Abstract

Ground water in Park Valley is produced from both the Quaternary alluvium and from the Salt Lake Formation, and locally also from Paleozoic rocks. Well logs indicate that the unconsolidated Quaternary alluvium is generally less than 100 ft thick. The productivity of wells drawing from the Quaternary ranges up to 500 gpm. Production from the Salt Lake Formation is associated with sandstone units and beds described as “loose gravel,” but such units are not productive everywhere in the valley. The variation in productivity is not completely understood. Wells producing from the Salt Lake Formation range in productivity up to 300 gpm. The most productive wells, capable of pumping up to 1,350 gpm, draw from both Tertiary and Quaternary deposits. Near the Black Hills, west of Rosette, Utah, some small wells draw from fractured Paleozoic rock and from the overlying Salt Lake Formation. Results of deep tests of Paleozoic rock near Park Valley community and in Muddy Creek, conducted by the Bureau of Reclamation in 1972, were disappointing.