At approximately 0740 mountain time, a Cirrus Design SR20 crashed near Fish Haven. The pilot was seriously injured. The pilot said he made a low pass over a private airstrip at about 50 to 70 feet agl. The said that during the pass the airspeed got too low. He applied full power and intended to retract the flaps from full to half, but in actuality retracted them completely. The aircraft lost altitude and collided with the ground.