国界橋は 新潟県糸魚川市、長野県北安曇郡小谷村の蒲原沢に架かる橋。 旧国界橋は1936年完成。全長48.2m、最大支間長31mのトラス橋。1994年、新国界橋の完成に伴い国道から新潟県道375号へ降格となるが、1995年、7.11水害の土石流災害により新橋が流されたため、修復を行いながら国道の迂回路となる。1998年に新々国界橋が完成し、再び旧道化。 糸魚川市に渡った先が7.11水害とは別の土砂災害により通行止めとなり、付近で廃信号機、廃道路標識が見られる。
Kunibashi bridge is a Itoigawa city in Niigata Prefecture, a bridge over Kanbarazawa in Otari village in Nagano Prefecture. The former National Bridge was completed in 1936. A truss bridge with a total length of 48.2 m and a maximum span length of 31 m. In 1994, as the New National Bridge was completed, it was demoted from National Highway to Niigata Prefectural Highway No. 375, but in 1995, 7.11 the Shimbashi was washed away due to a flood disaster caused by flood damage, so it will be a detour route for the national road while repairing. In 1998 a new bridge of national borders was completed, and it became an old road again. The place which crossed Itoigawa-shi was closed due to sediment-related disasters other than flood damage 7.11, waste traffic lights, abolished road signs are seen in the vicinity.