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 2022 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 2022 the core count were the following Sundays: 23 Jan, 20 Feb, 20 Mar, 17 Apr, 15 May, 19 Jun, 17 Jul, 14 Aug, 11 Sep, 9 Oct, 13 Nov, 11 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. If you are able to help in the Lee Valley please contact Cath Patrick (c/o LVRP, Myddleton House, Bull’s Cross, Enfield, EN2, 9HG). For elsewhere in Hertfordshire please contact the national organisers. Thank you.


Mute SwanTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 28 38 33 14 15 19 32 37 19 21 32 21 
Batchworth Lake 11 22 9 nc 1 1 0 nc 1 2 nc nc 
Stocker's and Bury Lakes 5 6 7 7 13 14 19 22 11 7 8 5 
Maple Lodge NR 2 2 2 0 nc 0 nc 0 0 0 1 nc 
Lynsters Lake 0 nc 4 nc 1 nc 0 2 0 3 9 4 
Pynesfield North/South Lakes 4 2 2 3 0 2 7 9 7 9 6 2 
Helicon Lake 4 4 8 3 0 0 0 0 0 0 6 2 
Troy Mill Lake 2 2 1 1 0 2 6 4 0 0 2 8 
Lea Valley: 
East Hyde 2 2 4 2 2 4 4 4 5 5 4 1 
Brocket Park 0 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 0 2 nc 0 0 nc 0 0 0 0 0 0 
Amwell GP - Ware / Thrift GP 2 nc 0 3 0 nc 0 0 0 1 0 nc 
Amwell NR - others 10 6 2 0 1 3 2 4 3 5 4 6 
Stanstead Innings 2 4 5 4 1 2 2 4 2 5 7 3 
Rye Meads 8 0 11 nc nc nc nc nc 29 39 34 1 
Broxbourne GP 4 3 4 4 2 3 2 2 2 7 0 1 
Cheshunt GPs: 
Radwell Mill 9 11 12 7 nc nc nc 9 14 18 22 nc 
Panshanger Park 2 0 2 4 4 3 nc nc 4 2 2 0 
Fairlands Valley Park 2 2 2 2 2 2 2 2 3 3 2 2 
Verulamium Park 3 7 7 2 5 2 2 6 0 7 7 7 
Tyttenhanger GPs - all 5 6 6 9 5 4 nc 4 5 9 4 nc 
Hilfield Park Reservoir 3 2 7 4 7 22 27 11 5 4 2 5 
Tring Reservoirs 7 6 nc 11 26 nc 44 40 nc 51 56 7 

Canada GooseTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 280 101 253 128 95 238 133 110 147 223 14 108 
Batchworth Lake 37 49 81 nc 21 44 29 nc 4 36 nc nc 
Stocker's and Bury Lakes 137 46 129 122 47 181 78 60 116 98 13 106 
Maple Lodge NR 39 4 11 5 nc 11 nc 1 1 0 0 nc 
Lynsters Lake 65 nc 32 nc 24 nc 7 37 0 89 1 0 
Pynesfield North/South Lakes 0 0 0 0 0 0 0 8 25 0 0 0 
Helicon Lake 0 0 0 0 0 0 0 4 1 0 0 0 
Troy Mill Lake 2 2 0 1 3 2 19 0 0 0 0 2 
Lea Valley: 
East Hyde 143 122 140 69 107 89 72 111 33 97 123 220 
Brocket Park 33 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 0 0 nc 0 0 nc 0 0 0 0 0 0 
Amwell GP - Ware / Thrift GP 7 nc 5 9 8 nc 19 1 0 0 1 nc 
Amwell NR - others 53 71 37 47 29 43 113 204 0 9 14 2 
Stanstead Innings 4 31 30 30 29 34 8 2 25 4 10 15 
Rye Meads 65 8 12 nc nc nc nc nc 29 3 56 3 
Broxbourne GP 0 4 5 14 7 19 0 0 0 0 0 0 
Cheshunt GPs: 
Radwell Mill 12 6 12 7 nc nc nc 0 0 2 0 nc 
Panshanger Park 0 6 37 31 38 44 nc nc 1 29 18 0 
Fairlands Valley Park 89 89 98 60 55 233 197 52 71 164 553 12 
Verulamium Park 10 33 21 26 94 77 12 33 6 16 33 0 
Tyttenhanger GPs - all 116 106 26 17 21 20 nc 22 160 120 60 nc 
Hilfield Park Reservoir 29 2 4 2 6 124 35 0 0 0 0 2 
Tring Reservoirs 77 55 nc 31 24 nc 79 119 nc 237 0 201 

WigeonTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 56 20 0 0 0 0 0 0 0 9 10 72 
Batchworth Lake 0 0 0 nc 0 0 0 nc 0 0 nc nc 
Stocker's and Bury Lakes 16 18 0 0 0 0 0 0 0 0 0 0 
Maple Lodge NR 1 0 0 0 nc 0 nc 0 0 0 3 nc 
Lynsters Lake 0 nc 0 nc 0 nc 0 0 0 0 0 5 
Pynesfield North/South Lakes 39 2 0 0 0 0 0 0 0 1 5 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 8 2 67 
Lea Valley: 
East Hyde 0 0 0 0 0 0 0 2 0 0 0 0 
Brocket Park 0 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 2 0 nc 1 0 nc 0 0 0 0 5 0 
Amwell GP - Ware / Thrift GP 0 nc 0 0 0 nc 0 0 0 0 0 nc 
Amwell NR - others 0 0 0 0 0 0 0 0 7 3 7 0 
Stanstead Innings 0 0 0 0 0 0 0 0 0 0 0 0 
Rye Meads 0 0 0 nc nc nc nc nc 5 25 0 0 
Broxbourne GP 0 0 0 0 0 0 0 0 0 0 0 0 
Cheshunt GPs: 
Radwell Mill 0 0 0 0 nc nc nc 0 0 0 0 nc 
Panshanger Park 37 0 0 0 0 0 nc nc 10 0 25 6 
Fairlands Valley Park 0 0 0 0 0 0 0 0 0 0 0 0 
Verulamium Park 0 0 0 0 0 0 0 0 0 0 0 0 
Tyttenhanger GPs - all 0 0 0 0 0 0 nc 0 0 0 0 nc 
Hilfield Park Reservoir 16 0 0 0 0 0 0 0 0 0 2 76 
Tring Reservoirs 209 18 nc 0 0 nc 0 0 nc 38 153 157 

GadwallTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 66 26 24 12 2 29 80 43 29 21 33 95 
Batchworth Lake 0 0 0 nc 0 0 0 nc 0 0 nc nc 
Stocker's and Bury Lakes 10 7 3 0 1 21 75 43 8 9 11 4 
Maple Lodge NR 9 12 17 8 nc 8 nc 0 2 0 5 nc 
Lynsters Lake 2 nc 4 nc 1 nc 0 0 0 0 2 5 
Pynesfield North/South Lakes 45 7 0 0 0 0 0 0 19 10 15 6 
Helicon Lake 0 0 0 0 0 0 0 0 0 0 0 75 
Troy Mill Lake 0 0 0 4 0 0 5 0 0 2 0 5 
Lea Valley: 
East Hyde 2 6 4 2 3 2 0 0 0 0 0 20 
Brocket Park 0 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 15 15 nc 4 9 nc 0 0 0 0 8 0 
Amwell GP - Ware / Thrift GP 0 nc 1 1 0 nc 4 0 2 0 0 nc 
Amwell NR - others 10 4 4 2 6 2 36 29 30 13 43 56 
Stanstead Innings 13 17 16 15 6 2 24 21 34 59 19 2 
Rye Meads 0 30 120 nc nc nc nc nc 347 270 127 88 
Broxbourne GP 32 12 0 0 1 0 0 0 2 0 0 36 
Cheshunt GPs: 
Radwell Mill 0 15 14 6 nc nc nc 2 0 3 0 nc 
Panshanger Park 124 73 45 15 17 24 nc nc 87 79 85 119 
Fairlands Valley Park 0 0 0 0 0 0 0 0 0 0 0 0 
Verulamium Park 0 0 2 10 9 1 0 0 0 0 0 2 
Tyttenhanger GPs - all 17 7 6 6 0 8 nc 7 6 0 40 nc 
Hilfield Park Reservoir 20 38 17 18 7 37 86 34 24 20 22 26 
Tring Reservoirs 36 31 nc 14 9 nc 59 112 nc 31 48 112 

TealTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 13 9 6 0 0 0 0 10 66 13 15 0 
Batchworth Lake 0 0 0 nc 0 0 0 nc 0 0 nc nc 
Stocker's and Bury Lakes 0 0 4 0 0 0 0 0 0 0 6 0 
Maple Lodge NR 13 7 2 0 nc 0 nc 10 65 10 9 nc 
Lynsters Lake 0 nc 0 nc 0 nc 0 0 0 0 0 0 
Pynesfield North/South Lakes 0 0 0 0 0 0 0 0 1 3 0 0 
Helicon Lake 0 2 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 6 
Brocket Park 0 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 0 0 nc 0 0 nc 0 0 0 0 0 27 
Amwell GP - Ware / Thrift GP 2 nc 0 0 0 nc 0 0 0 0 0 nc 
Amwell NR - others 0 3 8 4 0 0 0 0 5 12 3 6 
Stanstead Innings 0 2 0 0 0 0 0 0 0 4 1 2 
Rye Meads 66 31 23 nc nc nc nc nc 34 72 26 68 
Broxbourne GP 0 0 0 0 0 0 0 0 0 0 0 0 
Cheshunt GPs: 
Radwell Mill 0 0 0 0 nc nc nc 0 3 2 0 nc 
Panshanger Park 71 8 26 9 0 0 nc nc 44 5 36 62 
Fairlands Valley Park 2 0 0 0 0 0 0 0 0 0 1 0 
Verulamium Park 0 0 0 0 0 0 0 0 0 0 0 0 
Tyttenhanger GPs - all 10 7 20 0 0 0 nc 0 1 23 32 nc 
Hilfield Park Reservoir 0 7 11 8 0 0 0 0 2 3 6 0 
Tring Reservoirs 115 59 nc 0 0 nc 0 54 nc 149 404 299 

MallardTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 161 111 141 91 41 119 105 88 74 52 52 24 
Batchworth Lake 48 47 40 nc 29 23 15 nc 39 4 nc nc 
Stocker's and Bury Lakes 79 31 60 68 0 82 88 67 19 20 17 9 
Maple Lodge NR 16 18 24 15 nc 12 nc 0 11 2 32 nc 
Lynsters Lake 0 nc 1 nc 2 nc 0 11 0 6 0 4 
Pynesfield North/South Lakes 10 0 4 0 5 0 1 6 3 18 0 0 
Helicon Lake 2 4 7 0 4 2 0 3 0 0 0 2 
Troy Mill Lake 6 11 5 8 1 0 1 1 2 2 3 9 
Lea Valley: 
East Hyde 15 22 33 15 10 17 13 17 11 10 14 26 
Brocket Park 7 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 0 4 nc 0 3 nc 0 0 0 0 0 0 
Amwell GP - Ware / Thrift GP 7 nc 14 1 2 nc 12 7 5 12 27 nc 
Amwell NR - others 39 9 11 8 12 12 17 15 10 12 10 12 
Stanstead Innings 14 13 19 23 21 10 24 31 10 24 33 12 
Rye Meads 45 42 37 nc nc nc nc nc 67 37 78 35 
Broxbourne GP 11 9 17 23 14 6 36 10 22 9 15 10 
Cheshunt GPs: 
Radwell Mill 43 22 19 25 nc nc nc 0 56 50 27 nc 
Panshanger Park 51 24 0 44 28 22 nc nc 17 7 32 24 
Fairlands Valley Park 72 57 40 39 41 78 84 125 132 76 84 88 
Verulamium Park 44 81 38 69 87 69 44 70 64 43 58 55 
Tyttenhanger GPs - all 34 9 10 9 11 8 nc 8 1 2 5 nc 
Hilfield Park Reservoir 8 8 13 9 17 3 2 2 0 0 8 18 
Tring Reservoirs 105 93 nc 56 90 nc 223 461 nc 253 203 278 

ShovelerTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 29 26 45 3 0 2 1 0 20 82 76 65 
Batchworth Lake 0 0 0 nc 0 0 0 nc 0 0 nc nc 
Stocker's and Bury Lakes 25 19 31 2 0 0 1 0 20 82 76 56 
Maple Lodge NR 4 7 14 1 nc 2 nc 0 0 0 0 nc 
Lynsters Lake 0 nc 0 nc 0 nc 0 0 0 0 0 4 
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 1 
Troy Mill Lake 0 0 0 0 0 0 0 0 0 0 0 4 
Lea Valley: 
East Hyde 0 0 0 0 0 0 0 0 0 0 0 0 
Brocket Park 0 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 10 18 nc 0 0 nc 0 0 0 0 28 6 
Amwell GP - Ware / Thrift GP 11 nc 0 0 0 nc 0 0 3 0 9 nc 
Amwell NR - others 35 57 28 0 0 0 0 5 13 29 32 10 
Stanstead Innings 14 8 2 0 2 0 1 2 2 13 1 1 
Rye Meads 10 72 66 nc nc nc nc nc 49 61 33 34 
Broxbourne GP 2 0 0 0 0 0 0 0 0 0 0 3 
Cheshunt GPs: 
Radwell Mill 0 0 0 0 nc nc nc 0 3 4 13 nc 
Panshanger Park 16 8 0 0 0 0 nc nc 0 7 8 10 
Fairlands Valley Park 0 0 0 0 0 0 0 0 0 0 0 0 
Verulamium Park 0 0 0 0 0 0 0 0 0 0 0 0 
Tyttenhanger GPs - all 9 2 8 8 0 0 nc 0 12 27 19 nc 
Hilfield Park Reservoir 16 20 53 10 0 0 0 0 49 47 36 59 
Tring Reservoirs 162 134 nc 0 2 nc 3 19 nc 86 0 72 

PochardTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 78 66 43 19 20 3 5 37 27 68 62 24 
Batchworth Lake 4 10 0 nc 0 0 0 nc 0 1 nc nc 
Stocker's and Bury Lakes 50 30 15 9 11 1 3 37 27 57 46 5 
Maple Lodge NR 1 3 10 9 nc 2 nc 0 0 0 0 nc 
Lynsters Lake 0 nc 0 nc 6 nc 0 0 0 9 7 5 
Pynesfield North/South Lakes 7 0 9 0 0 0 0 0 0 0 9 0 
Helicon Lake 0 0 9 0 0 0 0 0 0 0 0 14 
Troy Mill Lake 16 23 0 1 3 0 2 0 0 1 0 0 
Lea Valley: 
East Hyde 0 0 0 0 0 0 0 0 0 0 0 0 
Brocket Park 0 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 0 3 nc 0 4 nc 0 0 0 0 0 0 
Amwell GP - Ware / Thrift GP 53 nc 12 4 0 nc 0 0 11 7 70 nc 
Amwell NR - others 14 27 5 7 4 11 8 8 89 65 20 27 
Stanstead Innings 21 14 15 17 6 4 6 17 19 15 21 22 
Rye Meads 1 6 15 nc nc nc nc nc 0 0 0 0 
Broxbourne GP 3 7 3 2 1 2 0 0 4 3 6 11 
Cheshunt GPs: 
Radwell Mill 0 0 0 0 nc nc nc 0 0 0 0 nc 
Panshanger Park 6 7 2 0 0 3 nc nc 29 17 12 2 
Fairlands Valley Park 0 0 0 0 0 0 0 0 0 0 0 0 
Verulamium Park 0 5 4 6 0 2 0 0 0 0 0 1 
Tyttenhanger GPs - all 4 15 3 0 1 1 nc 0 1 3 8 nc 
Hilfield Park Reservoir 46 17 0 0 0 58 117 52 12 27 28 35 
Tring Reservoirs 131 78 nc 3 1 nc 37 45 nc 153 77 94 

