Well, that's Oklahoma Smokin Cache and lucky you, it finally got hot so you probably didn't have to put up with chiggers at least. I don't know about Lake Murray, since it's older, but every state park in Oklahoma had an archaeological survey done prior to construction. These surveys were published and list every historic and pre-historic site found or known to be within the proposed park boundaries, and list their legal location. Maybe not every park, but particularly the ones associated with BLM lands did. These list old home places, Indian camp sites or areas of activity, and other areas of historical note. I'm not sure how you can come across one (maybe call the Oklahoma Archaeological Survey? Ask for Richard Drass.) I have one for a few parks in western and southwestern Oklahoma. I used mine in attempting to nail down a purported location of a lesser known 7th Cavalry camp from 1868 along the Wash*ta River in Oklahoma. Due to 9/11, and the location, I could only stand a 1/2 mile away and look thru cheap binoculars. I was confronted real quick by overzealous law enforcement and ordered to leave the area. I pointed out I hadn't crossed nor displayed any intention to cross their damn fence, and was an American citizen, but they had bigger guns so I left. Good huntin, and plan a trip to Oklahoma in October or so. You might like it better, but they could have freezing rain.