Dale R. Rankin 1999 The Albuquerque Basin, located in central New Mexico, is about 100 miles long and 25 to 40 miles wide. The basin is defined as the extent of Cenozoic deposits that encompass the structural Rio Grande Rift within the basin. Drinking-water supplies throughout the Albuquerque Basin are obtained solely from ground- water resources. The population of the basin grew from 419,000 in 1980 to 563,600 in 1990, a 34-percent increase, and resulted in increases in water demand and ground-water pumpage. From April 1982 through September 1983, a network of wells was established to monitor changes in ground-water levels throughout the Albuquerque Basin. Water-level data are currently (1998) collected at 88 wells and piezometers. This report includes water-level data from most of these sites for the period of record through 1998. Data collection at sites 6, 21, 27-29, 31, 35, 56-60, 77, 87, and 88 was interrupted due to construction or limited access, and does not extend through the reporting period. Data are currently collected annually at sites 11 and 56-60; semiannually at sites 1-10, 78, and 85; quarterly at sites 12-55, 67-77, 79, 80, 82-84, 87, and 88; and monthly at sites 61-63, 81, and 86. Water levels are recorded hourly at sites 64-66. application/pdf 10.3133/ofr99269 en U.S. Geological Survey Water-level data for the Albuquerque Basin and adjacent areas, New Mexico, period of record through 1998 reports