One of the little snags with this website as a whole is that sometimes people (often FEs) throw out some supposed demonstration of Flatness that requires some experience or expertise with an uncommon science like aviation or architecture. This is one such example. We are presented with a suppositious ten mile bridge. But I had thought that the seven mile bridge to Key West, Fla., was the longest bridge (at least in North America), and having ridden on that bridge more than once I can attest that it's not exactly level end to end. So as far as I know, there is no perfectly level ten mile bridge.
Notwithstanding, I would assume (in my amateurish way) that a bridge connects two points of land - points that both stand higher than the water between them. So if the bridge between them were somehow perfectly straight and level, although the middle of the bridge might seem a bit closer to the water's surface than either end of the bridge is, it would still be possible. At what point would the (presumed) curvature of the earth cause the water midway between the two ends of the bridge to wash over the surface of the bridge? It probably depends a great deal on the relative height of the points of land and the distance between them, and a professional bridge builder could probably answer that question with little difficulty; I would simply think that, judging from most steel suspension bridges I have seen (like the ones in NYC), the distance would be many miles more than ten. Now, if you were a full 150 feet above sea level then the horizon would be just 15 miles away, so assuming your bridge is a good deal less than 150 feet above the water (sea level), say about 40 feet above the water, then ten miles would exceed the distance to the horizon (7.7 miles) - a perfectly straight roadway or bridgeway 10 miles long would stick out into the air like an enormous diving board. So the example given is very doubtful. The water surface of the planet follows its curvature, notwithstanding that in small quantities it appears to be perfectly level and straight, and a long bridge must, if it hopes to touch land at both ends, also follow the curvature.