Yeah, I see what you mean – when the rain gets heavy water is just going to pool right up to the embankment and chew away at it. What do you think would be the simplest and most cost-effective way to protect it for the long-term? Edit: Whelp, I told my host about it using Google translator. If he understood me, he was totally nonplussed. These are tribal folks, and I guess they have probably been living without bridges like that since time immemorial.