SB 35 passed in 1972 requires that all land in unincorporated areas of the state that are subdivided into parcels less than 35 acres in size, shall be evaluated, by the developer, for among other things, adequate water supply, sewage treatment and "geolgic characteristics of the area significantly affecting the land use and determining the impact of such characteristics on the proposed land use. The Colorado Geological Survey is required to "evaluate the geologic factors which would have a significant impact on the proposed land use." In two years, the state survey has reviewed 1,298 geologic reports ranging from less than one acre to several thousand acres. In approximately 50% of the cases, our recommendations were for approval, 25% were conditional, and in 25% we recommended disapproval. In 1974, HB 1041 was enacted and required the Colorado Geological Survey to prepare Guidelines and Criteria for Identification and Land Use Controls of Geologic Hazard and Mineral Resource Areas and to prepare Model Requlations for Administration of the geologic hazards enumerated in these guidelines. These hazards include avalanches, landslides, rockfall, mudflows and debris fans, unstable slopes, seismic effects, radioactivity, ground subsidence and expansive soil. These guidelines and regulations are intended for use by all county and municipal planning and zoning boards to aid in identifying and designating geologic hazard areas and regulating land use within designated areas. All maps of designated geologic hazard areas are to be filed with the Colorado Geological Survey and this agency is to provide advice and counsel concerning land use changes where geologic hazards have been designated.

  • Supplemental Notes:
    • The Symposium held on April 2-4 1975 at Moscow, Idaho, was jointly sponsored by Idaho Transportation Department University of Idaho, Moscow; Idaho State University Pocatello; and Boise State University.
  • Corporate Authors:

    Idaho Department of Highways

    P.O Box 7129
    Boise, ID  United States  83707
  • Authors:
    • Ladwig, L R
  • Publication Date: 1975-4

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00127659
  • Record Type: Publication
  • Created Date: Mar 10 1976 12:00AM