A utility pole is reinforced by assembling and installing a reinforcement channel assembly comprising a lower reinforcement channel driven into the ground alongside the pole, an inner splice plate supported on and against an inner surface of the lower reinforcement channel, an upper reinforcement channel supported on and against an outer surface of the inner splice plate, and an outer splice plate supported on and against respective outer surfaces of upper and lower portions of the upper and lower reinforcement channels. An outer splice plate is secured to the inner splice plate, sandwiching between them the respective upper and lower portions of the lower and upper reinforcement channels, and the upper reinforcement channel is secured to the pole.