U.S. Fish and Wildlife Service

Division of Refuge Planning
Mountain-Prairie Region

Hydrogeomorphic analysis

Hydrogeomorphic methodology (HGM) analyzes historical and current information:

  • geology and geomorphology (the study of landforms and the processes that created them)
  • soils
  • topography and elevation
  • hydrologic (water cycle) condition and flood frequency
  • aerial photographs and maps
  • land cover and vegetation communities
  • key plant and animal species
  • physical human-caused features of an ecosystem

HGM provides a context to understand an area's physical and biological formation, features, and ecological processes. This historical assessment becomes the baseline condition to determine what changes have occurred in an ecosystem. HGM helps define the capability of an area to provide key ecosystem functions and values and identifies options to restore and sustain ecological processes and resources.

Alamosa National Wildlife Refuge, Colorado

Benton Lake National Wildlife Refuge, Montana

Cokeville National Wildlife Refuge, Wyoming

Lee Metcalf National Wildlife Refuge, Montana

Monte Vista National Wildlife Refuge, Colorado

Ouray National Wildlife Refuge, Utah

Quivira National Wildlife Refuge, Kansas

Seedskadee National Wildlife Refuge, Wyoming