Timber Stand Improvement is a tool which is used to make an overgrown forest more healthy. This is done by thinning out smaller trees to make the remaining trees grow larger and more healthy. Some Ponderosa pine trees have a blight and the removal of trees makes the trees more able to withstand the disease. It produces the effects that a fire would, without having to burn the forest. The wildlife will be enhanced, and the water quality in the area may increase.