When the government came in and bought up the failing farms during the Depression, little consideration was given to historic preservation. Most all of the homesteads were simply razed since the soil was depleted and they could no longer be farmed. The archaeologists are now going back to the known sites to try to recover whatever relics remain.
It's unlikely that there were ever native American settlements along the ridge because it was never ideal for farming and lacked water, but it would have been prime land for hunting so certainly arrowheads would remain, but good luck finding them.
I'm reminded way too often these days about how short life truly is.