The Wetland Bird Survey (WeBS) is organised nationally by the British Trust for Ornithology and supported by the WWT, RSPB and JNCC. Its principle aims are to identify population sizes, determine trends in numbers and distribution and to identify important sites for waterbirds across the UK.

In 2017 the Hertfordshire counts were organised by Cath Patrick (Lee Valley from Ware south) and Jim Terry (all other sites) and were undertaken by dedicated observers each month. Some sites are not surveyed during the summer months (April to August) but otherwise coverage is most comprehensive.

In 2017 the core count were the following Sundays: 15 Jan, 12 Feb, 12 Mar, 9 Apr, 14 May, 11 Jun, 23 Jul, 13 Aug, 10 Sep, 8 Oct, 19 Nov, 10 Dec. The scheme organisers have agreed that the Lee Valley counts can be undertaken the previous Saturday, and some counts were carried out on the previous or subsequent weekends.

Sincere thanks are due to everyone who contributes to this important monitoring project and especially to Cath and Jim for their co-ordination.

We are always looking for volunteers to assist with this national monitoring effort both to fill any gaps in the existing coverage but also to take on other sites which could hold significant numbers of waterfowl. The effort involves counting all such species at one wetland site each month on Saturday or Sunday. This should ideally happen every month but most importantly from January to March and September to December inclusive. Please contact Jim Terry (46, Manor Way, Borehamwood, Herts, WD6 1QY) or Cath Patrick (c/o LVRP, Myddleton House, Bullís Cross, Enfield, EN2, 9HG) if you are able to help. Thank you.


Mute SwanTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 2 nc nc nc nc nc nc nc nc 
Batchworth Lake 0 0 0 2 nc nc nc nc nc 1 0 0 
Stocker's and Bury Lakes 46 42 22 22 16 23 17 23 15 20 19 18 
Maple Lodge NR 0 2 2 2 2 2 0 0 0 0 0 0 
Lynsters Lake 12 1 2 3 nc 1 2 2 10 nc 9 14 
Pynesfield North/South Lakes 2 0 1 3 2 3 2 9 9 6 9 9 
Helicon Lake 2 2 1 1 1 1 2 0 1 4 3 2 
Troy Mill Lake 39 29 24 17 4 6 4 2 22 32 32 40 
Lea Valley: 
East Hyde 0 2 6 2 4 2 8 10 2 2 2 2 
Brocket Park 3 0 2 2 2 2 2 3 2 4 2 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 3 nc nc nc nc nc nc 2 2 nc 
Amwell NR - others 7 7 1 nc 4 4 4 13 9 4 4 6 
Stanstead Abbotts Lakes - N lake 3 4 2 2 2 0 1 9 9 12 8 5 
Rye Meads 3 2 2 nc nc nc nc nc 60 45 5 5 
Broxbourne GP 7 8 6 6 6 4 4 4 5 3 4 4 
Cheshunt GPs: 
Radwell Mill nc 11 9 9 nc 11 nc nc 10 15 16 16 
Panshanger Park 1 3 0 nc nc nc nc nc nc 5 4 2 
Fairlands Valley Park 3 3 4 3 4 8 8 nc 4 3 2 4 
Verulamium Park 10 5 2 5 2 2 2 2 4 9 3 3 
Tyttenhanger GPs - all 2 0 4 nc Present 3 6 6 6 5 12 15 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 5 0 0 2 7 13 14 12 8 8 5 3 
Tring Reservoirs 25 nc 8 15 16 31 40 40 60 nc 8 nc 

