Overview
Despite its name suggesting a mere trickle, the Six Mile Water is a substantial 26-mile (42 km) waterway that shapes much of County Antrim’s eastern landscape. Rising in the hills west of Larne and north of Carrickfergus, it winds past a string of historic towns and villages – Ballynure, Ballyclare, Doagh, Templepatrick, and Dunadry – before finally meeting the vast expanse of Lough Neagh in Antrim town.
For visitors, the river offers a quiet counterpoint to the busy coastal routes. Its gentle flow and well-maintained banks make it an ideal spot for a relaxed walk, a session of fly fishing, or simply watching the water move past centuries of mill ruins and manicured gardens. The most accessible section runs through the grounds of Antrim Castle, where the river meets carefully restored 17th-century canals and Victorian pleasure gardens.
A River with a Story
The name “Six Mile Water” comes from a practical piece of medieval military maths. Norman soldiers marching from Carrickfergus Castle used to calculate their progress by the distance to the nearest ford. When they reached the crossing point near modern-day Ballyclare, they had covered exactly six miles. Before that, the river was known locally as the Ollar, meaning “river of the rushes” in Irish.
Over the centuries, the waterway powered the local economy. You can still trace the footprint of industry along the Upper Town stretch, where ruins of Graingers Mill, a historic flax mill at Thorer’s Stretch, and an old fur mill sit quietly among the trees. Today, the river’s most prominent historic neighbour is Antrim Castle Gardens. The 400-year-old estate, home to the Massereene family, features a 12th-century motte that rises dramatically beside the water, marking centuries of continuous settlement.
Walking the Banks
You don’t need to be an avid hiker to enjoy the Six Mile Water. The routes are flat, well-signposted, and largely traffic-free.
Antrim Castle Gardens & Lough Neagh River Walk
Starting from the Lough Shore car park, this shared walking and cycling path stretches about 1.4 miles (2.3 km) north-east along the river. The trail passes through willow-lined banks and opens into the formal gardens of Antrim Castle. It’s fully wheelchair accessible and features frequent resting points, making it suitable for families with young children or visitors with reduced mobility.
Six Mile Water River Park – Ballyclare
Further upstream, the Ballyclare loop offers a 2.3 km circular walk that begins at the car park off Mill Road. The route follows the winding riverbanks, passes a small duck pond, and cuts through open fields. It’s rated as an easy half-hour stroll, perfect for a quick mid-morning break. Dogs are welcome on leads throughout both routes.
From either trail, you can easily extend your day by connecting to the Antrim Loughshore Walk, heading west to the Toome Canal viewpoint, or linking up with nearby woodland paths in Tardree Forest and Ballyboley Forest.
Angling on the Six Mile Water
Fly fishermen and coarse anglers know this river as one of Northern Ireland’s most reliable fisheries. The Antrim & District Angling Association (A&DAA) manages the waterway and issues day permits, which can be purchased online at their dedicated site.
The river supports a healthy population of brown trout, salmon, and the native dollaghan (a sea-run brown trout). Anglers typically target four main sections:
- Lower Town stretch – Runs through the Clotworthy House gardens, under Deerpark Bridge, and out to the Lough shore. The water is wider and deeper here, with convenient parking nearby.
- Upper Town stretch – Winds past Graingers Mill, under Muckamore Bridge and the historic “Arches”, then follows the Mill Race Trail. This section offers more varied flow and historic scenery.
- Summerhill to Dunadry – A quieter, rural stretch featuring deep pools and views of a historic fort site at Dunadry.
- Templepatrick stretch – Runs alongside agricultural fields and a local golf club, with well-maintained stiles giving access to the banks.
Anglers are asked to stick to designated footpaths, practice catch-and-release where appropriate, and carry a valid permit at all times.
Wildlife & Nature
The slow-moving sections of the river create ideal habitat for birds and mammals. Keep an eye out for kingfishers flashing along the willow branches, grey herons standing motionless in the shallows, and red-breasted mergansers riding the current. Otters are regularly spotted along the lower reaches, leaving tell-tale spraints on the muddy banks.
Botanically, the Six Mile Water holds a unique distinction: it is the only place in Ireland where the fast-water specialist river water-crowfoot (Ranunculus fluitans) grows naturally. Its long, emerald leaves form a submerged carpet that plays a crucial role in the river’s ecosystem. The plant is legally protected, and local conservation groups, including volunteers from the angling community, actively monitor water quality and run habitat-enhancement projects like installing salmon boxes and maintaining natural riffles.
Practical Information
- Opening Hours – The gardens and river walk are open Monday–Friday 09:30–17:00 and Saturday–Sunday 10:00–17:00 (2026 season).
- Admission – Free entry to the gardens, river walk, and public footpaths.
- Parking – Three free car parks are located off Randalstown Road, plus the Lough Shore car park. Disabled bays and EV charging points are available.
- Accessibility – Accessible toilets and 2-metre-wide pathways in the Sensory Garden make the site highly navigable. A detailed access guide is available here.
- Fishing Permits – Day tickets and memberships are sold through the A&DAA Six Mile Water site.
- Pet Policy – Dogs are welcome on all public footpaths but must be kept on a leash.
- Facilities – Public toilets, picnic areas, and Mann’s Garden Kitchen café are located within the Antrim Castle Gardens complex.
- Getting There – The main gardens entrance is on Randalstown Road (BT41 4LH). From Belfast, follow the A26 north to Antrim and signpost to Randalstown Road. Local bus services reach Antrim town centre, from where a short taxi ride or 15-minute walk brings you to the entrance. For the Ballyclare loop, take the A26 north to Ballyclare and follow signs to the Mill Road car park.
The river walk is entirely self-guided, but ranger-led tours of the gardens run throughout the year and often coincide with seasonal events like the St Patrick’s Day celebrations. Check the official Antrim Castle Gardens website for the latest programme dates.
If you are planning a fishing trip, arrive early to secure a good peg on the Lower Town stretch, and remember to book your A&DAA permit in advance during the spring salmon run.