Engineering geology covers a broad spectrum of geological investigations made to support civil engineering and construction projects. GEO-HAZ consults on both existing facilities and new ones. Where new site selection is influenced by geologic factors, we can provide GIS-based site suitability comparisons among multiple candidate sites (for fixed facilities) or alignments (for roads, pipelines, utility corridors).


GEOHAZ performs geologic mapping of dam sites and spillway/outlet works at scales of 1 inch=10 ft and smaller, to document all the rock types and discontinuities that can affect later dam performance and safety. Such mapping is also integrated with geologic maps of reservoir region to identify geologic hazards that may affect reservoir operation (active faults, landslides).
Here are some of the dams we have worked on: (Click for larger images)

engineering-geology Cooper-Lake-Dam-AKAlaska: Cooper Lake Dam

engineering-geology Folsom-Dam-CACalifornia: Folsom Dam




 engineering-geology Peterson-Dam-COColorado: Peterson Dam

 engineering-geology Mountain-Home-Dam-COColorado: Mountain Home Dam

 engineering-geology Joes-Valley-Dam-UTUtah: Joes Valley Dam

 engineering-geology Mountain-Dell-Dam-UTUtah: Mountain Dell Dam



engineering-geology Twin-Lakes-Dam-UTUtah: Twin Lakes Dam

 engineering-geology UT-First-DamUtah: First Dam




engineering-geology San-Pedro-Dam-CHILEChile: San Pedro Dam


GEO-HAZ has performed geologic mapping and hazard analyses for new road alignments and existing highways. Slope stability of natural and cut slopes and rockfall hazards are assessed via mapping, drilling, trenching, geophysics, and modeling (static and dynamic).
landslide-hazards Snodgrass-drilling-triple


Critical facilities often have siting requirements and operational safety requirements that greatly exceed those for residential and commercial construction. Broadly requirements are to avoid and/or mitigate geological conditions and hazards. GEO-HAZ specializes in this field, and can often recommend modifications to siting, orientation, or design that reduce hazards while saving the project money.

SINCE 1984

Since 1984 GEO-HAZ personnel have interfaced with the Association of Environmental & Engineering Geologists (AEG) to keep abreast of the latest trends in engineering geology. In many cases GEO-HAZ scientists have defined the state-or-the-art, as indicated by our Principal receiving the AEG's Holdredge Award in 1999, the Geological Society of America's Burwell Award in 2000, and the AEG/GSA Jahns Disinguished Lectureship in 2013.