What the dam replaced
When engineers dammed the River Erne here in the early 1950s, they drowned Assaroe Falls – a waterfall that had drawn people for centuries – along with the 14-arch 17th-century bridge, Camlin Castle, and a scatter of houses with names like Stonewold, Laputa and Cliff House. What replaced them is Cathaleen’s Fall, the larger of the two stations on the Erne Scheme and, at the time, the first major infrastructure project the Republic and Northern Ireland had built together since partition.
That political weight is the real story of the place. The scheme was championed on one side by the Northern prime minister Basil Brooke and on the other by Seán Lemass, then the Republic’s Minister for Industry and Commerce – two men who agreed on very little else. If you only have time for one thing here, it’s the free guided tour of the generating hall; the exterior alone doesn’t repay a long detour.
History and construction
The idea of damming the Erne had been floated in the 1920s, but work did not begin until 1946. Over the next few years crews excavated some 600,000 m³ of earth and rock to cut the 6 km Belleek Channel and a 1.37 km tailrace below the falls, then raised a concrete gravity dam 257 m long and 27 m high with three spillway gates, each about 7.9 m (26 ft) across. The first of two Kaplan turbines came online in November 1951, the second in 1952, and the plant was declared operational on 1 October 1952. The dam itself was finished in 1955.
The two 22.5 MW turbines give a combined capacity of 45 MW and an average output of about 206 GWh a year – enough, by one contemporary estimate, for more than 20,000 homes. Cathaleen’s Fall remains Ireland’s second-largest hydro complex after Ardnacrusha on the Shannon.
Inside the generating hall
The generating station is the reason to book a tour. It’s a confident piece of mid-century modernism: a flat-roofed block with horizontal strip windows and no decorative cladding, capped inside by a glass roof that pours daylight onto the machinery. A curved, cantilevered concrete staircase sweeps between the levels, and the light shifts across the atrium through the day. The separate entrance building, where the exhibition now sits, is done in an earlier art-deco style.
Tours are led in small groups through the exhibition and on into the control room, where old panels sit beside modern monitoring kit. The displays cover the construction, the cross-border politics, and the effect on the Erne Valley communities whose land and landmarks went under the water.
The fish pass and hatchery
Power and river ecology run side by side here. A submerged-orifice fish pass, with slots sized for elvers, lets salmon and eels get past the dam. The on-site hatchery releases roughly 500,000 salmon smolts a year and traps around 4 million elvers to protect juvenile stocks. Interpretive panels explain how flow rates and turbine operation are balanced against the seasonal migration. Come between March and June and, water levels permitting, you may catch the spring salmon run.
The Weir
The weir at Cathaleen’s Fall was used to stand in for the setting of Conor McPherson’s play The Weir – a small literary footnote to an otherwise resolutely industrial site.
Visiting
One honest caveat: the tour programme is not reliable. Free public tours ran here in the spring and early summer of 2016, but there’s no dependable published schedule since, so treat the listed Tuesday–Friday hours as a starting point only and confirm directly with the ESB before you build a day around them. Book ahead through the ESB education portal, as groups are small.
Allow about 90 minutes for the exhibition and guided walk-through. The generating hall runs cooler than outside, so bring a light layer and comfortable indoor shoes. The main exhibition area is wheelchair-accessible; the curved staircase is not, but staff can arrange an alternative route.
Getting there and parking
The station is on the Belleek Road at Townparks, just off the N15 where it crosses the Erne east of Ballyshannon. It’s a short walk from the Ballyshannon bus stop (Bus Éireann routes 64 and 370) and the town car park. There’s free on-site parking for tour groups, with a few visitor spaces first-come, first-served. Coming from further afield, the nearest railway station is Sligo, about 30 km away, with a bus or hire car on from there.
Nearby stops
- Ballyshannon – reckoned Ireland’s oldest town, with a historic bridge and riverside walks.
- Assaroe Falls and Abbey – the drowned waterfall and monastic site, now beneath the reservoir.
- Camlin Castle – ruins of the 17th-century house cleared for the dam.
- Ardnacrusha – Ireland’s first large hydro station, on the Shannon in County Clare.