Occurrence, quality, and availability of ground water differ considerably from place to place in the Eola-Amity Hills area because of the highly diversified geologic and hydrologic conditions. A table relates the geologic situation to the availability of ground water for four areas--Eola-Amity Hills, east and west valley plains, and Willamette River flood plain. Tables show well and spring records, drillers' logs, and chemical analyses of ground water. The final interpretive report will be published by the U.S. Geological Survey.