2013 Grand National to modifications made for the previous year's race, Aintree announced that a number of further changes had been made for the 2013 National. Twelve of the 16 fences on the course were rebuilt with the timber frames within them replaced by a softer material known as "plastic birch". The fences are still covered with at least 14 inches of spruce and will remain the same height. The starting line was also moved 90 yards closer to the first fence, further away from the spectators' stands and thereby reducing slightly the overall distance. Aintree and the Professional Jockeys' Association jointly issued
Grand National to knock off. Some of the jumps carry names from the history of the race. All 16 are jumped on the first lap, but on the final lap the runners bear to the right onto the run-in for home, avoiding The Chair and the Water Jump. The following is a summary of all 16 fences on the course: Height: Often met at great speed, which can lead to several falls, the highest being 12 runners in 1951. The drop on the landing side was reduced after the 2011 Grand National. Height: Prior to 1888 the first two fences were located