Excess phosphorus from a variety of sources has harmed the water quality of Lake Champlain. This decline in water quality threatens agriculture, tourism, and the quality of life for communities around one of North America's most picturesque lakes.

Stone is part of an effort to reduce phosphorus loadings in collaboration with the Vermont Agencies of Transportation and Natural Resources. This story map details how VTrans and Stone are developing plans to reduce phosphorus from VTrans' roads, rights-of-way, and facilities by over 20 percent over the next 20 years.