4000 years old.
Triangels are the strongest shape so make a triple triangle design i aced it that way +++ The plank bridge is the weakest as it is just a simple beam with no central support or stiffening for the span. The other two can be designed to comparable strength for a given span, but work in somewhat different ways: the truss bridge acts as a beam stiffened by the truss frames, the arch transmits the forces from the centre to its abutments.
The old (1830) London Bridge is now in Lake Havasu City, Arizona.
The current London Bridge - the one in London - dates from 1973. Its predecessor which is now in Lake Havalu Arizona, was originally built in 1820.
The Old Naini Bridge is one of the longest and oldest bridges in India, located in Allahabad. It is a double-decked steel truss bridge which runs across the Yamuna river in the southern part of the city.The bridge runs North-South across the Yamuna river connecting the city of Allahabad to its neighborhood of Naini.
COnstructability
The old London Bridge, which spanned the River Thames from 1820 until 1970, was dismantled and re-erected at Lake Havasu in Arizona as a tourist attraction. There is an urban legend that the buyer thought that he was buying Tower Bridge, which is much more spectacular.
The present London Bridge, in London, is a pre-stressed box girder bridge. Tower Bridge is often mistakenly referred to as London Bridge. The old London Bridge was dismantled and shipped to Lake Havasu, Arizona and is the second biggest tourist attraction in the state. The photograph displayed here is of Tower Bridge.
The address of the Old Bridge Public Library is: 1 Old Bridge Plaza, Old Bridge, 08857 2474
The 1831 John Rennie designed bridge was bought and shipped to Arizona it replaced an older bridge (600 years old). The current London Bridge which dates from 1973 is still located in London at the same site where a bridge has stood for 2,000 years.
To figer that out, well it is hard. you would have be a geart geomiter or bulider. some steel bridges are pritty old so yeh.
The Grand Canyon, London Bridge, Hoover Dam, the Mojave, Sonoran and Painted Deserts, Meteor Crater and old Tombstone.