The reservoir was created in the early 1970s by impounding the River Cuckmere.
It is a primary site for scientific research into the movement of migratory birds in East Sussex.
The reservoir floor sits on Weald Clay, which provides a natural impermeable base for water retention.
The water levels are strictly managed by South East Water to ensure the supply remains sustainable during drought periods.
The site hosts a specific variety of dragonflies and damselflies due to the abundance of marginal aquatic vegetation.
Arlington Reservoir is a 240-acre freshwater site owned and managed by South East Water, serving as a key drinking water supply for the region. The site features a perimeter path of approximately 2.5 miles suitable for walking and birdwatching. It is designated as a Local Nature Reserve and supports a diverse range of aquatic and woodland habitats. The reservoir's banks are populated by willow and alder trees, providing nesting sites for various waterfowl and raptor species. Visitors can observe significant populations of great crested grebes and cormorants throughout the year. The reservoir functions as a managed ecosystem, balancing water storage requirements with public recreational access. Its layout includes designated fishing zones and specific areas restricted to protect local wildlife populations.
The viewing bank near the main entrance provides the most expansive panoramic view across the water toward the Cuckmere Valley.
Bring binoculars as the birdwatching hides are located at prime viewing distances from the water's edge.
Check the official South East Water portal before visiting to ensure path access is not affected by reservoir maintenance.
Carry high-quality insect repellent if visiting during the humid summer months.
Do not attempt to swim or kayak in the water as it is a protected reservoir used for public drinking supply.
Keep dogs on a lead to protect ground-nesting birds; do not enter restricted wildlife zones; take all litter home.
