Currently, infected crayfish have been identified in five locations; the River Bruskey in Counties Cavan and Longford, River Suir in Counties Waterford and Tipperary, River Barrow in Counties Kilkenny and Carlow, River Deel in Co. Limerick and the Lorrha River, Co. Tipperary.
Information about crayfish plague, including important steps that can be taken to reduce the likelihood of spreading the disease, is available at
http://www.biodiversityireland.ie/projects/invasive-species/crayfish-plague/
A recently (31/10/2017) updated map showing the known distribution of White-clawed Crayfish in Ireland and the location of infected catchments is available at
http://www.biodiversityireland.ie/wordpress/wp-content/uploads/Crayfish-National-map-20171031.pdf