Overview
The Lyreen is only about six kilometres long, but it runs right through the middle of Maynooth, past the castle, through the university grounds and out to meet the Rye River east of town. Its Irish name, An Laidhrín, is a diminutive of ladhar, “fork”, which suits a river that pulls itself together from several small streams near Corcoranstown before it amounts to much. Nobody drives to Maynooth for the Lyreen. But if you’re already here for the college or the castle, following the water is the pleasantest way to see the town.
Following the river
The walk isn’t one waymarked trail so much as the river itself. Start at the small public space on Pound Lane, just off Main Street, where the Lyreen slips past back gardens and under footbridges before it enters the grounds of St Patrick’s College and the South Campus of Maynooth University. If you’ve only twenty minutes, walk this stretch: it’s flat, paved in places, and the quietest green corridor in a busy commuter town.
By the town centre the river passes the 12th-century ruins of Maynooth Castle, which sits right at the meeting of the Lyreen and the Joan Slade (or Owenslade). Downstream it bends away toward the Carton Demesne, past a set of fishing ponds, and finally joins the Rye east of the town.
The mill race and the river’s history
The Lyreen has been put to work for a long time. The Anglicised name “Leyrin” turns up in the Civil Survey of 1654–56, but the river was driving mills well before that. Within the college grounds a mill race still splits from the main channel, the same cut that once powered the Manor Mills, and rejoins the river between the college and the Manor Mills Centre. The mills are gone; the race is a quiet reminder of what the water used to do.
The river shaped the town in smaller ways too. The Joan Slade, which joins near the castle, long served as a boundary and a crossing point, while the Meadowbrook and Maws streams fed in from the south and east. Today the Lyreen is stitched into the town’s fabric, with modern housing like the Lyreen Manor apartments built along its banks and public walkways kept open beside the water.
Fish and wildlife
A 2011 survey turned up seven fish species in the Lyreen, most commonly minnow, brown trout and stone loach; the Baltracey tributary held four, mostly stickleback. That same survey rated the river’s ecological status as “moderate”, which is honest, ordinary small-river water rather than a pristine trout stream. Watch the slower, reed-lined stretches and you might catch a kingfisher, and the wooded college grounds and the nearby Carton House estate bring in waterfowl and woodland birds.
For anglers, don’t come expecting a managed fishery on the Lyreen itself. A coarse and carp fishery was built where the Lyreen meets the Rye, adding two ponds to an existing one, but the old Lyreen Angling Centre (later Meadow Lodge Fisheries) appears to have closed. Most local fishing now happens on the Rye Water or the Royal Canal through the town, both good for coarse species like bream, tench and rudd.
Practical information
- Getting there: Maynooth is about 25 km west of Dublin, off the M4 at Junction 7, and on the Irish Rail Western Commuter line from Dublin Connolly. The riverside walk starts a few minutes from the station.
- Access: Free and open, with the easiest entry points on Pound Lane and along the university campus perimeter.
- Parking: Street parking around the college and near Pound Lane, plus pay-and-display bays on the main road near the town centre.
- Facilities: No visitor centre on the river; toilets and cafés are in Maynooth town centre and at the Carton House estate.
- Safety: The Lyreen rises quickly after heavy rain, and the council has flagged flood risk near the low bridges and the M4 underpass. Stay on the paths and keep children back from the edge after wet weather.
If you want the best of it in one go, walk from Pound Lane to the castle and on into the South Campus. That half-mile takes in the mill race, the ruins and the quietest part of the river, and drops you back near the cafés on Main Street.