Canada GooseTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 13 nc nc nc nc nc nc nc nc 
Batchworth Lake 3 21 20 28 nc nc nc nc nc 0 1 0 
Stocker's and Bury Lakes 24 80 34 70 64 67 120 52 191 9 76 21 
Maple Lodge NR 0 0 2 2 0 0 0 2 0 0 0 0 
Lynsters Lake 3 62 17 3 nc 0 52 0 2 nc 105 121 
Pynesfield North/South Lakes 0 0 0 5 0 0 11 0 0 0 0 0 
Helicon Lake 42 0 1 0 0 0 10 30 13 0 2 0 
Troy Mill Lake 1 1 0 1 6 0 4 0 1 0 2 0 
Lea Valley: 
East Hyde 3 128 94 59 66 66 48 35 100 143 78 177 
Brocket Park 22 0 14 2 1 0 0 1 1 13 9 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 4 nc nc nc nc nc nc 0 0 nc 
Amwell NR - others 62 19 39 nc 46 91 33 85 322 6 65 8 
Stanstead Abbotts Lakes - N lake 1 65 35 21 23 16 6 55 7 6 13 0 
Rye Meads 1 20 29 nc nc nc nc nc 0 0 1 0 
Broxbourne GP 0 1 6 7 2 0 5 0 0 0 0 0 
Cheshunt GPs: 
Radwell Mill nc 2 20 9 nc 13 nc nc 1 1 1 1 
Panshanger Park 2 10 18 nc nc nc nc nc nc 0 0 6 
Fairlands Valley Park 89 61 91 104 92 292 306 nc 53 9 35 34 
Verulamium Park 55 60 76 21 58 27 43 71 149 53 59 50 
Tyttenhanger GPs - all 42 111 49 nc Present 61 75 175 350 12 2 0 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 0 2 2 7 10 117 60 0 3 0 0 0 
Tring Reservoirs 17 nc 27 29 13 45 42 16 82 nc 2 nc 

WigeonTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 0 nc nc nc nc nc nc nc nc 
Batchworth Lake 0 0 0 0 nc nc nc nc nc 0 0 0 
Stocker's and Bury Lakes 98 54 2 0 0 0 0 0 0 5 0 2 
Maple Lodge NR 0 0 0 0 0 0 0 3 0 0 0 0 
Lynsters Lake 72 18 0 0 nc 0 0 0 0 nc 0 10 
Pynesfield North/South Lakes 0 0 0 0 0 0 0 0 0 2 8 41 
Helicon Lake 0 2 0 0 0 0 0 0 0 0 0 2 
Troy Mill Lake 0 0 0 0 0 0 0 0 2 72 172 40 
Lea Valley: 
East Hyde 0 0 0 0 0 0 0 0 0 0 0 0 
Brocket Park 0 0 0 0 0 0 0 0 0 0 0 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 0 nc nc nc nc nc nc 0 0 nc 
Amwell NR - others 32 52 68 nc 0 0 0 0 0 6 33 99 
Stanstead Abbotts Lakes - N lake 0 0 0 0 0 0 0 0 4 0 0 0 
Rye Meads 0 0 0 nc nc nc nc nc 4 5 1 3 
Broxbourne GP 0 0 0 0 0 0 0 0 0 0 0 0 
Cheshunt GPs: 
Radwell Mill nc 0 0 0 nc 0 nc nc 0 0 0 0 
Panshanger Park 2 1 1 nc nc nc nc nc nc 24 44 25 
Fairlands Valley Park 0 0 0 0 0 0 0 nc 0 0 0 0 
Verulamium Park 0 0 0 0 0 0 0 0 0 0 0 0 
Tyttenhanger GPs - all 0 0 0 nc 0 0 0 0 0 0 0 2 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 3 0 0 0 0 0 0 0 6 3 0 3 
Tring Reservoirs 101 nc 27 1 0 0 0 0 8 nc 62 nc 

GadwallTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 4 nc nc nc nc nc nc nc nc 
Batchworth Lake 0 0 0 0 nc nc nc nc nc 0 0 0 
Stocker's and Bury Lakes 86 31 4 3 2 3 12 16 5 31 11 27 
Maple Lodge NR 0 4 2 5 7 15 12 5 1 8 0 0 
Lynsters Lake 47 18 5 1 nc 0 0 0 6 nc 22 7 
Pynesfield North/South Lakes 15 0 0 0 0 0 0 3 11 15 22 2 
Helicon Lake 20 38 1 0 0 0 0 0 0 0 0 6 
Troy Mill Lake 17 3 0 0 0 0 15 3 49 18 58 8 
Lea Valley: 
East Hyde 43 0 2 2 0 0 0 0 0 12 11 17 
Brocket Park 0 0 0 0 0 0 0 0 0 11 36 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 6 nc nc nc nc nc nc 6 0 nc 
Amwell NR - others 45 8 17 nc 7 15 25 4 33 64 27 99 
Stanstead Abbotts Lakes - N lake 36 25 21 8 7 8 59 78 58 37 40 24 
Rye Meads 97 109 145 nc nc nc nc nc 259 145 52 64 
Broxbourne GP 58 40 35 9 0 0 0 0 2 10 0 26 
Cheshunt GPs: 
Radwell Mill nc 3 9 5 nc 0 nc nc 0 0 8 0 
Panshanger Park 171 171 52 nc nc nc nc nc nc 128 144 128 
Fairlands Valley Park 0 0 0 0 0 0 0 nc 0 0 0 0 
Verulamium Park 0 4 0 4 0 0 0 19 27 18 0 0 
Tyttenhanger GPs - all 5 3 20 nc Present 7 75 50 65 39 60 40 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 16 13 0 8 5 57 86 16 13 20 23 7 
Tring Reservoirs 65 nc 41 32 20 18 41 37 32 nc 9 nc 

TealTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 0 nc nc nc nc nc nc nc nc 
Batchworth Lake 0 0 0 0 nc nc nc nc nc 0 0 0 
Stocker's and Bury Lakes 0 0 1 0 0 0 0 0 0 0 0 0 
Maple Lodge NR 18 6 3 2 0 0 8 0 5 8 26 7 
Lynsters Lake 0 0 0 0 nc 0 0 0 0 nc 0 0 
Pynesfield North/South Lakes 0 0 0 0 0 0 0 0 0 0 0 0 
Helicon Lake 0 0 0 0 0 0 0 0 0 0 0 0 
Troy Mill Lake 0 0 0 0 0 0 0 0 0 0 0 0 
Lea Valley: 
East Hyde 11 0 1 0 0 0 0 0 0 2 0 1 
Brocket Park 0 0 0 0 0 0 0 0 0 0 0 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 2 nc nc nc nc nc nc 0 2 nc 
Amwell NR - others 8 11 0 nc 0 0 0 0 0 2 1 12 
Stanstead Abbotts Lakes - N lake 2 21 12 0 0 0 0 0 0 1 0 0 
Rye Meads 35 33 82 nc nc nc nc nc 59 53 77 101 
Broxbourne GP 0 0 0 0 0 0 0 0 0 0 0 0 
Cheshunt GPs: 
Radwell Mill nc 0 0 0 nc 0 nc nc 0 0 0 0 
Panshanger Park 14 30 18 nc nc nc nc nc nc 26 78 100 
Fairlands Valley Park 0 0 0 0 0 0 0 nc 0 0 0 0 
Verulamium Park 0 0 0 0 0 0 0 0 0 0 0 0 
Tyttenhanger GPs - all 2 20 39 nc 0 0 0 2 4 17 44 40 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 0 0 2 4 0 0 0 0 1 0 0 2 
Tring Reservoirs 247 nc 38 5 0 0 5 23 187 nc 209 nc 

MallardTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 28 nc nc nc nc nc nc nc nc 
Batchworth Lake 27 25 17 19 nc nc nc nc nc 10 13 9 
Stocker's and Bury Lakes 45 39 73 49 32 43 31 37 52 61 28 35 
Maple Lodge NR 25 16 19 17 17 43 29 58 42 15 8 5 
Lynsters Lake 16 4 17 18 nc 2 5 0 28 nc 12 6 
Pynesfield North/South Lakes 0 6 5 4 5 3 5 2 2 5 4 0 
Helicon Lake 28 6 5 2 9 0 3 7 17 27 22 0 
Troy Mill Lake 3 4 5 0 11 13 16 7 3 5 6 5 
Lea Valley: 
East Hyde 52 22 22 15 14 16 12 17 21 21 11 17 
Brocket Park 9 10 8 9 6 9 20 15 19 14 7 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 8 nc nc nc nc nc nc 43 12 nc 
Amwell NR - others 42 26 24 nc 25 13 77 25 29 12 23 90 
Stanstead Abbotts Lakes - N lake 26 16 23 6 14 24 57 30 14 16 10 14 
Rye Meads 92 80 85 nc nc nc nc nc 110 69 41 124 
Broxbourne GP 28 12 12 16 6 5 36 4 20 14 23 13 
Cheshunt GPs: 
Radwell Mill nc 71 12 32 nc 32 nc nc 23 73 74 90 
Panshanger Park 113 120 72 nc nc nc nc nc nc 22 97 84 
Fairlands Valley Park 217 193 175 74 90 131 202 nc 192 201 142 154 
Verulamium Park 28 12 13 14 0 13 19 32 29 7 17 34 
Tyttenhanger GPs - all 145 70 45 nc Present 48 105 30 52 56 35 25 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 4 7 1 14 7 18 8 4 9 5 17 10 
Tring Reservoirs 93 nc 76 91 87 76 397 301 283 nc 148 nc 

ShovelerTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 2 nc nc nc nc nc nc nc nc 
Batchworth Lake 0 0 0 0 nc nc nc nc nc 0 0 2 
Stocker's and Bury Lakes 221 105 22 3 0 0 1 14 22 53 68 54 
Maple Lodge NR 0 0 3 3 2 2 6 3 12 9 12 11 
Lynsters Lake 0 0 0 0 nc 0 0 0 0 nc 0 0 
Pynesfield North/South Lakes 0 0 0 0 0 0 0 0 0 0 0 0 
Helicon Lake 0 0 0 0 0 0 0 0 0 0 0 0 
Troy Mill Lake 2 0 0 0 0 0 0 0 0 0 6 0 
Lea Valley: 
East Hyde 0 0 0 0 0 0 0 0 0 0 0 0 
Brocket Park 0 0 0 0 0 0 0 0 0 0 0 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 0 nc nc nc nc nc nc 12 17 nc 
Amwell NR - others 14 26 24 nc 1 1 1 0 16 7 5 10 
Stanstead Abbotts Lakes - N lake 37 53 6 0 0 0 0 0 1 7 3 10 
Rye Meads 22 26 143 nc nc nc nc nc 110 41 57 31 
Broxbourne GP 6 0 0 0 0 0 0 6 0 7 0 2 
Cheshunt GPs: 
Radwell Mill nc 0 0 0 nc 0 nc nc 0 0 4 2 
Panshanger Park 6 8 2 nc nc nc nc nc nc 0 12 18 
Fairlands Valley Park 0 0 0 0 0 0 1 nc 0 1 0 0 
Verulamium Park 0 6 0 0 0 0 0 0 0 4 5 5 
Tyttenhanger GPs - all 38 10 43 nc 0 0 0 0 2 6 16 32 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 8 76 20 12 0 0 0 0 25 29 24 48 
Tring Reservoirs 65 nc 58 6 0 0 5 16 141 nc 53 nc 

PochardTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 0 nc nc nc nc nc nc nc nc 
Batchworth Lake 8 16 0 0 nc nc nc nc nc 0 4 1 
Stocker's and Bury Lakes 40 64 26 22 23 33 14 12 26 40 16 8 
Maple Lodge NR 0 10 13 13 7 1 5 4 2 1 0 0 
Lynsters Lake 10 2 1 1 nc 0 0 0 13 nc 1 0 
Pynesfield North/South Lakes 5 17 0 1 0 0 0 0 0 4 5 0 
Helicon Lake 1 1 1 0 0 0 0 0 0 0 0 3 
Troy Mill Lake 4 9 0 2 11 3 4 0 0 0 0 3 
Lea Valley: 
East Hyde 0 0 0 0 0 0 0 0 0 0 0 0 
Brocket Park 0 0 0 0 0 0 0 0 0 0 0 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 7 nc nc nc nc nc nc 3 9 nc 
Amwell NR - others 25 9 4 nc 8 5 6 11 42 23 18 20 
Stanstead Abbotts Lakes - N lake 16 17 10 5 5 1 1 7 9 13 6 8 
Rye Meads 0 8 26 nc nc nc nc nc 0 0 0 3 
Broxbourne GP 0 0 1 0 0 0 0 0 0 0 4 12 
Cheshunt GPs: 
Radwell Mill nc 0 0 0 nc 0 nc nc 0 0 0 0 
Panshanger Park 13 12 4 nc nc nc nc nc nc 3 6 13 
Fairlands Valley Park 0 0 0 0 0 0 0 nc 0 0 0 0 
Verulamium Park 0 4 0 5 1 0 0 0 0 1 2 0 
Tyttenhanger GPs - all 4 3 8 nc 0 0 2 0 2 2 2 6 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 23 6 0 5 0 67 166 43 4 4 5 28 
Tring Reservoirs 83 nc 16 1 3 6 21 48 105 nc 99 nc 

