How can I tell what is private land and what is public?

Please check out the interactive map center on the IDFG website for a detailed map.  After you open the map center, zoom to the area you are interested in.  On the upper left hand side, select turn layers on/off. Scroll down throught the selections and turn on land management status.  This will display property ownership in different colors. This reservoir's shoreline is about 99% private and 1% public (BLM).  Technically, you could legally access the 1% that is public if you had a good GPS unit and a map and if the reservoir was near full pool. However, I would not recommend that anyone try this as the margin for error is small and the fishing is not likely worth it due to recent drought conditions.