Since its initial construction in 1860, Alcatraz Island has been a “star attraction” located in the San Francisco Bay area. This major historical site and tourist destination makes the effects of ongoing geologic hazards and erosion on cultural features and public safety a long-term concern.
This study provided the National Parks Service with the first ever Geologic Risk Assessment Zonation map that easily identifies problem areas and provides recommendations, on a relative-rated risk basis, for areas needing immediate study and mitigation as well as for future, phased mitigation studies. The study also summarized the
impacts on the island and improvements resulting from future sea level rise.