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We include active folds in this database as well as other folds that have evidence for movement within the Quaternary time period (last 2.58 million years) or suspected movement in the Quaternary, because associated faults all have the potential to create a damaging earthquake sometime in the future within a time frame that matters to humans. Throughout scientific history in Washington state, different interpretations of Quaternary faults and folds have resulted from different mapping methods and scales of investigation. Dataset users will benefit from a full investigation of sources cited, other past work, and developing an understanding of the breadth of study types for any particular fold of interest. For earthquake hazards characterization, this database is best used in reconnaisance-scale investigations, to identify regions closer or further away from active faults in a qualitative sense, or in probabilistic seismic hazard analysis studies (PSHA) that consider the hazards that faults pose for a given area in a probabilistic sense. 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