Bohernabreena Reservoir

Overview

Nestled in the heart of the Glenasmole Valley, about 15 km southwest of Dublin city centre, Bohernabreena Reservoir is a striking pair of lakes framed by a mix of evergreen and deciduous woodlands. Managed by Dublin City Council, the reservoirs form a vital part of the capital’s water supply, feeding roughly 35,000 households in South Dublin. The site sits on the border between the Dublin Mountains and Wicklow National Park, offering sweeping views of peaks such as Seefingan, Corrig and Kippure. The surrounding landscape is a designated Area of Special Conservation, home to rare orchids, molinia meadows and a variety of birdlife, making it a haven for nature lovers.

History & Background

Construction of the Bohernabreena Waterworks began in the 1880s and was completed by 1887. The twin reservoirs were created to serve three primary purposes: provide a reliable drinking‑water source, supply water to the numerous mills that once dotted the Dodder valley during the Industrial Revolution, and offer flood‑control for an area historically prone to flooding. Water from the upper lake – sourced from non‑peaty slopes – flows through a stone‑lined channel into the lower, more peaty lake before continuing on to the treatment works at Ballyboden, 7.5 km away.

The valley itself was carved by glaciers during the last Ice Age, leaving a dramatic U‑shaped profile that still defines the terrain today. Along the western shore of the upper reservoir lies the historic St Ann’s graveyard, the remnants of a church that served the local community until the mid‑16th century. The graveyard is accessible via the Dublin Mountains Way’s yellow way‑markers, offering a quiet spot to reflect on the area’s long‑standing human presence.

What to See & Do

Walking Trails

• Upper Reservoir Loop (8.5 km) – An easy‑going circuit that starts at the Bohernabreena North Car Park. The trail follows the road alongside the Dodder, passes the lower reservoir, then loops around the upper lake, showcasing the stone‑faced channel and offering several viewing points of the surrounding mountains. The route is way‑marked in orange and takes roughly 60‑90 minutes.
• Lower Reservoir Loop (≈4 km) – Also known as the “short walk,” this loop begins at the paid upper‑lake car park. It circles the lower lake, passes the historic St Ann’s graveyard, and returns via the same road. The walk typically lasts 1‑1.5 hours and is favoured for its compact length and varied scenery.
• Dublin Mountains Way – A national way‑marked trail that threads through the reservoir’s shoreline, linking Bohernabreena to the wider network of Dublin‑mountain walks.

Wildlife & Angling

The reservoirs support a modest fishery, with trout being the dominant species. Fishing is permitted by licence only, obtainable from local angling clubs. Birdwatchers can spot kingfishers, dippers, grey wagtails, herons and moorhens along the water’s edge.

Picnic & Relaxation

Designated picnic spots are scattered around both lakes, providing tranquil settings for a midday break. While there are no permanent toilet facilities on the site, the newer €5 car park includes a small coffee kiosk that operates on weekends, perfect for a quick refreshment.

Getting There

By Car – From Dublin city centre, take the N81 towards Tallaght, exit at Oldbawn (R113), turn right onto Bohernabreena Road (R114) and follow the signs to the waterworks. The site is sign‑posted and easy to locate via GPS.

Public Transport – The nearest bus stop is [insert stop name] on the [insert route number] service, a short walk from the car‑park entrance. (Please verify current bus routes and timetables.)

Practical Information

Parking

Opening Hours – The reservoir park is open year‑round with unlimited access; there are no formal opening or closing times. (Confirm no seasonal restrictions.)

Admission – Free entry to the walks and picnic areas.

Dog Friendly – Dogs are permitted on the walking routes but must be kept on a lead near the water’s edge and wildlife. (Please confirm current policy.)

Contact – Phone: +353 86 882 8415 (local information line).

Website – For up‑to‑date maps and additional details, visit the Irish Road Trip guide: Bohernabreena Reservoir Walk. (Official Dublin City Council page to be added.)

Navigation Links

• Google Maps location
• Upper Reservoir Loop PDF (Dublin Mountains Partnership)

Nearby Attractions – After your walk, consider a short drive to Cruagh Wood for additional forest trails, the lakeside town of Blessington for a bite to eat, or the Ticknock Fairy Castle walk for expansive views of Dublin Bay.

Facilities – The site offers car parking, picnic areas, marked walking trails, a nature trail, and running tracks. No permanent restroom facilities are available on the immediate reservoir grounds.

Seasonal Highlights

• Spring – The surrounding meadows burst into colour with wild orchids and other alpine flora, making the lower loop especially photogenic.
• Summer – Longer daylight hours provide ample time for extended hikes and bird‑watching; kingfisher activity peaks.
• Autumn – The woodlands display rich amber tones, and the reservoir’s surface often reflects the changing foliage.
• Winter – While the paths can be brisk, the stark landscape offers dramatic views of the Dublin Mountains.

Wildlife Highlights – Keep an eye out for kingfisher darts over the water, the occasional trout surfacing, and the seasonal bloom of wild orchids in the surrounding meadows.

Historical Points – The stone‑lined channel linking the two lakes, the overflow system at the upper reservoir, and the ruins of St Ann’s graveyard provide tangible links to the valley’s industrial and ecclesiastical past.

Enjoy a peaceful day exploring Bohernabreena Reservoir, where natural beauty, gentle history and easy walking routes combine to create a quintessential Dublin‑area outdoor experience.