We have been in discussion with all affected local authorities and Natural Resources Wales and a fuller picture will emerge over the next few weeks as engineers conclude their assessments.
Buom yn trafod gyda’r holl awdurdodau lleol perthnasol a Cyfoeth Naturiol Cymru ac fe gawn ddarlun llawnach dros yr wythnosau nesaf wrth i’r peirianwyr gwblhau eu hasesiadau.