| Maps in the
1:250,000-scale series are available for the entire United States. They were originated by
the U.S. Army Map Service during the 1950's but are now maintained by the USGS. This series serves as base maps for aeronautical charts and geologic maps, for geographic reference, and in planning regional land use, transportation, and utility systems. Elevation data, derived from the contours on these maps, are available from any ESIC. |
 Part of "Rolla, Missouri-Illinois," 1989, 1:250,000, Universal Transverse Mercator projection, 36 x 22 inches |
| Conterminous United States. Quadrangles are 1 degree of latitude by 2 degrees of longitude. Along the coasts dimensions are modified to fit some maps. The series consists of 489 sheets. Ground area shown varies with latitude, from 8,218 square miles at 30 degrees North to 6,222 square miles at 49 degrees North. Sheet size is about 32 x 22 inches. About 8 percent of these sheets have been replaced by folded metric maps, about 36 x 22 inches in size. | |
Hawaii. Quardrangles are 1 degree of latitude and from 1 degree 30 minutes to 1 degree 35 minutes of longitude. Ground area mapped is from 6,645 to 6,990 square miles. Sheet size is about 29 x 22 inches. Alaska reconnaissance series. This 153-sheet series covers the mainland and adjacent islands. It is being superseded by the Alaska 1:250,000-scale series. Quadrangles are 1 degree of latitude and from 2 to 3 degrees of longitude. Ground area mapped is from 5,105 to 6,030 square miles for 1- x 2- degree quadrangles and from 4,580 to 7,310 square miles for 1- x 3- degree quadrangles. Sheet size is about 32 x 22 inches. Alaska 1:250,00-scale series. Quadrangles, ground areas, and sheet size match those in the reconnaissance series, but the source data are more accurate. Hypsographic (terrain relief) information is more generalized than on larger scale maps. Because the contour interval is 50, 100, 200, or 500 feet, many small relief features are not shown on this series |
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