A trailing edge cooling system for a turbine blade, the trailing edge cooling system comprising: a coolant feed extending radially within the turbine blade, a collection passage extending radially within the turbine blade adjacent the coolant feed; and a cooling circuit (72A, 32A, 32B) in fluid connection with the coolant feed and the collection passage and including: an outward leg (34, 34A, 34B, 36, 44B) configured to extend axially toward a trailing edge of the turbine blade, the outward leg being in direct fluid communication with the coolant feed; a return leg (36, 38, 38A, 38B) positioned adjacent the outward leg (34, 34A, 34B, 36, 44B) and configured to extend axially from the trailing edge of the turbine blade, the return leg being in direct fluid communication with the collection passage; and a plurality of turn legs (36, 36A, 36B) fluidly coupling the outward leg (34, 34A, 34B, 36, 44B) and the return leg (36, 38, 38A, 38B) in the flow direction, the plurality of turn legs (36, 36A, 36B) including: a first turn leg in direct fluid communication with and extending radially from the outward leg; a second turn leg in direct fluid communication with the first turn leg, the second turn leg extending axially from the first turn leg toward the trailing edge of the turbine blade; and a third turn leg extending radially through the turbine blade directly adjacent the trailing edge, the third turn leg in direct fluid communication with the second turn leg and the return leg. a coolant feed extending radially within the turbine blade, a collection passage extending radially within the turbine blade adjacent the coolant feed; and a cooling circuit (72A, 32A, 32B) in fluid connection with the coolant feed and the collection passage and including: an outward leg (34, 34A, 34B, 36, 44B) configured to extend axially toward a trailing edge of the turbine blade, the outward leg being in direct fluid communication with the coolant feed; a return leg (36, 38, 38A, 38B) positioned adjacent the outward leg (34, 34A, 34B, 36, 44B) and configured to extend axially from the trailing edge of the turbine blade, the return leg being in direct fluid communication with the collection passage; and a plurality of turn legs (36, 36A, 36B) fluidly coupling the outward leg (34, 34A, 34B, 36, 44B) and the return leg (36, 38, 38A, 38B) in the flow direction, the plurality of turn legs (36, 36A, 36B) including: a first turn leg in direct fluid communication with and extending radially from the outward leg; a second turn leg in direct fluid communication with the first turn leg, the second turn leg extending axially from the first turn leg toward the trailing edge of the turbine blade; and a third turn leg extending radially through the turbine blade directly adjacent the trailing edge, the third turn leg in direct fluid communication with the second turn leg and the return leg. an outward leg (34, 34A, 34B, 36, 44B) configured to extend axially toward a trailing edge of the turbine blade, the outward leg being in direct fluid communication with the coolant feed; a return leg (36, 38, 38A, 38B) positioned adjacent the outward leg (34, 34A, 34B, 36, 44B) and configured to extend axially from the trailing edge of the turbine blade, the return leg being in direct fluid communication with the collection passage; and a plurality of turn legs (36, 36A, 36B) fluidly coupling the outward leg (34, 34A, 34B, 36, 44B) and the return leg (36, 38, 38A, 38B) in the flow direction, the plurality of turn legs (36, 36A, 36B) including: a first turn leg in direct fluid communication with and extending radially from the outward leg; a second turn leg in direct fluid communication with the first turn leg, the second turn leg extending axially from the first turn leg toward the trailing edge of the turbine blade; and a third turn leg extending radially through the turbine blade directly adjacent the trailing edge, the third turn leg in direct fluid communication with the second turn leg and the return leg. a first turn leg in direct fluid communication with and extending radially from the outward leg; a second turn leg in direct fluid communication with the first turn leg, the second turn leg extending axially from the first turn leg toward the trailing edge of the turbine blade; and a third turn leg extending radially through the turbine blade directly adjacent the trailing edge, the third turn leg in direct fluid communication with the second turn leg and the return leg.