Roads play an important role in lake health (Davis et al. 1978).  Their impervious nature can directly affect runoff qualities and quantities, by channeling water toward or away from the lake.  This allows a small land use area to contribute disproportionately to phosphorus loading in a water system.
	The total area for the 2003 map was calculated by measuring the roads during a road survey (see Watershed Development: Road Survey).  While this survey was conducted in 2005, it was assumed that the roads and their respective areas did not change significantly over those two years. Road data could not be obtained from the 1965 aerial photographs.
	Depending on the quality of the roads, 1.1% of watershed land cover may contribute a significant amount of pollution into nearby groundwater