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The U.S. Geological Survey began a regional aquifer-system analysis of the Northern Rocky Mountains of northern and central Idaho and western Montana in 1990. The analysis helped establish a regional framework of information for aquifers in about 70 intermontane basins in an area of 80,000 square miles. In many areas, ground water is the only suitable source of supply, yet little information is available about this resource. Selected geohydrologic data from 1,004 wells in 19 intermontane basins in Idaho were compiled as part of the regional analysis. Data consist of basin name and well number, altitude of land surface, date of well construction, geologic unit, depth of well, diameter of casing, type of finish, top of open interval, primary use of water, date of water level measurement, water level, discharge, specific capacity, source of discharge data, type of log available, date of waterquality constituent measurement, specific conductance, pH, and temperature. A similar report for intermontane basins in Montana has been published by the U.S. Geological Survey in Montana. INTRODUCTION In 1990, the U.S. Geological Survey (USGS) began an investigation of the ground-water resources of the Northern Rocky Mountains intermontane basins in northern and central Idaho and western Montana as part of the Survey's Regional Aquifer-System Analysis (RASA) program. This investigation concentrated on alluvial basins and included determination of the aquifer boundaries, quantity and quality of the water within the aquifers, and recharge characteristics of the aquifer systems. The investigation helped establish a regional framework of information for aquifer: in about 70 intermontane basins in an area of 80,000 mi2 . As part of this investigation, selected geohydrologic and water-quality data from 1,004 wells in 19 intermontane basins in Idaho were compiled. A similar report for intermontane basins in Mortana has been published (Dutton and others, 1995) by the U.S. Geological Survey in Montana. In northern Idaho, well data were collected in the Kootenai River, Priest River, Pack River, Pend Oreille, Rathdrum Prairie, Coeur d'Alene River, Clark Fork, and St. Maries River/St. Joe River Basins. In central Idaho, well data were collected in the Long Valley, Round Valley (Payette), Pahsirreroi River, Round Valley (Challis), Lemhi River, Sawtooth, Birch Creek, Camas Creek, Little Lost River, Big Lost River, and Big Wood River/Silver Creek Basins. Most intermontane basics in northern and central Idaho (fig. 1) contain consolidated to poorly consolidated basin-fill deposits of Tertiary and Quaternary age that commonly are saturated with water (Whiteh^ad, 1994). Unconsolidated deposits compose the most important aquifers in the intermontane basins but, in places, the underlying Pliocene and younger basaltic or Miocene basaltic ricks compose important aquifers (Whitehead, 1994). Most of the wells inventoried were completed in the unconsolidated deposits. The quantity and quality of ground water are major regional and local concerns. In many basins, ground water is the only source of adequate quantity and suitable quality for publicsupply, domestic, stock, irrigation, commercial, and industrial uses (Solley and others, 1993). Expanded water use that results from increased demand requires that the water supply for each basin be accurately quantified and managed wisely; however, little information is available about the ground-water resources. This report summarizes the geohydrologic data that were collected and compiled in 1991 as part of the RASA in khho. All data were stored in the National Water Information System ground-water data base (Mathey, 1990) and can be obtained for a nominal charge in several formats from the "information" address on the back of the title page.

Selected geohydrologic data from a regional aquifer-system analysis of the Northern Rocky Mountains intermontane basins in Idaho