<P> The Namdang Stone Bridge ( Assamese : নামদাং শিলৰ সাকো ) is historic bridge located a few kilometers away from Sibsagar town in Assam , India . It was constructed in 1703 by craftmen brought from Bengal during the reign of Ahom king Rudra Singha . The bridge is 60 m ( 200 ft ) long , 6.5 m ( 21 ft ) wide and 1.7 m ( 5.6 ft ) high . It runs over the Namdang river , a tributary of the Dikhou river . The present National Highway 37 is passing over it . The unique characteristic of the bridge is that it was cut out from a single solid piece of rock hundred years of age . </P>
who built the stone bridge over the river namdang
craftmen brought from Bengal during the reign of Ahom king Rudra Singha