Maps

This series of historic maps, made possible in part by the Honorable Greg Hobbs, shows the historical development of Boulder's historic landscape. From early explorers to negotiations over appropriations of the Colorado River, these maps outline the geographical history of Colorado.

Right: Hayden's Geologic Map of Northern Central Colorado

  • Stephen Long's Expedition, 1820
  • Map of the Upper California, 1841
  • Fremont's Route, 1845
  • An Explorer's Daily Distance, 1845
  • Map of Kanzas and Nebraska Territory, 1855
  • War Department Explorations and Surveys, 1858
  • Hayden's Triangulation Map of Colorado, 1877
  • Hayden's Drainage Map of Colorado, 1877
  • Hayden's Geologic Map of Colorado, 1877
  • Boulder City and County, 1881
  • Plat of Water Districts No 5 and 6, 1888
  • Boulder's Forests and Ditches, 1905
  • Water Development on Boulder Creek, 1907
  • Colorado River Compact, 1922
  • Colorado River Basin Graphs, 1922
  • Platt's Drainage Basin Map, 1966
  • Water Master Plan of Boulder Creek Basin, 1985
  • Colorado Historic Average Annual Streamflows, 2003
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