KAMI-SHIHORO, Hokkaido--It is known as the "phantom bridge" because the arched concrete span over Hokkaido's Lake Nukabirako vanishes from sight when water levels are adjusted by a dam on the ...

The arch and columns are weathering steel while the main deck and legs is reinforced post-tensioned concrete. Photographs of the bridge under construction are given in Figures 1 and 2, as well as in ...