A turbine rotor blade with a cooling circuit that provides for multiple metering and impingement cooling for the entire airfoil. A cooling supply channel delivers cooling air into a leading edge impingement cavity, a row of suction side wall impingement cavities, and a row of pressure side impingement cavities through metering holes to produce impingement cooling for each cavity. Another series of impingement cavities is formed in the trailing edge region and connects with the last impingement cavity in the mid-chord region to cool the trailing edge.