I am not a big fan of locator calls in the morning on public land. The sooner they gobble, the sooner more guys try to get on the same bird. An owl or a coyote howl about an hour AFTER dark seems to work pretty good, esp the first couple of days. They wise up pretty quick as every fella(or kid) that heads out after work or school tends to blow an owl hooter every five minutes from 3pm till they leave. As for the dam, it is pretty much one way in-one way out and things will crowd up pretty quick(But there ARE birds there). Briar Ridge is too easy of a walk to discourage anybody. Look for those out- of- the way areas where you have to work to get to and get there early.