Trout Stream Maps

November 3, 2017

The Wisconsin DNR maintains a very nice page with links to countywide trout stream maps.  Both black & white and color maps are available that show the location and stream classification. The DNR page also contains direct links to online interactive maps for additional stream information.

Magnetic Declination

August 21, 2017

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.

Historic Sanborn Fire Insurance Maps

July 21, 2017

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.

Municipal Boundary Data

July 13, 2017

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. 

SCUBA Diving Maps

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.