Let's add in many other wet sauropod track sites, including the famous and excellently detailed sauropod trackways near Glen Rose, Texas, which are in a carbonate (hence marine-derived) substrate, as are others from Texas and Arkansas. Add also the ones I have found here in two different counties here in Maryland, which occur in several different types of substrate, but all of which indicate wetlands types of paleoenvironment, ranging from seemingly deltaic fan type situations, to outright swamps, and maybe flood plains.
[clipped] Off the top of my head I can recall no sauropod tracks or trackways from other than rather wet environs. Of course, there may be a preservational bias in all this, but I doubt for several reasons that sauropods would survive very long in areas without plenty of water.