CMaps & Plans 49/1-10 were deposited with the modern records service of Gwynedd Archives & Museums Service post 1974, when the UDCs and RDCs were abolished. They were catalogued along with other documents created by Llanrwst Council by a student on the Archives Diploma course at Bangor University, and transferred to Conwy Archive Service in 2000.
Plans 11-13 were an additional deposit in 2004, that were inherited from Gwynedd's modern records function, found intermixed with Llandudno UDC plans. They had not been previously catalogued.