Tufted DuckTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 307 238 233 113 96 37 54 76 33 93 239 218 
Batchworth Lake 30 30 10 nc 15 0 0 nc 0 0 nc nc 
Stocker's and Bury Lakes 119 78 95 75 31 14 26 46 7 32 108 85 
Maple Lodge NR 25 14 36 9 nc 15 nc 0 0 0 1 nc 
Lynsters Lake 11 nc 8 nc 6 nc 12 28 18 38 71 52 
Pynesfield North/South Lakes 41 57 33 5 41 5 12 2 8 2 26 0 
Helicon Lake 6 8 1 5 3 3 4 0 0 0 3 19 
Troy Mill Lake 75 51 50 19 0 0 0 0 0 21 30 62 
Lea Valley: 
East Hyde 0 0 0 0 3 0 0 0 0 0 0 0 
Brocket Park 0 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 0 9 nc 24 11 nc 0 0 0 0 1 0 
Amwell GP - Ware / Thrift GP 51 nc 54 41 29 nc 27 15 53 40 73 nc 
Amwell NR - others 60 126 83 31 21 18 8 29 46 54 80 33 
Stanstead Innings 82 71 43 43 35 33 9 27 28 45 87 65 
Rye Meads 11 43 63 nc nc nc nc nc 71 33 26 37 
Broxbourne GP 25 70 55 55 1 17 119 159 48 90 0 59 
Cheshunt GPs: 
Radwell Mill 0 0 4 7 nc nc nc 0 0 0 0 nc 
Panshanger Park 41 46 42 49 8 19 nc nc 69 34 39 37 
Fairlands Valley Park 0 0 0 0 1 0 0 0 0 0 0 0 
Verulamium Park 0 4 2 6 12 3 0 0 8 0 0 0 
Tyttenhanger GPs - all 42 86 33 32 31 31 nc 21 22 0 40 nc 
Hilfield Park Reservoir 199 121 190 115 17 31 111 131 82 61 86 141 
Tring Reservoirs 290 203 nc 172 55 nc 192 229 nc 266 224 161 

GoldeneyeTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 2 7 0 0 0 0 0 0 0 0 0 5 
Batchworth Lake 0 0 0 nc 0 0 0 nc 0 0 nc nc 
Stocker's and Bury Lakes 2 7 0 0 0 0 0 0 0 0 0 3 
Maple Lodge NR 0 0 0 0 nc 0 nc 0 0 0 0 nc 
Lynsters Lake 0 nc 0 nc 0 nc 0 0 0 0 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 2 
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 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 0 0 nc 0 0 nc 0 0 0 0 0 0 
Amwell GP - Ware / Thrift GP 0 nc 0 0 0 nc 0 0 0 0 0 nc 
Amwell NR - others 0 3 0 0 0 0 0 0 0 0 1 1 
Stanstead Innings 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 0 0 0 0 nc nc nc 0 0 0 0 nc 
Panshanger Park 0 0 0 0 0 0 nc nc 0 0 0 0 
Fairlands Valley Park 0 0 0 0 0 0 0 0 0 0 0 0 
Verulamium Park 0 0 0 0 0 0 0 0 0 0 0 0 
Tyttenhanger GPs - all 0 0 0 0 0 0 nc 0 0 0 0 nc 
Hilfield Park Reservoir 0 0 3 0 0 0 0 0 0 0 0 1 
Tring Reservoirs 10 0 nc 0 0 nc 0 0 nc 2 7 11 

