Overview
Two things bring people up the hill at Portroe: a flooded slate quarry the colour of blue Curaçao, and a lay-by on the R494 with one of the best views of Lough Derg in north Tipperary. The village itself (An Port Rua, ‘the red port’) is a quiet crossroads of about 460 people, 2 km back from the lake and 11 km west of Nenagh, spread across the townlands of Garrykennedy, Glencrue and Shesharoe. It makes a handy base for the Arra Hills and the shore, but the two draws are what people drive up for.
The Lookout
The simplest stop, and free, is the Lookout on the R494 between Portroe and Ballina. There is a lay-by with picnic tables and map boards, and a wide view over Lough Derg opening out below. If you are driving the Nenagh–Killaloe road and only have five minutes to spare, this is the one to pull in for.
Portroe Quarry
The quarry sits above the village, a disused slate working that filled with clear spring water into a deep, sapphire-blue pool, and it has become one of Ireland’s better-known inland dive sites. It opened as a dive centre in 2010; the water is cold year-round and reckoned to be around 39 metres deep, with good visibility on a calm morning. Divers train around features set on the bottom: sunken cars, a boat wreck and relics of the old slate workings.
Access is the catch. The walk-in commercial operation has since wound down, and diving is now organised through affiliated clubs such as the Lough Derg Sub Aqua Club, for members with the right qualifications; expect a day fee of around €20, or €10 after 2pm, at the time of writing. This is deep, cold water with submerged hazards, so swimming, scrambling around the cliff edges or entering without gear, training and club supervision is genuinely dangerous and not permitted. If you only want the view, the old entry ramp vanishing into the blue makes the photograph, and morning gives the stillest water.
History and heritage
The area is older than the village. Archaeological surveys in the townlands of Garrykennedy, Lisheenbrien and Lisheentyrone have turned up standing stones, rock art, ring forts and a ruined tower house. In the village, St Mary’s Roman Catholic Church dates to 1872, and a former Royal Irish Constabulary barracks of around 1830 still stands at the top of the hill, one of the few early-19th-century police buildings left in the district. On Loughtea Hill, a 20-metre stainless-steel cross catches the light for miles; it went up in 2002 for the millennium, replacing an earlier cross raised after the 1932 Eucharistic Congress in Dublin.
Community and local life
For a village this size, the sporting calendar is busy. Portroe GAA, formed in the 1880s, won its first North Tipperary senior hurling title in 2012, and its best-known name is Liam Sheedy, who played his club hurling here and twice managed the Tipperary senior hurlers; the club fields camogie sides too. Scoil Mhuire, the national school, had 128 pupils in 2025. The big date is the Portroe Vintage & Parish Day in August, a farmland fundraiser for North Tipperary Hospice with vintage tractors, old crafts like blacksmithing and butter-making, and live music.
Getting there
Portroe is off the R494, reached from the M7/N7 by way of Nenagh. Bus Éireann route 323 stops at Portroe cross, at the bottom of the village, on the Limerick–Nenagh run. There is free parking near the village centre; for the quarry, access is through the diving clubs rather than a public car park.
If you are only passing through, skip the quarry, which is for qualified divers, and pull in at the Lookout instead. The Lough Derg shore is a short drive west if you want to make longer of it.