Overview
The Castletown River – known in its upper reaches as the Creggan River – is a 30 km waterway that rises near Newtownhamilton in County Armagh and flows south‑east to the Irish Sea at Dundalk Bay. In Dundalk town the river bisects the urban core, forming a natural spine that links the historic centre with the tidal estuary. Its clear, fast‑flowing waters support thriving populations of wild brown trout, sea trout and Atlantic salmon, while the expansive flood‑plain and estuarine mudflats attract waders, ducks and gulls.
Just on the outskirts of Dundalk, the stone‑arch Toberona Bridge (locally St John’s Bridge) spans the river at Toberona. Built around 1840, the single‑arch masonry bridge is owned and maintained by Louth County Council and sits beside the historic St John’s Well, creating a quiet riverside tableau prized by photographers.
History / Background
The river’s name reflects the medieval settlement of Castletown, a fortified borough that grew up on its banks in the 12th century. Over the centuries the water powered small mills and served as a transport route for agricultural produce. In the 19th century sport fishing took hold, and the Castletown quickly earned a reputation as a premier trout river – a status still upheld by local angling clubs.
Toberona Bridge was erected during the mid‑Victorian boom in infrastructure (c. 1840). Local stonemasons cut limestone voussoirs to form the graceful single arch, a design typical of early‑Victorian Irish bridges. Though modest compared with larger feats such as the Boyne Viaduct, it has remained a vital crossing for more than 180 years, linking Dundalk with the surrounding countryside and forming part of a network that includes Ballybinaby, Fords, Bellews (Coffin) and the modern M1 bridge.
What to See & Do
Angling
The stretch downstream of Toberona Bridge is renowned for its runs of sea trout and salmon, while brown trout abound throughout the river. The prime fishing window runs from July to September. Anglers must follow Angling Bye‑law No. 982 of 2020, which requires single or double barbless hooks and bans worm bait for all species.
| Species | Recommended Flies |
|---|---|
| Brown Trout | Hares Ear, Black & Silver Spider, Klinkhammer Special, Olive patterns |
| Sea Trout | Teal, Blue & Silver, Black Pennell, Butcher, Alexander, Peter Ross, Connemara Black |
| Salmon | Green Highlander, Colley Dog, Ally Shrimp, Bann Special Shrimp, Orange & Gold Shrimp |
Permits are issued by the Dundalk and District Brown Trout and Salmon Anglers Association (online portal) and a State licence is also required. Day permits are available for visitors, and catch‑and‑release is encouraged to sustain the river’s stocks.
Bird‑watching
At its mouth the river widens into Dundalk Harbour, a tidal bay that is a hotspot for waders and waterfowl. A well‑marked path runs from Newry Road to Tain Bridge, offering close views of gulls, ducks and the occasional Forster’s Tern in summer. Continuing from Tain Bridge to Dundalk Docks, walkers can explore the exposed mudflats at low tide – prime feeding ground for curlews, oystercatchers and other shorebirds. The Navvy Bank Walk follows the estuary to Soldiers Point, where river and sea meet and bird activity peaks.
Water sports
The river’s gentle gradient and clear water make it popular with local kayakers and canoeists, especially in the lower reaches near the bridge. While there are no formal launch points, anglers and walkers often spot paddlers launching from the riverbank near the car park.
Architectural Appreciation
St John’s (Toberona) Bridge invites a leisurely stroll along its parapet to admire the smooth curvature of the arch, the neatly dressed stone voussoirs and subtle corbelling that support the roadway. Its low profile offers unobstructed views of the river’s gentle flow and riparian vegetation. Photographers will find the bridge especially rewarding at sunrise, in the golden light of autumn, or at low tide when the riverbed is exposed, creating reflective surfaces that double the visual impact.
Wildlife & Seasonal Highlights
Beyond the well‑known trout and salmon, the Castletown River supports a healthy otter population and a variety of freshwater invertebrates, which in turn attract kingfishers during the warmer months. The estuarine mudflats are a key stop‑over for migratory waders in spring and autumn; timing a visit with low tide between March and September maximises the chance of seeing curlews, redshanks and the occasional little tern. Summer evenings often bring swifts and swallows that feed over the river’s surface.
Nearby historic site
A short drive north‑west of the bridge lies Dún Dealgan Motte (also known as Cú Chulainn’s Castle). Perched on a ridge overlooking the Castletown River, the motte is linked to the legendary hero Cú Chulainn and offers panoramic views of the surrounding countryside. Parking is limited and the entrance can be easy to miss, so allow extra time if you plan to visit. While you’re in the area, consider a detour to Castle Roche, a 13th‑century stone castle with impressive views across the Cooley foothills.
Getting there
The bridge is accessed via a local road just off the M1 (Exit 13) and is a short walk from Dundalk town centre. A small roadside car park with a few free spaces is available directly beside the bridge; facilities are basic (no lighting or CCTV). Visitors are advised to arrive early in busy periods.
Public transport – Bus Éireann route 188 (TFI Local Link) stops on Newry Road, a 10‑minute walk from the bridge. The nearest train station is Dundalk railway station on the Dublin‑Belfast line, about a 15‑minute walk away.
Nearby attractions
While exploring the Castletown River, consider a short drive to the impressive ruins of Mellifont Abbey, Ireland’s first Cistercian monastery, or head east to the coastal village of Baltray, renowned for its bird‑watching cliffs and golf links.
Practical Information
- Location: Toberona, just outside Dundalk town centre, County Louth.
- Access: Reachable by car via the M1 (Exit 13) or on foot from the town centre via the river walk. Parking: a small roadside car park with limited free spaces is available beside the bridge.
- Best times to visit:
- Angling: July‑September (peak salmon and sea‑trout runs).
- Bird‑watching: Low tide during spring and summer for mud‑flat feeding; early mornings increase chances of spotting waders.
- Photography: Early morning or late afternoon in autumn for soft light and reflective water.
- Permits & licences: Angling permits from the Dundalk and District Brown Trout and Salmon Anglers Association (online) plus a State fishing licence. No special permits are required for walking, bird‑watching or water‑sports.
- Facilities: The river walk is well‑signposted; nearby amenities in Dundalk include cafés, public toilets and information boards about the river’s wildlife.
- Conservation: Visitors are asked to respect the Bye‑law regulations, keep to the paths, and avoid disturbing nesting birds on the mudflats.
Enjoy the blend of natural beauty, historic engineering and outdoor recreation that makes the Castletown River and Toberona Bridge a standout destination on the Irish east coast.