Overview
The Castletown River (Irish: Abhainn Bhaile an Chaisleáin) is a roughly 30 km waterway that rises near Newtownhamilton in County Armagh and flows south-east into the Irish Sea at Dundalk Bay. In its upper reaches it is known as the Creggan River, gathering water from tributaries like the Kilcurry and Falmore before cutting through the heart of Dundalk. Historically, the river powered local mills and served as a transport route for agricultural goods, but today it is best known for its regulated sport fishing, accessible riverside paths, and the tidal estuary that draws birdwatchers from across the east coast.
Angling
The Castletown is managed by the Dundalk & District Brown Trout & Salmon Anglers Association, one of Ireland’s oldest fishing clubs, established in 1926. The association maintains a clubhouse directly on the riverbank and oversees strict conservation measures to protect wild stocks.
Important note for visitors: the Castletown River is currently closed to salmon fishing. Angling is permitted for brown trout and sea trout from 1 March to 12 October. A daily bag limit of two trout applies, with size restrictions in place to protect breeding stocks: brown trout under 28 cm and over 35 cm must be returned, while sea trout under 30.5 cm and over 40 cm must be released.
All anglers must comply with Angling Bye-law No. 982 of 2020, which mandates the use of single or double barbless hooks and prohibits worm bait. Catch and release is strongly encouraged. Permits are available through the club’s online portal, and a valid State fishing licence is required. The stretch downstream of Toberona Bridge holds some of the river’s deepest pools and is particularly productive after spring floods.
Birdwatching & Estuary Walks
Where the river meets the sea at Dundalk Harbour, the landscape opens into a wide tidal estuary that is a recognised hotspot for coastal and migratory birds. A well-maintained path runs from Newry Road to Tain Bridge, offering clear views of the waterline. At low tide, the exposed mudflats become a feeding ground for curlews, oystercatchers, redshanks and various gull species.
Continuing past Dundalk Docks, the Navvy Bank Walk follows the estuary to Soldiers Point, where freshwater and saltwater mix. This transition zone attracts kingfishers in the summer months and is a regular summer residence for the Forster’s Tern. Visitors are advised to consult Dundalk Bay tide tables before heading out, as low tide exposes the best viewing areas and safe walking routes across the flats.
Toberona Bridge & Riverside Walks
Just outside Dundalk’s urban centre, the single-arch Toberona Bridge (often called St John’s Bridge) spans the river in a quiet, wooded setting. Built around 1840 during a period of Victorian infrastructure development, the bridge is constructed from local limestone with carefully dressed voussoirs forming its graceful curve. Louth County Council maintains the structure, which sits beside the historic St John’s Well.
The bridge is a popular starting point for short walks along the riparian path. The surrounding bank is lined with mature trees and native undergrowth, providing a shaded corridor that connects the town to the wider floodplain. Photographers often visit at dawn or during the autumn months when the low sun catches the stone arch and the water runs clear and slow.
Practical Information
- Location: Toberona, just outside Dundalk town centre, County Louth.
- Access: Reachable by car via the M1 (Exit 13) or on foot from Dundalk. A small roadside car park with limited free spaces sits beside the bridge.
- Permits: Required for angling. Book online via the Dundalk & District Brown Trout & Salmon Anglers Association and ensure you hold a current State licence.
- Best times to visit:
- Angling: March to October, with peak activity often following spring or early summer rains.
- Birdwatching: Low tide in spring and summer for mudflat feeding; early mornings reduce disturbance to nesting birds.
- Facilities: Basic roadside parking near the bridge. Public amenities, including toilets and cafés, are available in Dundalk town centre, a short walk or drive away.
- Conservation: Please stick to marked paths, keep dogs under close control near bird nesting areas, and strictly follow hook and bait regulations when fishing.
Nearby Attractions
A short drive from the river leads to several historic and natural sites. Mellifont Abbey, Ireland’s first Cistercian monastery, sits in a wooded valley just to the south. For coastal walks and additional birdwatching, the cliffs and dunes at Baltray are easily accessible from Dundalk Bay. Further afield, the medieval ruins of Castle Roche offer panoramic views across the Cooley foothills and a glimpse into Louth’s Norman heritage.
Check the Dundalk Bay tide tables before visiting the estuary, and book your angling permit online a few days in advance during the summer months to secure your preferred fishing slot.