Tufted DuckTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 8 nc nc nc nc nc nc nc nc 
Batchworth Lake 10 23 14 9 nc nc nc nc nc 9 7 5 
Stocker's and Bury Lakes 95 85 192 59 23 54 52 85 21 77 55 110 
Maple Lodge NR 5 6 25 25 9 4 8 5 3 4 3 0 
Lynsters Lake 30 45 25 27 nc 0 2 5 15 nc 30 7 
Pynesfield North/South Lakes 23 36 20 11 0 0 0 1 0 10 27 1 
Helicon Lake 30 25 16 14 8 3 5 0 2 8 21 40 
Troy Mill Lake 200 87 110 0 14 14 18 1 0 174 40 3 
Lea Valley: 
East Hyde 0 0 0 0 4 0 0 0 0 2 0 4 
Brocket Park 9 0 0 6 2 18 2 4 5 1 6 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 71 nc nc nc nc nc nc 72 21 nc 
Amwell NR - others 76 34 86 nc 35 43 14 16 74 38 59 0 
Stanstead Abbotts Lakes - N lake 52 74 68 21 51 23 48 77 141 146 151 114 
Rye Meads 55 50 81 nc nc nc nc nc 50 23 22 21 
Broxbourne GP 143 158 56 50 1 6 117 112 32 81 27 102 
Cheshunt GPs: 
Radwell Mill nc 0 0 0 nc 1 nc nc 0 0 0 0 
Panshanger Park 41 32 51 nc nc nc nc nc nc 24 35 34 
Fairlands Valley Park 3 0 0 2 0 0 0 nc 0 1 0 0 
Verulamium Park 2 6 10 18 9 12 3 0 0 1 2 0 
Tyttenhanger GPs - all 15 13 30 nc Present 6 21 12 3 8 12 20 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 72 83 20 105 14 21 124 176 71 76 80 83 
Tring Reservoirs 272 nc 281 234 47 63 160 262 316 nc 211 nc 

GoldeneyeTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 0 nc nc nc nc nc nc nc nc 
Batchworth Lake 0 0 0 0 nc nc nc nc nc 0 0 0 
Stocker's and Bury Lakes 11 15 4 0 0 0 0 0 0 0 2 6 
Maple Lodge NR 0 0 0 0 0 0 0 0 0 0 0 0 
Lynsters Lake 0 0 0 0 nc 0 0 0 0 nc 0 0 
Pynesfield North/South Lakes 0 0 0 0 0 0 0 0 0 0 0 0 
Helicon Lake 0 0 0 0 0 0 0 0 0 0 1 0 
Troy Mill Lake 0 0 1 0 0 0 1 0 0 0 0 0 
Lea Valley: 
East Hyde 0 0 0 0 0 0 0 0 0 0 0 0 
Brocket Park 0 0 0 0 0 0 0 0 0 0 0 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 0 nc nc nc nc nc nc 0 0 nc 
Amwell NR - others 5 6 11 nc 0 0 0 0 0 0 1 5 
Stanstead Abbotts Lakes - N lake 0 0 0 0 0 0 0 0 0 0 1 1 
Rye Meads 0 0 0 nc nc nc nc nc 0 0 0 0 
Broxbourne GP 0 0 0 0 0 0 0 0 0 0 0 0 
Cheshunt GPs: 
Radwell Mill nc 0 0 0 nc 0 nc nc 0 0 0 0 
Panshanger Park 0 0 0 nc nc nc nc nc nc 0 0 0 
Fairlands Valley Park 0 0 0 0 0 0 0 nc 0 0 0 0 
Verulamium Park 0 0 0 0 0 0 0 0 0 0 0 0 
Tyttenhanger GPs - all 0 0 0 nc 0 0 0 0 0 0 0 0 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 0 1 0 2 0 0 0 0 1 0 0 0 
Tring Reservoirs 4 nc 2 0 0 0 0 0 0 nc 3 nc 

