|Location Map ( geo)|
|To:||Bryn Maenllifo (SH815395)|
|Distance:||7.7 miles (12.4 km)|
|Now part of:||A4212|
|Route outline (key)|
The B4470 is listed in Department for Transport road lists as Reserved for new Class 2 road. (Trawsfynydd - Cwm Prysor - Bryn Maen.), making it a rural road in north Merionethshire. This road came into being in the 1960s when a previously existing minor road and track were upgraded to form a through route from the then-A487 to the B4391 and the controversial new reservoir at Llyn Celyn whose building was a catalyst for the construction of the B4470.
The road was short-lived, being renumbered A4212 in 1968.