Of all methods of bridge building, the stone arch bridge is truly the most timeless and enduring. With all the advances in technology, it is remarkable to note that nothing has ever been built that will match the long-term durability of the stone bridge.
Natural Materials
A good stone bridge has at its heart good stone. Good stone, such as granite, is hard, and resists the elements. Stone is a natural material, the very material that composes the earth itself. As such, is it any wonder that high quality natural stone can outperform any synthetic material man can make?
Gravity
The stone bridge uses gravity to span a gap. Unlike any other bridge type which by design fights against gravity, the stone arch bridge uses a simple curve which works with gravity to bridge an opening. This curve transfers weight smoothly down to a solid foundation. This remarkable characteristic of the arch is probably the biggest factor in the arch’s durability. Whereas gravity is constantly working to take down other types of bridges, gravity works in the arch to press it tighter together, making it stronger. Would not this fact explain why the arch cannot be equaled for durability?
Historical Proof
History testifies to the durability of stone bridges. Roman bridges are a classic example. Many Roman bridges remain all these millennia later, loudly proclaiming the longevity of the stone arch bridge. How many modern bridges can survive a couple hundred of years, let alone a couple millennia?
A Timeless Shape
Another aspect of the stone bridge is appearance. The fact is, the natural curve of the bridge, the use of natural stone, the blending of a stone arch bridge with its landscape is another huge factor into the appeal of this type of design. And, honestly, which compliments the landscape better, being more scenic: the stereotypical modern bridge, or the stone arch bridge?
Stone Arch Bridges 