Last May, we went to a zoo in Rodriguez (formerly Montalban), Rizal. Using Waze for directions to the zoo, the app took us to a submersible bridge across the wide Marikina River from the main highway (M.H. Del Pilar) to the mainly residential area where the zoo was located. Following are photos of the submersible bridge and the newer more conventional bridge located a little further down the highway.
Submersible bridge connecting Barangay San Rafael with Barangay San Isidro
The “all-weather” bridge as seen from the submersible
There are many bridges like this submersible one across the country. Many were built as weirs or dams that could be used as bridges when the water level allowed it but could let water pass above it during wetter days. Incidentally, there’s one along a popular alternative route between Quezon City and Marikina in Tumana. That bridge can be impassable during times of heavy rains.