DURING A NIGHT TOUCH AND GO LANDING, THE AIRCRAFT VEERED LEFT AND STRUCK A SNOWBERM AS THE PILOT WAS ADDING POWER TO TAKEOFF. SNOWBERMS WERE LOCATED INSIDE OF THE RUNWAY LIGHTS MAKING THE USABLE RUNWAY LESS THAN 75 FT AND POSSIBLY RESTRICTING THE LIGHTING. THE PILOT REPORTED THAT THE AIRCRAFT SUDDENLY VEERED AS THE THROTTLES WERE SLOWLY MOVED THROUGH ABOUT 1/2 OF THEIR TRAVEL. HE SAID THAT THE PLANE HIT THE SNOWBANK BEFORE HE COULD EXERT ENOUGH RIGHT RUDDER AND DIFFERENTIAL POWER TO HOLD IT ON THE RUNWAY. THE LEFT GEAR WAS SHEARED OFF AND CAME TO REST NEAR THE RUNWAY CENTERLINE. THE NOSE AND RIGHT GEAR COLLAPSED AS THE AIRCRAFT WENT OFF OF THE RUNWAY. THE PILOT STATED HE THOUGHT THE WING TIP CAUGHT THE SNOWBERM AND/OR THE LEFT MAIN GEAR COLLAPSED PRIOR TO CONTACTING THE SNOWBERM. NO IMPACT DAMAGE TO THE LEFT WING WAS REPORTED.