The High Level Bridge Traditional Cache
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A magnetic cache which, from the Newcastle side, takes you across one of my favourite short walks from Newcastle to Gateshead. Beware very bouncy GPS signal around here.
I was originally going to set a puzzle cache with a final location here, but as this is one of my favourite walks from my office in Newcastle, I thought I would make it as accessible as possible. If approaching from the Newcastle side, I hope you enjoy the walk as much as I do. There's a great pub situated on each side of the Bridge which has absolutely no connection with my enjoyment of this walk 
The text of the bridge history found below and some original drawings can be found here: See High Level Bridge Original Drawings
And for a recent point of interest, keep your eye out for the Love Locks
When the High Level Bridge at Newcastle opened in 1849, it was an important part of the railway promoters’ objective to create a continuous line that would run from London to Edinburgh. Designed by Robert Stephenson, the bridge was to combine rail and road traffic, and was the first in the world to do so.
The Newcastle & Berwick Railway secured the Act to build its line in 1845. It stipulated that the company should construct a combined road and rail bridge across the River Tyne between Newcastle and Gateshead, to be completed within four years.
The bridge was designed by Robert Stephenson and detailed drawings were made under the supervision of Thomas E Harrison. To avoid excessive width, and thereby expense, it was decided to carry the railway above, rather than beside, the roadway. The roadway itself was designed to be 20ft (6m) wide with a 61/2ft (2m) footway on either side. The combined width allowed three standard gauge tracks to run across the top rail level of the bridge. The overall length of the bridge was to be 1338ft (408m).
The bridge was a tied arch (or bow-string) bridge with the main structural elements made of either cast or wrought iron. It had in total six spans each 125ft (38m) in length, the cast iron bows supporting the railway while wrought iron ties supported the road deck below. To enable a level line for the railway across the deep and wide Tyne valley, the roadway was built at 96ft (29m) and the railway 120ft (37m) above high water on the river. Contracts for the production of the ironwork were let to local firm Hawkes, Crawshay & Co of Newcastle.
The bridge sits on five masonry piers, 50ft (15m) thick and 16ft (5m) wide. Although the River Tyne at the point the bridge is constructed was no more than 3ft (1m) deep at low water, its bed consisted of some 30ft (9m) of silt before underlying bedrock could be reached. A recent invention, the ‘Nasmyth Steam Pile Driver’, was used for the first time in bridge building, enabling the piles for the bridge foundations to be driven down to the bedrock quickly and efficiently. Rush & Lawton of York were contracted to build the five main masonry piers and the land arches on each side carrying the approaches; 50,000 tons of stone was quarried near Newcastle, mainly at Heddon on the Wall.
To assist in the construction work a wooden viaduct was built immediately to the east of the permanent one. This temporary structure was opened to railway traffic on 29 August 1848, just a year before the High Level Bridge itself was opened by Queen Victoria on 27 September 1849. The public roadway over the bridge was not completed and opened until some six months later.
In 1906 King Edward VII opened the King Edward railway bridge nearby, which provided a shorter route into Newcastle station. Today the High Level Bridge is used as a turning loop on the East Coast Mainline. Between 2001 and 2008 Network Rail undertook an extensive refurbishment project of the bridge which strengthened the structure as well as restoring some if its original features. For its research into the use of cast iron as well as the conservation techniques it employed, the project received prestigious awards, including the 2009 Grand Prize for Conservation from Europa Nostra.
Additional Hints
(Decrypt)
Ernq nyy nobhg vg.
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