Skip to main content
U.S. flag

An official website of the United States government

All Maps

Explore all USGS Maps and refine your search by type, topic, year, location, and advanced search. 

Filter Total Items: 9495

Map showing configuration and thickness, and potentiometric surface and water quality in the Madison Group, Powder River basin, Wyoming and Montana

With development of the coal resources of the Powder River Basin of Wyoming and Montana the demand for water will increase greatly. The study upon which this report is based was designed to make a preliminary evaluation of the available geo-hydrologic data for the Madison Group, which is an extensive aquifer underlying the Powder River Basin. Large yields from a few wells tapping the Madison indic

Map showing drainage areas, Hartford South Quadrangle, Connecticut

Map shows stream systems and drainage areas that contribute streamflow to selected sites on streams.Drainage areas shown have not been adjusted for the manmade changes in the natural regimens such as storm sewers, diversion dams, canals, and tunnels.