The angular difference between the geographic and the magnetic meridians at a point on the earth is called magnetic declination. The values for magnetic declination in Wisconsin vary today from -4.0° in Door County to +1.5° in the west-central part of the state. While these values are not as great as the +20° declination in Seattle, Washington, they are still of concern to surveyors, map makers and navigators, and others who use maps or compasses.
The Sanborn Fire Insurance Maps are a valuable resource for genealogists, historians, urban planners, teachers or anyone with a personal connection to a community, street or building. The maps depict more than 12,000 American towns and cities. They show the size, shape and construction materials of dwellings, commercial buildings, factories and other structures.
In Wisconsin, the Legislative Technology Services Bureau (LTSB) GIS Team works closely with local governments to maintain a statewide layer of municipal boundaries (cities, villages, and towns). Counties are required by state law to submit updated municipal boundary data to LTSB.
The University of Wisconsin Sea Grant Institute and State Historical Society of Wisconsin (SHSW) have produced diving guides for seven of Wisconsin’s Lake Superior shipwrecks.
A variety of map types include a representation of the PLSS. These maps cover a range of scales and accuracies.
We offer a variety of digital outline maps for use in various graphics, illustration, or office software. The map graphics available for download have been derived from several common layers of digital GIS data. All of the statewide GIS data layers used were processed by state agencies and exist in the Wisconsin Transverse Mercator coordinate system.
There are several sources for Wisconsin County Maps. Below we have included some information and links to pertinent map sources.
Wisconsin is home to more than 25,000 miles of top-quality trails that link every corner of the state. Start here for more information on where to find snowmobile trail maps.
The U.S. Geological Survey (USGS) produces 1:100,000-scale county maps for each of the 72 counties in Wisconsin. These maps show topographic features including contours and elevation in meters, highways, roads and other manmade structures, water features, woodland areas, and geographic names. These maps vary in size depending on the particular county. USGS county maps in Wisconsin were generally produced between 1976 and 1990.
Where to find the “best” lake map is a common question we receive each spring as fishing season approaches. Start here for more information on lake and lake depth (bathymetric) maps.