"Map of the Official Survey of the Fossil Creek Reservoir Belonging to the North Poudre Irrigation Co. Located in Water District No. 3 Surveyed by State Engineer of Colorado", 1903

The series includes maps, master plans, blueprints, and profiles created by the U.S. Geological Survey, the U.S. Department of Agriculture, and other organizations. Also here are plans for the Anheuser-Busch Fort Collins Brewery and various posters, including some by the Colorado Water Education Foundation and SavethePoudre.org. Many of the items concern the entire state, but some focus on localized water bodies. The 2011 accession added the rolled map "Detailed map of the Colorado River through the Grand Canyon - for river rafting" to the "Maps" category. Two oversized maps were added in 2014, and four maps and one poster were added in 2018. Items are arranged alphabetically by category or material type, with rolled items in tubes listed at the end.