An area of potential heaving bedrock associated with expansive, steeply dipping bedrock in Jefferson County. The Designated Dipping Bedrock Area (DDBA) (PDF) defines an area of Jefferson County where heaving bedrock is possible under certain geological and human-influenced conditions. Please also see the Dipping Bedrock Section of the Zoning Resolution for more information.
Ground subsidence is the sinking of the land over man-made or natural underground voids. In Jefferson County, the most common type of subsidence is the settling of the ground over abandoned mine workings. Please see the Comprehensive Master Plan for your area for mapped areas of subsidence, as well as the Jeffco Interactive Mapping Application . This layer is located under the “Geologic Hazards” layer in the interactive map.