There is an evacuation for the area downstream from Leyden Dam. There is not a fear of the dam failing, rather excess runoff from the spillway. The borders are 82nd to 66th and Alkire to McIntyre. If you are in this perimeter near a creek, ditch or low lying area you are encouraged to evacuate. Ralston High School is no longer the Jefferson County evacuation site. A new shelter is being set up at Arvada High School, 7951 West 65th Avenue.