
Codicote restoration middle fixed effort
- Survey events
- 1
- Observed taxa
- 4
- First survey
- 28 Feb 2007
- Latest survey
- 28 Feb 2007
Codicote restoration middle fully quant
- Survey events
- 3
- Observed taxa
- 5
- First survey
- 28 Feb 2007
- Latest survey
- 26 Sept 2024
Codicote restoration u/s
- Survey events
- 2
- Observed taxa
- 5
- First survey
- 27 Feb 2007
- Latest survey
- 6 Oct 2012
Cole Green Way Farm
- Survey events
- 1
- Observed taxa
- 7
- First survey
- 14 Oct 2003
- Latest survey
- 14 Oct 2003
Colney Heath
- Survey events
- 3
- Observed taxa
- 6
- First survey
- 27 Mar 2013
- Latest survey
- 16 Apr 2026
Coppermill Lane, Rickmansworth
- Survey events
- 1
- Observed taxa
- 6
- First survey
- 18 Mar 1988
- Latest survey
- 18 Mar 1988
Coppermill Stream
- Survey events
- 1
- Observed taxa
- 2
- First survey
- 3 Nov 1992
- Latest survey
- 3 Nov 1992
Copthall Road Foot Bridge
- Survey events
- 2
- Observed taxa
- 8
- First survey
- 17 May 2006
- Latest survey
- 16 May 2011
Cornmill Meadows 3 (Mile Nursery)
- Survey events
- 14
- Observed taxa
- 25
- First survey
- 17 Dec 2004
- Latest survey
- 8 May 2025
Cornmill Meadows restoration
- Survey events
- 1
- Observed taxa
- 6
- First survey
- 10 Apr 2014
- Latest survey
- 10 Apr 2014
County Hall
- Survey events
- 1
- Observed taxa
- 3
- First survey
- 22 Mar 2012
- Latest survey
- 22 Mar 2012
Cowley, Old Mill Lane
- Survey events
- 1
- Observed taxa
- 6
- First survey
- 19 May 2009
- Latest survey
- 19 May 2009
Crane Park
- Survey events
- 10
- Observed taxa
- 14
- First survey
- 9 May 2000
- Latest survey
- 27 Sept 2022
Cranford Park
- Survey events
- 10
- Observed taxa
- 8
- First survey
- 6 Jun 2000
- Latest survey
- 14 Sept 2022
Cricketfield Lane
- Survey events
- 1
- Observed taxa
- 5
- First survey
- 16 May 1986
- Latest survey
- 16 May 1986
Crown Fishery (Dobb's Lock + Carthagena)
- Survey events
- 1
- Observed taxa
- 8
- First survey
- 5 Feb 1993
- Latest survey
- 5 Feb 1993
Crowther Nurseries
- Survey events
- 16
- Observed taxa
- 16
- First survey
- 3 May 1992
- Latest survey
- 2 Jul 2024
Cura Fisheries
- Survey events
- 9
- Observed taxa
- 18
- First survey
- 23 Jul 2004
- Latest survey
- 25 Apr 2024
D/S Cecil Saw Mills
- Survey events
- 1
- Observed taxa
- 11
- First survey
- 15 Mar 1978
- Latest survey
- 15 Mar 1978
D/S Cedar Close
- Survey events
- 1
- Observed taxa
- 3
- First survey
- 4 Oct 2018
- Latest survey
- 4 Oct 2018
D/S Luton Lane
- Survey events
- 2
- Observed taxa
- 2
- First survey
- 12 Oct 1995
- Latest survey
- 19 May 2004
D/S Redbournbury Mill
- Survey events
- 1
- Observed taxa
- 1
- First survey
- 31 Oct 1996
- Latest survey
- 31 Oct 1996
D/S Sopwell mill
- Survey events
- 1
- Observed taxa
- 5
- First survey
- 13 Jul 2006
- Latest survey
- 13 Jul 2006
D/S weirpool WDMSC
- Survey events
- 1
- Observed taxa
- 7
- First survey
- 3 Jul 2012
- Latest survey
- 3 Jul 2012
Dacorum College
- Survey events
- 1
- Observed taxa
- 4
- First survey
- 21 Feb 2002
- Latest survey
- 21 Feb 2002
David Stoker - Holyfield Weir
- Survey events
- 1
- Observed taxa
- 6
- First survey
- 16 Apr 2009
- Latest survey
- 16 Apr 2009
Denham
- Survey events
- 11
- Observed taxa
- 20
- First survey
- 20 Oct 1998
- Latest survey
- 16 Jul 2015
Denham 2.0
- Survey events
- 1
- Observed taxa
- 6
- First survey
- 19 Jul 2018
- Latest survey
- 19 Jul 2018
Denham Country Park
- Survey events
- 1
- Observed taxa
- 9
- First survey
- 9 May 2011
- Latest survey
- 9 May 2011
Denham Country Park
- Survey events
- 3
- Observed taxa
- 9
- First survey
- 6 May 1999
- Latest survey
- 7 Nov 2000
Denham Country Park upstream
- Survey events
- 2
- Observed taxa
- 6
- First survey
- 7 Jun 2019
- Latest survey
- 12 May 2026
Denham Court
- Survey events
- 1
- Observed taxa
- 8
- First survey
- 19 Feb 1986
- Latest survey
- 19 Feb 1986
Dobbs Weir
- Survey events
- 3
- Observed taxa
- 10
- First survey
- 12 Oct 2007
- Latest survey
- 22 Jun 2015
Doctors Meadow
- Survey events
- 1
- Observed taxa
- 1
- First survey
- 14 May 1999
- Latest survey
- 14 May 1999
Dollis Brook Lower
- Survey events
- 1
- Observed taxa
- 1
- First survey
- 18 Sept 2024
- Latest survey
- 18 Sept 2024
Dollis brook upper
- Survey events
- 1
- Observed taxa
- 1
- First survey
- 18 Sept 2024
- Latest survey
- 18 Sept 2024
Downstream Sheering Mill Lock
- Survey events
- 1
- Observed taxa
- 7
- First survey
- 19 Apr 2011
- Latest survey
- 19 Apr 2011
Downstream of Shardeloes Lake
- Survey events
- 3
- Observed taxa
- 7
- First survey
- 13 May 2011
- Latest survey
- 5 May 2026
Drop Lane
- Survey events
- 12
- Observed taxa
- 13
- First survey
- 8 Jul 2003
- Latest survey
- 23 May 2023
Drop lane (ver)
- Survey events
- 1
- Observed taxa
- 8
- First survey
- 7 Jun 2006
- Latest survey
- 7 Jun 2006
Duck Trap Wood
- Survey events
- 5
- Observed taxa
- 5
- First survey
- 10 May 2006
- Latest survey
- 30 Aug 2024
Easeneye Weir Removal
- Survey events
- 1
- Observed taxa
- 7
- First survey
- 23 Oct 2007
- Latest survey
- 23 Oct 2007
East Hyde D/S sewage treatment works
- Survey events
- 1
- Observed taxa
- 3
- First survey
- 22 Feb 1978
- Latest survey
- 22 Feb 1978
Eastminster School
- Survey events
- 4
- Observed taxa
- 5
- First survey
- 30 May 1996
- Latest survey
- 27 Jun 2018
Provenance
Source and licence
- SourceEnvironment Agency Ecology & Fish Data
- LicenceOpen Government Licence v3.0
- Source copy retrieved23 Jul 2026
- Terms checked23 Jul 2026
- Not assertedAccess, permission, current presence, fishing quality or safety