scdiggin, "rivers" can be going through a multitude of different types of entities. I mean, there's no one category of "river" for whether or not "metal detecting is ok". Because a river can either be on federal, state, county, city, or private. And even within state and federal (for instance) there are .... even there .... multiple types of state or federal land it could be. Like in other words, not all federal land is federal PARK land. And not all state land is state PARK land. So for example, just because a certain state might have dire sounding wording in their state park's codes, does not mean that "all state land is off-limits". Since, of course, what you're reading only applies to state PARKs, and not other types of state land. For example: road right-of-way is an example of state land, that is not "park" land, and so forth. But let's cut to the chase here: you say you've got a few "awesome spots". Is that to assume you've been out to them, and seen and looked at them? Then if so, I would assume that the mere fact of being there (standing their looking at them) was not unusual, or illegal, etc.... In other words, the mere fact of being there was not an issue, right? Well then, assuming you're not in some sort of obvious historic monument, then why would you think that metal detecting is somehow inherently evil, that you can't do it? If it were me, and barring something obvious as a glaring monument park sacred place, I'd just do it. But if you're really skittish, you're welcome to study the assessor's and topo maps (which have color codes) to see who owns what. But it's going to get complicated, because depending on how close to the water's edge you're talking about, minute boundries get very exacting. For example: "navigable rivers" (those that can handle boats of a certain size, for shipping or whatever) are accessible. However, I suppose that would only be up to the high water mark (ie.: as long as you're on the shores). But personally, if you're just talking random rivers not on some sort of sensitive monument, and places where you or anyone can already just walk, go, fly frisbees, etc.... then .... I'd do it.