Ruddy DuckTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 0 nc nc nc nc nc nc nc nc 
Batchworth Lake 0 0 0 0 nc nc nc nc nc 0 0 0 
Stocker's and Bury Lakes 0 0 0 0 0 0 0 0 0 0 0 0 
Maple Lodge NR 0 0 0 0 0 0 0 0 0 0 0 0 
Lynsters Lake 0 0 0 0 nc 0 0 0 0 nc 0 0 
Pynesfield North/South Lakes 0 0 0 0 0 0 0 0 0 0 0 0 
Helicon Lake 0 0 0 0 0 0 0 0 0 0 0 0 
Troy Mill Lake 0 0 0 0 0 0 0 0 0 0 0 0 
Lea Valley: 
East Hyde 0 0 0 0 0 0 0 0 0 0 0 0 
Brocket Park 0 0 0 0 0 0 0 0 0 0 0 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 0 nc nc nc nc nc nc 0 0 nc 
Amwell NR - others 0 0 0 nc 0 0 0 0 0 0 0 0 
Stanstead Abbotts Lakes - N lake 0 0 0 0 0 0 0 0 0 0 0 0 
Rye Meads 0 0 0 nc nc nc nc nc 0 0 0 0 
Broxbourne GP 0 0 0 0 0 0 0 0 0 0 0 0 
Cheshunt GPs: 
Radwell Mill nc 0 0 0 nc 0 nc nc 0 0 0 0 
Panshanger Park 0 0 0 nc nc nc nc nc nc 0 0 0 
Fairlands Valley Park 0 0 0 0 0 0 0 nc 0 0 0 0 
Verulamium Park 0 0 0 0 0 0 0 0 0 0 0 0 
Tyttenhanger GPs - all 0 0 0 nc 0 0 0 0 0 0 0 0 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 0 0 0 0 0 0 0 0 0 0 0 0 
Tring Reservoirs 0 nc 0 0 0 0 0 0 0 nc 0 nc 

Little GrebeTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 0 nc nc nc nc nc nc nc nc 
Batchworth Lake 0 0 0 0 nc nc nc nc nc 0 0 0 
Stocker's and Bury Lakes 0 1 1 0 0 0 0 0 0 0 0 0 
Maple Lodge NR 7 4 8 7 4 2 0 8 7 5 3 0 
Lynsters Lake 0 0 0 0 nc 0 0 0 0 nc 0 0 
Pynesfield North/South Lakes 0 0 0 0 0 0 0 0 0 0 2 0 
Helicon Lake 0 0 0 0 0 0 0 0 0 0 0 0 
Troy Mill Lake 0 0 0 0 0 0 0 0 0 0 0 1 
Lea Valley: 
East Hyde 2 2 4 2 2 2 1 2 2 1 0 1 
Brocket Park 2 3 2 1 4 6 9 8 6 7 5 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 1 nc nc nc nc nc nc 0 0 nc 
Amwell NR - others 2 3 0 nc 0 0 0 0 0 1 0 0 
Stanstead Abbotts Lakes - N lake 4 2 1 1 2 0 1 0 4 4 2 3 
Rye Meads 0 7 12 nc nc nc nc nc 35 24 7 6 
Broxbourne GP 4 3 0 0 0 0 0 0 1 1 2 3 
Cheshunt GPs: 
Radwell Mill nc 4 0 0 nc 0 nc nc 0 0 4 0 
Panshanger Park 26 26 18 nc nc nc nc nc nc 25 26 24 
Fairlands Valley Park 0 0 1 0 0 0 0 nc 0 0 0 0 
Verulamium Park 0 0 2 2 1 1 2 2 3 1 0 0 
Tyttenhanger GPs - all 0 0 0 nc 0 0 0 0 2 0 0 4 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 1 2 0 2 2 2 3 7 4 7 6 4 
Tring Reservoirs 8 nc 3 2 0 0 2 9 8 nc 11 nc 

Great Crested GrebeTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 24 nc nc nc nc nc nc nc nc 
Batchworth Lake 0 5 6 8 nc nc nc nc nc 5 4 6 
Stocker's and Bury Lakes 13 4 18 14 9 16 18 21 26 29 27 4 
Maple Lodge NR 0 0 3 3 3 2 6 0 0 0 0 0 
Lynsters Lake 4 6 11 5 nc 8 6 3 2 nc 6 7 
Pynesfield North/South Lakes 1 4 6 5 6 8 8 6 6 6 4 1 
Helicon Lake 0 3 0 3 4 2 1 4 5 2 2 5 
Troy Mill Lake 16 7 6 7 13 6 7 4 9 8 5 11 
Lea Valley: 
East Hyde 0 0 0 0 0 0 0 0 0 0 0 0 
Brocket Park 1 2 2 2 2 0 4 3 2 3 1 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 2 nc nc nc nc nc nc 6 1 nc 
Amwell NR - others 1 1 12 nc 12 4 2 4 3 1 3 3 
Stanstead Abbotts Lakes - N lake 6 3 5 3 6 13 6 9 9 11 8 2 
Rye Meads 5 0 3 nc nc nc nc nc 9 7 0 0 
Broxbourne GP 8 8 14 15 14 17 20 9 22 15 6 3 
Cheshunt GPs: 
Radwell Mill nc 0 0 0 nc 0 nc nc 0 0 0 0 
Panshanger Park 1 1 2 nc nc nc nc nc nc 1 0 0 
Fairlands Valley Park 1 1 5 3 3 2 0 nc 0 0 1 5 
Verulamium Park 0 0 0 0 0 0 2 2 4 4 0 0 
Tyttenhanger GPs - all 16 7 10 nc Present 6 5 2 5 15 19 15 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 20 12 3 27 23 41 57 92 18 7 4 19 
Tring Reservoirs 10 nc 30 23 15 20 23 29 25 nc 32 nc 

CormorantTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 0 nc nc nc nc nc nc nc nc 
Batchworth Lake 0 0 0 0 nc nc nc nc nc 0 3 0 
Stocker's and Bury Lakes 24 20 17 6 2 3 5 5 15 8 35 20 
Maple Lodge NR 0 0 0 1 3 1 1 2 2 0 0 0 
Lynsters Lake 8 2 1 1 nc 0 1 0 0 nc 1 0 
Pynesfield North/South Lakes 4 3 1 0 0 0 0 0 1 0 0 0 
Helicon Lake 7 5 0 1 2 0 0 0 0 1 4 4 
Troy Mill Lake 2 3 2 0 1 0 1 0 1 11 7 2 
Lea Valley: 
East Hyde 0 1 2 1 1 0 2 2 3 3 2 3 
Brocket Park 1 0 1 4 4 2 3 6 5 9 0 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 0 nc nc nc nc nc nc 0 0 nc 
Amwell NR - others 33 44 55 nc 33 33 26 24 16 22 30 12 
Stanstead Abbotts Lakes - N lake 11 5 8 5 1 4 4 1 5 7 11 7 
Rye Meads 0 2 0 nc nc nc nc nc 28 6 4 4 
Broxbourne GP 7 5 5 4 1 4 1 5 5 5 3 5 
Cheshunt GPs: 
Radwell Mill nc 0 0 0 nc 0 nc nc 0 0 1 0 
Panshanger Park 3 6 0 nc nc nc nc nc nc 1 2 10 
Fairlands Valley Park 9 9 3 3 0 2 3 nc 5 5 6 4 
Verulamium Park 0 2 1 2 0 0 0 3 12 12 0 0 
Tyttenhanger GPs - all 75 21 6 nc Present 0 0 2 2 10 62 20 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 2 3 0 2 2 1 18 16 27 35 1 15 
Tring Reservoirs 43 nc 24 18 29 30 11 33 23 nc 51 nc 

Grey HeronTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 4 nc nc nc nc nc nc nc nc 
Batchworth Lake 0 0 0 1 nc nc nc nc nc 1 2 2 
Stocker's and Bury Lakes 12 15 22 2 19 12 3 3 3 7 5 3 
Maple Lodge NR 1 0 1 1 3 1 1 0 2 2 3 4 
Lynsters Lake 3 0 0 0 nc 1 0 0 0 nc 1 0 
Pynesfield North/South Lakes 1 1 0 1 0 1 1 2 0 0 1 0 
Helicon Lake 0 0 0 0 0 1 0 1 0 0 0 0 
Troy Mill Lake 4 0 2 1 1 4 2 0 3 3 4 1 
Lea Valley: 
East Hyde 4 2 3 1 2 1 2 2 3 4 2 4 
Brocket Park 1 1 0 0 0 0 0 1 0 1 0 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 0 nc nc nc nc nc nc 0 0 nc 
Amwell NR - others 2 10 20 nc 11 4 4 3 3 5 5 0 
Stanstead Abbotts Lakes - N lake 3 0 0 0 0 1 2 2 0 2 2 2 
Rye Meads 5 5 0 nc nc nc nc nc 8 8 5 7 
Broxbourne GP 0 0 1 3 0 3 1 0 1 3 1 1 
Cheshunt GPs: 
Radwell Mill nc 1 1 0 nc 0 nc nc 0 1 1 2 
Panshanger Park 4 4 0 nc nc nc nc nc nc 1 3 0 
Fairlands Valley Park 0 0 0 0 0 2 1 nc 0 0 0 0 
Verulamium Park 0 4 5 1 6 3 3 1 2 1 1 2 
Tyttenhanger GPs - all 8 8 20 nc Present 14 3 4 5 4 4 4 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 1 1 0 0 1 2 1 4 0 2 1 1 
Tring Reservoirs 4 nc 12 12 7 7 9 10 4 nc 17 nc 

MoorhenTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 11 nc nc nc nc nc nc nc nc 
Batchworth Lake 5 9 5 3 nc nc nc nc nc 5 4 6 
Stocker's and Bury Lakes 30 0 12 12 2 4 6 6 4 21 15 18 
Maple Lodge NR 4 6 7 6 4 4 12 6 8 5 4 2 
Lynsters Lake 0 1 1 1 nc 0 0 1 1 nc 0 0 
Pynesfield North/South Lakes 0 2 2 1 1 1 2 2 1 7 8 1 
Helicon Lake 4 6 3 1 2 2 3 1 2 0 3 2 
Troy Mill Lake 5 8 10 3 1 0 13 3 5 9 2 8 
Lea Valley: 
East Hyde 21 18 19 15 12 10 12 15 19 13 12 17 
Brocket Park 13 17 17 7 16 6 7 10 18 26 32 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 7 nc nc nc nc nc nc 2 5 nc 
Amwell NR - others 13 17 15 nc 5 7 11 2 10 12 8 9 
Stanstead Abbotts Lakes - N lake 4 5 9 4 3 9 3 7 6 6 4 2 
Rye Meads 81 88 74 nc nc nc nc nc 97 78 41 45 
Broxbourne GP 4 10 6 5 1 1 2 5 12 4 7 5 
Cheshunt GPs: 
Radwell Mill nc 1 5 1 nc 2 nc nc 0 1 2 5 
Panshanger Park 18 34 10 nc nc nc nc nc nc 5 6 8 
Fairlands Valley Park 47 42 35 31 20 23 25 nc 34 46 36 26 
Verulamium Park 11 18 8 6 5 14 14 19 13 10 27 10 
Tyttenhanger GPs - all 26 23 30 nc Present 9 32 Present 14 23 31 20 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 3 2 0 3 0 5 4 4 8 3 3 2 
Tring Reservoirs 43 nc 20 12 7 4 22 49 58 nc 74 nc 

CootTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 
Hampermill Lake nc nc nc 30 nc nc nc nc nc nc nc nc 
Batchworth Lake 21 28 36 35 nc nc nc nc nc 19 12 19 
Stocker's and Bury Lakes 562 0 192 118 91 81 90 212 235 254 241 337 
Maple Lodge NR 6 20 16 15 22 22 11 5 6 8 5 1 
Lynsters Lake 317 157 72 37 nc 56 85 85 165 nc 100 230 
Pynesfield North/South Lakes 91 54 72 49 44 56 62 58 131 108 136 198 
Helicon Lake 84 78 40 21 17 17 32 39 58 42 68 72 
Troy Mill Lake 300 292 117 85 33 37 29 173 237 292 452 277 
Lea Valley: 
East Hyde 10 21 18 26 16 14 10 11 12 22 11 32 
Brocket Park 84 84 70 27 33 37 68 77 68 101 89 nc 
Stanborough Lakes North nc nc nc nc nc nc nc nc nc nc nc nc 
Stanborough Lakes South nc nc nc nc nc nc nc nc nc nc nc nc 
King's Meads nc nc nc nc nc nc nc nc nc nc nc nc 
Amwell GP - Ware / Thrift GP nc nc 20 nc nc nc nc nc nc 11 7 nc 
Amwell NR - others 370 152 117 nc 57 65 196 256 314 263 255 213 
Stanstead Abbotts Lakes - N lake 139 102 91 30 42 45 43 71 113 177 168 103 
Rye Meads 128 157 162 nc nc nc nc nc 464 348 144 112 
Broxbourne GP 404 308 183 105 63 59 140 102 204 277 405 443 
Cheshunt GPs: 
Radwell Mill nc 5 2 0 nc 3 nc nc 1 2 1 2 
Panshanger Park 188 206 127 nc nc nc nc nc nc 162 183 174 
Fairlands Valley Park 45 36 36 33 31 38 38 nc 47 44 36 41 
Verulamium Park 74 58 59 47 37 31 63 66 61 66 60 80 
Tyttenhanger GPs - all 90 84 120 nc Present 40 70 Present 62 36 52 40 
Aldenham Reservoir nc nc nc nc nc nc nc nc nc nc nc nc 
Hilfield Park Reservoir 139 55 Present 74 74 138 217 180 91 65 53 37 
Tring Reservoirs 478 nc 155 143 147 215 570 695 651 nc 170 nc