At 0735 Mountain time, the airplane was substantially damaged when it impacted terrain during a forced landing following a partial loss of power. Visual conditions prevailed; the Private pilot and pilot-rated passenger were uninjured. The pilot subsequently reported experiencing a partial power loss shortly after takeoff and was unable to maintain altitude. He performed a forced landing on a highway median approximately one mile south of the airport. Examination revealed that the landing gear were separated, the firewall was buckled and the propeller blades were bent.