This report is a compilation of hydrogeologic data collected through June 1975 as part of the Red River Waterways project in Louisiana. The study was made by the U.S. Geological Survey in cooperation with the U.S. Army Corps of Engineers, New Orleans District, and the U.S. Soil Conservation Service, Alexandria, La. Included are records of 332 wells and test holes, water levels in 324 wells, and drillers ' logs of 316 wells and test holes. Most of the data were collected between July 1968 and June 1975. Well locations are shown. All altitudes given in the tables are referenced to mean sea level. (Woodard-USGS)