This report describes the early development of the Oregon Traffic Safety Data Archive (OrTSDA) with its mission to Òbuild the knowledge base of traffic safety data in OregonÓ. The archive aims to provide current and historical sets of related data with an online interface, and encompass complete documentation. OrTSDA contains statewide reported motor vehicle crashes, population data, estimated vehicle miles traveled, traffic crime, and data on driving under the influence measures, which are available online for query and analysis. The archive produces safety performance metrics for statewide, county and city aggregations. Pre-built queries can filter for crash type, month, time, and severity. Raw crash data is available for experienced users. A map-based tool allows selection of crash data within a drawn boundary. This report includes a review of other online highway safety data portals, noting that interactive crash portals are restricted to a few state agencies or research university partners.