When was the flood diversion bridge built in Lehe Town, Wanning City?

As far as I know, there is no information about the construction of flood diversion bridge in Lehe Town, Wanning City, Hainan Province. You may ask about some bridge engineering information in Lehe Town, Wanning City. Information of some bridge projects in Lehe Town, Wanning City is as follows:

A stone arch bridge named "Lehe Bridge" was built at 1982 in Dutou Village, about 50 meters downstream of Dongmen Ferry in Wanning, to commemorate the glorious history of people in Lehe area protecting the wounded of the People's Liberation Army during the War of Liberation.

I hope the above information is helpful to you!