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Description
The attraction of this route is that it takes the visitor through several areas of varying habitats. These include mixed woodland, permanent pasture and arable farmland. The reservoir has two small inflow streams and these areas have willows and reed fringe banks. The main body of the reservoir is always worth checking, as is the rocky dam. Thornton Reservoir is a trout fishery, with both bank fishing and boat anglers. The season runs from February to November and this obviously causes some disturbance. The reservoir has also become very popular with walkers, dog walkers, joggers and cyclists. All these activities can impact on the birding experience and likely busy times are best avoided.
A short visit can be productive as most of the reservoir is viewable from the main car park. Common species of water birds can be seen, including geese, duck, and grebes. A longer visit, involving a walk around the reservoir can present a wide range of farm and woodland species. This makes Thornton a suitable site for the novice.
In winter with less disturbance from anglers a small gull roost can develop. All of the five common gull species can be seen and Sorthovedet Måge is annual. Wildfowl numbers can be variable. In recent years flocks of Canadagås and Grågås have taken to grazing the surrounding pasture and resting on the reservoir. Bramgås, Kortnæbbet Gås and Nilgås have all been seen associating with these commoner species. Rarer ducks that are worth checking for include Hvinand, Bjergand, Lille Skallesluger and Stor Skallesluger. Alder trees are found at both inflows and these regularly have small flocks of Grønsisken and Lille Gråsisken. Finch flocks have been increasing in recent years as stubble is often left until the spring. Although mainly Bogfinke, Gulspurv and occasional Kvækerfinke are also seen.
Spring passage can produce some variety. Mudderklire are regular on the dam, and the pasture along the east bank is worth checking for Gul Vipstjert, Stenpikker and Ringdrossel. Two tern rafts were installed by LROS and Fjordterne has bred. Both Havterne and Sortterne are seen on passage. Dværgmåge and Ride can occasionally be encountered. In summer the common warblers breed, although Rørsanger, Sivsanger and Græshoppesanger are now less frequent. Bjergvipstjert is a regular breeder and family groups can be seen in the spillway. Common raptors such as Musvåge, Spurvehøg and Tårnfalk can give great views, and Lærkefalk, Rød Glente and Fiskeørn are now more regular.
Unless water levels are low there is little wader passage at Thornton. However, the dam is always worth checking and has yielded Klyde, Enkeltbekkasin, Småspove and Islandsk Ryle in recent years. Autumnal storms can deliver surprises, and Stor Stormsvale, Sule and Hvidvinget Terne have been recorded. Vandrikse is often encountered at the Markfield inflow and the single Plettet Rørvagtel record was in this area.
With past records of Dværghejre, Hedehøg, Rovterne and Triel, Thornton has produced some good county rarities. More recently Hvidøjet And, Nathejre, Havlit, Kohejre and Skestork have been added. Grey-headed Wagtail, a Leicestershire first and Karmindompap, a Leicestershire and Rutland first, have also been recorded.
Details
Access
Thornton Reservoir lies to the east of the village of Thornton. The main car park is located at SK470074. A gravel path allows visitors to walk around the reservoir, a distance of 2.7 miles. Click on the P in the map to get directions.