Preliminary Geologic Map of Bainbridge Island, Washington

Winslow, the commercial center of the island, is a 35-minute ferry ride from Seattle. The island lies within the Suquamish and Bremerton East 7.5-minute quadrangles.

This open-file report is an advance view of quadrangle-format mapping of these areas by the U.S. Geological Survey. This study of Bainbridge Island was undertaken in response to (1) recent awareness of the hazard posed by future earthquakes in the Seattle fault zone, at the south edge of the island, and the need to marshal geologic evidence for the rate and style of deformation; (2) increasing population on Bainbridge Island and consequent pressure on groundwater resources; (3) concern about landslide hazards; and (4) increased awareness of the role that the nearshore zone plays in supporting marine resources.