OSBM Bolt   

OSBM Bolt on SE end of culvert, SW side of road, 8' SE from centre of stream [3GL]; OSBM BOLT CUL SW SIDE RD.

Location
Grid reference: SP 9280 1831.
Landranger 165: Aylesbury & Leighton Buzzard, Thame & Berkhamstead.
Structure: Culvert.
Waypoint: OS0230.

Neighbouring Flush Brackets

823	Ivinghoe Locks 540.37m to the east.
G3273	Ivinghoe Bridge, Brownlow Arms 1.02km to the southeast.
G3272	Horton 1.03km to the northwest.
824	Seabrook Lock Cottage 1.28km to the southeast.
822	Horton - Bridge 121 1.32km to the north.

The nearest fundamental bench mark is Hemel Hempstead, 16.40km to the southeast.

Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Great Linford to Hemel Hempstead levelling line. The surveyor's description was OSBM Bolt on SE end of culvert, SW side of road, 8' SE from centre of stream.

Logged Visits
Logged on 16th February 2008 by dal. Condition: Couldn't find it.
The culvert is still there, but I could see no sign of the Bolt. It has probably gone (I give a cautious Couldn't find, in case I was having an aberration). The culvert on the SW side has a different style to that on the NE side. Even though it doesn't look new, it might have been replaced.