Fig. 1. Shaded-relief topographic map of the eastern Snake River Plain and adjacent mountain ranges of the northern Basin and Range province and the Northern Rocky Mountains.
Fig. 2. The drainage basin of the Snake River Plain Aquifer has continuously grown to its present size by surface subsidence of the eastern Snake River Plain for the past 4 million years.
Fig. 4. Regional map of the eastern Snake River Plain showing volcanic rift zones, Holocene lava fields, and major faults in the adjacent Basin and Range province (modified from Kuntz et al., 1992).