This collection contains Sanborn fire insurance maps of cities across Colorado. The CU Boulder Map Library has the most complete collection of Sanborn maps of Colorado outside of the Library of Congress.
The print collection contains maps for approximately 560 cities, beginning in 1883 and ending in 1937.
A subset of this collection has been digitized. The digital collection contains maps of 79 principal cities in 52 counties covering the years 1883-1922.
For your Boulder parks projects, you can access Boulder Sanborns (1880s through 1920s) here and you can access Boulder Sanborns from 1931 here.
The Historical Aerial Photographs of Colorado collection is comprised of more than 20,000 print aerials, which are housed in the Map Library.
For your Boulder parks project, you can access Boulder aerials from 1937 here.
For your Boulder parks project, you can request other decades of aerial coverage of Boulder by emailing libraries@colorado.edu
Click here for more information about the Map Library and guides to digital map collections!