I don't know, SS. But a quick search turned up a link to nutria hunting at and near Broken Bow lake in far Southeastern OK, which makes a lot of sense, being a wet area - the farther south and/or east you go, and the more water, the more nutria. But I also found a link to nutria being near Kaw Lake with is in far north central OK as well, so I'd say keep googling, and if you want to see okla. state public hunting lands (WMAs), go look here:
http://www.wildlifedepartment.com/wmas2.htm
http://maps.scigis.com/odwc/MapFrame.asp
look for marshes/wetlands.
http://www.lakesandreservoirs.com/Ok...=OK06lk002a002
http://www.lakesandreservoirs.com/Ok...kenBowLake.php