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The principal activity in this study was an examination of the potential aggregate availability of the Adjacent 48 States within an extant physiographic classification system. The classification selected was a modified version of the Woods-Lovell Physiographic-Engineering System, comprised of 97 physiographic sections. Estimated potential aggregate availability was rated at four levels, ranging from "abundant-to-adequate" to "severe-problem." Individual physiographic section ratings were assigned following an examination of the major aggregate type(s) used, their distribution within the section, and any quality limitations associated with their use. Information relative to aggregate types and characteristics was gathered from: the literature, particularly bedrock and surficial maps, and responses to a materials questionnaire sent to each state highway agency. The study shows that aggregates are potentially in short supply over about one-third of the Adjacent 48 States, i.e., these areas have "limited to severe problem" ratings. Such areas are primarily comprised of regional topography formed from predominantly sandstone and shale bedrock, or from transported deposits deficient in either quantity or quality of sand-gravel and underlain by bedrock with little or no aggregate potential.

A Generalized Investigation of Potential Aggregate Availability by Regional Geomorphic Units within the Adjacent 48 States