INTRODUCTORY OBSERVATIONS.
3
Alpine roads, protects the road line from the debris that rollsdown from the lofty and almost overhanging precipices above it.
The Ogwen River and valley are then crossed by a stoneviaduct 246 yards in length; and between this and the Bri-tannia Bridge the line passes through three ridges of hillsperforated by tunnels, 440, 920, and 726 yards in length,through slate, greenstone, and primary sandstone; the RiverCegyn, with its beautiful valley, being crossed by a viaduct132 yards long and 57 feet high. The line thence continuesrising to the level of the Britannia Bridge, and enteringAnglesey, passes across the Maldraeth Marsh, and througha tunnel, in slate, rock, and clay, 550 yards in length. Toenter the Island of Holyhead use is made, to a certain extent,of the embankment of the Holyhead Road Commissioners,called “The Stanley Sands Embankment,” for w’hich theCompany are required, as at Conway, to make a yearly pay-ment to Her Majesty’s Commissioners of Woods and Forests.The amount in this case is 106/.*
It is the object of the present volume to describe twoof the most important works in this magnificent catalogue—the passage of the Conway River and of the Menai Straits.
* The magnificent harbour of refuge, now in course of construction byHer Majesty’s Government, under James Rendel, Esq., and towards whichthe Company contributes a sum of 200,000 1 ., will ultimately form the ter-minus. The total area of this harbour at low water will be 316 acres, pro-tected by a pier and breakwater 2500 yards long, and about 115 feet wide.The distance of the various stations from Chester is as follows:—
Queensferry, Flintshire 7
Miles.
Conway, Carnarvonshire 45}
Miles.
Flint
- 12J
99
Aber —
54}
99
Bagilt
- 14}
99
Bangor —
59}
99
Holywell
— 16*
99
Llanfair, Isle of Anglesey 63}
99
Mostyn
— 20
99
Gaerwen —
66}
99
Prestatyn
— 26}
99
Bodorgan —
72}
99
Rhyl
— 30
99
Ty Croes —
75}
99
Abergele, Denbighshire 34}
99
Valley —
81
99
Colwyn
— 40}
99
Holyhead Island
CO
99