The small stream bridge lay five major Western halls of Western village of fort township, established in the second year of perpetual calendar in Ming Dynasty (1574) . Rebuild to the 59th year of Qianlong clear ' 1794 years).

Because the former address is in the low reaches " The reservoir of Lanxi bridge " Stored it in water district, relocated herein according to the original appearance in 1984. Announced for the fourth batch of provincial historic reservation units in Zhejiang in 1997. Although go through the trials and hardship for more than 200 years, still intact, it is the embodiment initially of the extant like bridge of the whole province, study value. It is a historic reservation unit at county level.

Lanxi bridge whether one large the intersection of span and wood join, stretch the intersection of arm and the intersection of corridor and the intersection of room and wooden arch bridge, like rainbow of flying to still, link the Western hall together with the highway ingeniously. The bridge is 48.12 meters long, 5 meters wide, 9.4 meters high to the riverbed, joined a appearance and took the form of the Eight Character, was connected and made up in vertical-horizontal the fourth of the twelve Earth Branches by several dozen sticks of thick log inside, have, resist, press, resist curved resisting the intersection of side and the intersection of person who move and function.

Set up three layers of breastplates on both sides two times, pile hangs down and likes the bridge skirt sequentially, simple and unsophisticated and refined, the framework principle of its bridge of body can be rated as a big masterpiece in the history of folk bridge building of China.