Investigating snow layers at Sam Charley Slough Photo Credits: Chas Jones The group gathers at a site on land at Sam Charley Slough as Matthew Sturm, snow scientist for the U.S. Army of Corps of Engineers, cuts into the layers of snow to investigate their properties. Process Observed: Snow InsulationSnow Depth Date Process Observed: Monday, March 8, 2010 Galleries: Sam Charley Slough A Gallery