To establish a more comprehensive base of empirical evidence on interactions between highways and wetlands, case studies were conducted at eight highway sites in wetlands at various U.S. locations. Selection of the study sites was based in part on a comprehensive review of literature on highway-wetland interactions. The conclusions drawn from the case studies also reflect information obtained from the literature review. Since all case studies involved analyses of wetlands in which highway-induced changes had already taken place, the effects that were observed or deduced were largely limited to major, long-standing changes resulting from the continuing physical presence of a highway facility. Four classes of effects appear to dominate: (a) altered drainage, the most common effect; (b) interrupted tidal exchange, a manifestation of altered drainage found in tidal areas; (c) physical obliteration of wetlands resulting from the placement of highway fill or disposal of dredged material; and (d) habitat creation, included not because of its general occurrence but as an example of what can be done in many instances. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; Maps; References;
  • Pagination: p. 29-37
  • Monograph Title: Aerial surveys, geometrics, surface drainage, ecological impacts and safety appurtenances
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00316653
  • Record Type: Publication
  • ISBN: 0309029910
  • Files: TRIS, TRB
  • Created Date: Oct 27 1980 12:00AM