Uisce Éireann Issues Public Safety Warning Over Swimming at Carrigtwohill Reservoir

Uisce Éireann is urging the public to stay out of Tibbotstown Reservoir in Cloneen, Carrigtwohill, Co. Cork, warning that swimming, diving, or jumping into the reservoir is extremely dangerous and strictly prohibited.

During the recent period of warm weather, a number of incidents have been observed involving individuals climbing onto the dam structure and valve tower and jumping into deep water. Uisce Éireann says this behaviour poses a serious and immediate risk to life.

The utility has set out the activities that are strictly prohibited at the site. These are entering the water, whether swimming or wading; diving or jumping from any structure; and climbing fences or accessing restricted areas.

Uisce Éireann is asking parents and guardians to remind young people of the dangers, and to respect all safety signage and barriers in place at all reservoir sites.

The warning stresses that reservoirs are not recreational areas. They are industrial and operational water infrastructure sites with serious, often hidden hazards and constantly changing conditions.

Among the key dangers, the utility points to hidden infrastructure beneath the surface, including submerged plant, valves, pipework, and operational infrastructure that are not visible from the surface and can cause serious injury or death on impact.

It also warns of strong and unpredictable currents, noting that draw-off points and outlet structures can create powerful underwater currents capable of pulling swimmers below the surface, pinning them against structures, or preventing resurfacing.

On depth, Uisce Éireann states that water depths exceed 12 metres in places, and that sudden immersion can lead to cold shock, panic, and disorientation, significantly increasing the risk of drowning.

The utility further highlights dense aquatic vegetation, with heavy weed growth near the dam wall capable of entangling swimmers and the potential to trap them below the surface. It also warns of the severe risk from a fall from height, as jumping from the dam crest or valve tower roof involves significant height and carries a high risk of serious injury, including spinal damage and impact trauma.

Uisce Éireann adds that the dam and valve tower are critical infrastructure. Climbing or accessing these areas is dangerous and unauthorised, posing a risk to both personal safety and the water supply system.