3,123 patients were without a bed this week, throughout Ireland's hospital system.
According to the Irish Nurses' and Midwives' Organisation figures, 548 people were waiting on trolleys yesterday - 16 of whom were children.
University Hospital Limerick the worst affected hospital nationwide, with 79 people waiting for beds.
39 people were waiting on trolleys at St. James' Hospital, with 38 at Vincent's Hospital.
General Secretary of the INMO, Phil Ní Sheaghdha, noted over the past two weeks there hasn't been a day without trolley figures below 545.
“The INMO has long been raising our concerns about the devastating impact this level of overcrowding is having on nurses and their patients with all levels of HSE management. It is clear that the current approach to tackling hospital overcrowding is not working.
“The HSE and Department of Health need to stop treating runaway hospital overcrowding as a surprise, this level of overcrowding was and is entirely predictable. Post bank holiday backlogs are not new, they happen each time and it is clear that many hospitals are not preparing properly.
“Our members have made it clear they cannot continue to work in these conditions year-round with absolutely zero reprieve. Real, tangible action must be taken to radically reduce hospital overcrowding.
“We have sought an urgent meeting with the new HSE CEO to discuss new approaches that can be taken in light of his recent comments on the winter plan process. Overcrowding has become a year-round problem and it is our view that we now need a year-long plan with multi-annual funding.”