This 1890 bridge over Minnehaha Creek once carried both Minnehaha Avenue and a street car line. Today, the street car line has been replaced with a wide lawn, and a regional rail runs along the other side of the street. This bridge is unusual in several respects. First, it is very wide, 75 feet from edge to edge. Second, the two sides of the bridge look vastly different. The downstream side looks like old Minnesota sandstone, while the upstream side is concrete. The railings are also totally different side to side. Since the stone is inside the arch, I doubt that it was put there just for looks. I suspect that the answer is that this bridge was widened, perhaps when it was rebuilt in 1925, with concrete being used for the addition. It would be interesting to learn the story behind the two faces of this structure.
This bridge is listed in the National Bridge Inventory as being “basically intolerable requiring high priority of replacement.” I don't see the issue with this bridge. It looks to be intact, it isn't crumbling, and the foundations are listed as being stable. It sees relatively low traffic, most of which is very slow moving park traffic. It is a fantastic looking historic structure that would be shame to lose.
The photo above is the downstream east face of the Minnehaha Avenue bridge over the Minnehaha Creek. The photo below is the upstream west face of the bridge as seen from the Milwaukee Road Railroad Bridge. Note that the two faces of the bridge look totally different.