OSBM Bolt   

OSBM Bolt on bridge at NE angle, SE side of road, 27' N from N bank of Afon Ddu.

Location
Grid reference: SN 6680 9389.
Landranger 135: Aberystwyth & Machynlleth.
Structure: Bridge.
Waypoint: OS0320.

Neighbouring Flush Brackets

G2011	Tre'r-ddôl 1.72km to the southwest.
S0459	Eglwys Fach 2.45km to the northeast.
11001	Fron-gôch 3.26km to the north.
S0460	Tal-y-bont 4.57km to the south.
S0346	Penhelig, Railway Bridge 5.27km to the northwest.

The nearest fundamental bench mark is Machynlleth, 10.96km to the northeast.

Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Aberystwyth to Machynlleth levelling line. The surveyor's description was OSBM Bolt on bridge at NE angle, SE side of road, 27' N from N bank of Afon Ddu.

Logged Visits
Logged on 29th August 2006 by superswifteagle. Grid reference: SN 6680 9389. Condition: Good.
NE end of parapet of bridge over Afon Ddu. Good condition, 2 1/2 inch bolt inscribed with arrow and O S B M. Clearly visible on a drive past if you're in a hurry.