THE PILOT PLANNED TO EXAMINE CATTLE WHICH WERE LOCATED IN THE AREA AND TO MEET WITH ASSOCIATES. THE PILOT REPORTED THAT WHEN HE EXAMINED THE ROAD ON WHICH HE PLANNED TO LAND FROM THE AIR IT APPEARED TO BE SATISFACTORY. THE PILOT LANDED ON THE ROAD, DRIFTED LEFT, ENTERED THE SOFT DIRT SHOULDER, AND COLLIDED WITH A ROCK.