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Highly detailed General Land Office Map of Colorado, prepared by Charles Roeser.
The map is one of the most detailed maps of Colorado published in the 1870s and shows the progress of the GLO's surveys, which have now completed about 65% of the Township subdivisions. The principal meridians and base lines are labeled.
Excellent topographicl detail in the Rocky Mountains, although there are still some notable areas that are completely unsurveyed, including the area south of Mt. Powell and north of Breckenridge and large tracts of land in the west and southwest.
These early GLO maps of Colorado show the progress of both the surveys and the settlement of the Territory, as the mining boom fanned out westward from its origins along the Eastern slopes.
The General Land Office (GLO) refers to the independent agency in the United States that was in charge of public domain lands. Created in 1812, it assumed the responsibilities for public domain lands from the United States Department of the Treasury. The Treasury had overseen the survey of the Northwest Territory, but as more area was added to the United States, a new agency was necessary to survey the new lands.
Eventually, the GLO would be responsible for the surveying, platting, and sale of the majority of the land west of the Mississippi, with the exception of Texas. When the Secretary of the Interior was created in 1849, the GLO was placed under its authority. Until the creation of the Forest Service in 1905, the GLO also managed forest lands that had been removed from public domain. In additional to managing the fees and sales of land, the GLO produced maps and plans of the areas and plots they surveyed. In 1946, the GLO merged with the United States Grazing Service to become the Bureau of Land Management.
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