Little GrebeTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 3 7 5 5 0 4 1 2 2 3 0 2 
Batchworth Lake 0 0 0 nc 0 0 0 nc 0 0 nc nc 
Stocker's and Bury Lakes 0 0 0 0 0 0 0 0 1 0 0 0 
Maple Lodge NR 2 7 5 5 nc 4 nc 2 1 3 0 nc 
Lynsters Lake 0 nc 0 nc 0 nc 0 0 0 0 0 0 
Pynesfield North/South Lakes 1 0 0 0 0 0 0 0 0 0 0 0 
Helicon Lake 0 0 0 0 0 0 0 0 0 0 0 1 
Troy Mill Lake 0 0 0 0 0 0 1 0 0 0 0 1 
Lea Valley: 
East Hyde 1 1 2 0 2 2 2 1 2 4 1 1 
Brocket Park 1 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 0 1 nc 0 0 nc 0 0 0 0 0 0 
Amwell GP - Ware / Thrift GP 0 nc 0 0 0 nc 0 0 0 3 1 nc 
Amwell NR - others 1 0 0 0 0 0 0 0 1 3 1 11 
Stanstead Innings 1 1 4 0 0 2 0 0 0 1 0 3 
Rye Meads 3 10 20 nc nc nc nc nc 38 17 14 6 
Broxbourne GP 0 2 0 0 0 0 0 0 0 1 0 1 
Cheshunt GPs: 
Radwell Mill 6 2 0 0 nc nc nc 0 2 2 4 nc 
Panshanger Park 0 27 22 21 15 16 nc nc 32 4 21 14 
Fairlands Valley Park 0 1 0 0 0 0 0 0 0 0 0 0 
Verulamium Park 1 1 0 0 0 7 0 0 0 0 0 0 
Tyttenhanger GPs - all 0 0 3 0 0 0 nc 0 1 1 1 nc 
Hilfield Park Reservoir 6 2 8 8 4 6 6 6 16 7 10 8 
Tring Reservoirs 3 3 nc 2 0 nc 10 12 nc 16 23 7 

Great Crested GrebeTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 36 23 26 13 33 22 26 33 46 48 50 28 
Batchworth Lake 8 9 2 nc 4 2 4 nc 7 7 nc nc 
Stocker's and Bury Lakes 10 10 11 11 20 8 12 20 20 15 22 8 
Maple Lodge NR 0 0 2 0 nc 2 nc 0 0 0 0 nc 
Lynsters Lake 7 nc 2 nc 1 nc 2 1 2 9 6 4 
Pynesfield North/South Lakes 6 3 5 0 4 2 3 5 6 4 6 2 
Helicon Lake 1 1 0 0 0 2 0 0 0 0 1 2 
Troy Mill Lake 4 0 4 2 4 6 5 7 11 13 15 12 
Lea Valley: 
East Hyde 0 0 0 0 0 0 0 0 0 0 0 0 
Brocket Park 1 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 0 0 nc 0 0 nc 0 0 0 0 0 0 
Amwell GP - Ware / Thrift GP 3 nc 4 6 3 nc 8 7 7 5 6 nc 
Amwell NR - others 5 6 8 3 7 9 4 4 6 7 8 6 
Stanstead Innings 2 3 10 13 4 9 9 16 11 11 12 2 
Rye Meads 0 0 1 nc nc nc nc nc 0 0 0 0 
Broxbourne GP 2 3 9 12 12 18 16 14 17 9 6 6 
Cheshunt GPs: 
Radwell Mill 0 0 0 0 nc nc nc 0 0 0 0 nc 
Panshanger Park 1 4 3 7 2 0 nc nc 11 1 0 0 
Fairlands Valley Park 1 3 3 3 4 3 2 2 2 2 5 2 
Verulamium Park 0 0 0 1 0 0 0 0 0 0 0 0 
Tyttenhanger GPs - all 3 8 8 11 6 12 nc 5 1 5 4 nc 
Hilfield Park Reservoir 4 7 22 18 22 30 44 37 30 25 31 3 
Tring Reservoirs 42 31 nc 28 25 nc 32 29 nc 23 34 5 

CormorantTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 48 71 26 6 12 8 5 20 34 46 48 11 
Batchworth Lake 7 5 3 nc 1 0 2 nc 1 0 nc nc 
Stocker's and Bury Lakes 10 24 10 5 10 5 2 8 14 20 19 4 
Maple Lodge NR 0 0 0 0 nc 1 nc 1 1 0 0 nc 
Lynsters Lake 0 nc 3 nc 0 nc 0 0 0 0 1 4 
Pynesfield North/South Lakes 11 10 0 0 0 1 0 1 0 0 6 0 
Helicon Lake 6 5 2 0 0 0 1 0 0 0 0 2 
Troy Mill Lake 14 27 8 1 1 1 0 10 18 26 22 1 
Lea Valley: 
East Hyde 2 3 2 1 1 2 1 1 2 6 2 1 
Brocket Park 1 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 0 0 nc 0 0 nc 0 0 0 0 0 0 
Amwell GP - Ware / Thrift GP 10 nc 3 2 2 nc 2 2 1 4 7 nc 
Amwell NR - others 15 29 26 31 36 18 7 4 9 25 15 23 
Stanstead Innings 6 6 3 3 5 2 5 0 2 2 6 13 
Rye Meads 2 0 2 nc nc nc nc nc 15 10 5 5 
Broxbourne GP 15 6 3 1 6 1 2 2 3 10 0 6 
Cheshunt GPs: 
Radwell Mill 0 0 0 0 nc nc nc 0 0 0 0 nc 
Panshanger Park 12 5 8 3 4 1 nc nc 1 7 4 5 
Fairlands Valley Park 9 3 3 0 3 2 5 3 8 1 5 6 
Verulamium Park 1 2 1 0 0 0 0 0 0 1 0 5 
Tyttenhanger GPs - all 12 12 11 9 9 5 nc 5 0 9 18 nc 
Hilfield Park Reservoir 36 1 3 4 3 2 4 0 26 32 57 3 
Tring Reservoirs 64 39 nc 23 24 nc 18 34 nc 48 56 67 

Grey HeronTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 18 13 20 22 6 13 14 8 11 10 8 6 
Batchworth Lake 1 1 0 nc 0 0 0 nc 1 1 nc nc 
Stocker's and Bury Lakes 11 8 19 19 4 4 11 3 7 3 2 1 
Maple Lodge NR 0 0 0 1 nc 4 nc 2 0 1 0 nc 
Lynsters Lake 1 nc 0 nc 0 nc 0 0 1 1 1 0 
Pynesfield North/South Lakes 3 2 1 1 1 1 1 3 1 1 2 0 
Helicon Lake 1 1 0 1 1 0 0 0 1 0 1 1 
Troy Mill Lake 1 1 0 0 0 4 2 0 0 3 2 4 
Lea Valley: 
East Hyde 2 3 2 2 3 3 2 1 1 2 3 1 
Brocket Park 0 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 0 0 nc 0 1 nc 0 0 0 0 0 0 
Amwell GP - Ware / Thrift GP 0 nc 0 0 1 nc 1 1 3 2 0 nc 
Amwell NR - others 10 8 20 6 13 8 5 7 2 6 4 4 
Stanstead Innings 0 1 1 1 0 2 1 2 1 0 0 0 
Rye Meads 2 1 1 nc nc nc nc nc 6 4 3 3 
Broxbourne GP 0 1 0 1 1 2 3 2 1 3 0 1 
Cheshunt GPs: 
Radwell Mill 2 0 1 0 nc nc nc 1 2 1 0 nc 
Panshanger Park 1 2 1 0 2 1 nc nc 4 1 1 1 
Fairlands Valley Park 0 1 1 0 0 1 2 0 0 2 0 0 
Verulamium Park 0 2 0 0 4 4 2 0 1 0 1 1 
Tyttenhanger GPs - all 7 9 11 14 6 5 nc 4 3 3 3 nc 
Hilfield Park Reservoir 1 0 0 1 1 0 0 1 2 2 2 1 
Tring Reservoirs 15 15 nc 3 7 nc 8 9 nc 10 6 11 

MoorhenTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 54 35 38 27 6 15 14 33 49 54 20 22 
Batchworth Lake 6 6 2 nc 3 4 6 nc 4 2 nc nc 
Stocker's and Bury Lakes 27 9 17 13 0 4 7 12 6 13 5 8 
Maple Lodge NR 10 5 8 6 nc 5 nc 20 29 28 5 nc 
Lynsters Lake 0 nc 1 nc 0 nc 0 0 0 1 0 0 
Pynesfield North/South Lakes 3 9 4 1 0 2 1 1 8 8 5 2 
Helicon Lake 4 2 3 1 2 0 0 0 2 2 3 5 
Troy Mill Lake 4 4 3 6 1 0 0 0 0 0 2 7 
Lea Valley: 
East Hyde 31 17 28 17 15 22 20 22 24 24 37 33 
Brocket Park 18 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 2 0 nc 0 0 nc 16 0 7 0 0 3 
Amwell GP - Ware / Thrift GP 4 nc 5 14 2 nc 1 11 2 5 4 nc 
Amwell NR - others 18 3 6 4 3 5 11 8 12 12 12 5 
Stanstead Innings 7 11 10 15 5 9 16 14 7 15 7 6 
Rye Meads 26 28 28 nc nc nc nc nc 77 57 42 19 
Broxbourne GP 5 5 0 5 3 3 4 3 14 9 0 12 
Cheshunt GPs: 
Radwell Mill 4 5 7 3 nc nc nc 7 8 3 4 nc 
Panshanger Park 10 3 14 8 6 8 nc nc 13 23 12 1 
Fairlands Valley Park 30 23 19 20 10 15 20 20 29 28 22 22 
Verulamium Park 31 30 15 13 6 8 6 11 22 19 22 25 
Tyttenhanger GPs - all 20 12 8 3 2 3 nc 4 0 11 13 nc 
Hilfield Park Reservoir 4 1 5 3 4 2 4 1 5 5 4 5 
Tring Reservoirs 22 9 nc 6 4 nc 23 44 nc 57 42 36 

CootTop of page

JanFebMarAprMayJunJulAugSepOctNovDec 
Colne Valley: 947 599 429 191 202 211 330 431 712 851 973 958 
Batchworth Lake 107 64 47 nc 24 22 42 nc 31 33 nc nc 
Stocker's and Bury Lakes 211 174 134 110 81 125 128 93 244 215 249 275 
Maple Lodge NR 17 13 28 15 nc 22 nc 3 0 0 4 nc 
Lynsters Lake 45 nc 32 nc 20 nc 43 33 56 182 232 204 
Pynesfield North/South Lakes 208 169 48 16 31 37 51 64 109 155 156 159 
Helicon Lake 139 139 97 16 16 5 7 20 107 144 172 159 
Troy Mill Lake 220 40 43 34 30 0 59 218 165 122 160 161 
Lea Valley: 
East Hyde 11 14 12 12 10 10 14 10 7 10 10 13 
Brocket Park 37 nc nc nc nc nc nc nc nc nc nc nc 
King's Meads 11 17 nc 13 11 nc 8 4 0 0 13 10 
Amwell GP - Ware / Thrift GP 14 nc 16 30 21 nc 17 55 35 27 16 nc 
Amwell NR - others 129 109 82 37 31 31 103 153 214 254 305 290 
Stanstead Innings 72 65 50 64 63 65 39 35 68 97 122 109 
Rye Meads 35 23 103 nc nc nc nc nc 362 370 228 116 
Broxbourne GP 293 237 171 153 105 93 119 116 137 103 102 221 
Cheshunt GPs: 
Radwell Mill 1 3 6 2 nc nc nc 1 0 0 0 nc 
Panshanger Park 115 116 71 63 54 65 nc nc 105 140 121 102 
Fairlands Valley Park 15 21 24 19 15 15 23 24 17 20 16 18 
Verulamium Park 40 44 35 31 47 59 78 33 43 40 54 47 
Tyttenhanger GPs - all 75 78 75 39 34 10 nc 15 65 65 75 nc 
Hilfield Park Reservoir 68 27 55 68 48 111 223 203 188 199 151 159 
Tring Reservoirs 774 356 nc 108 176 nc 584 915 nc 720 584 201