Commercial production of ethanol in the San Luis Valley, Colorado. Final Report Page: 80 of 222
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released into Chessman Lake in the upper part of the South Platte River in 1976. The
Chessman Lake area and other areas which the Colorado Division of Wildlife has identi-
fied as essential habitat for the river otter are located outside the San Luis Valley
(U.S. Department of Interior, 1979).
The upper Rio Grande and its tributaries were the historic range of the
Rio Grande cutthroat trout. There are indications, however, that the Rio Grande does
not at present contain this species. It requires clear, cold and well-oxygenated streams
(U.S. Department of Interior, 1979).
18.104.22.168 Cultural Resources
Although the San Luis Valley is an area of great significance in the history
of Colorado and New Mexico, until recently little published information indicating spe-
cific historic and prehistoric sites was available. Mexico ceded the area to the United
States in 1848. pursuant to the Treaty of Guadalupe Hidalgo, which ended the Mexican
War. The first permanent settlement was established in 1852 at San Luis by Spanish-
Americans from northern New Mexico seeking arable lands. European immigrants
began immigrating to the valley after 1868 when the Indians relinquished their claims to
the valley (San Luis Valley Regional Development and Planning Commission).
Both the Ute Indians and Indians from the Rio Grande pueblos apparently
used the valley on a seasonal basis (U.S. Department of the Interior, 1979). The United
States Department of the Interior, Water and Power Resources Service (WPRS) (for-
merly "Bureau of Reclamation") is currently conducting cultural resource surveys in
conjunction with the San Luis Valley Project -- Colorado Closed Basin Division. WPRS
archaeologists anticipate the following survey results:
1. Presence of prehistoric cultural materials, which indicates "num-
erous short-term occupations and limited activity areas deposited
over the course of more than 10,000 years."
2. "Deposits of cultural materials should be concentrated on the bor-
ders of ancient permanent ponds and seasonal wetlands, with
occasional sparse 'outcrops' of artifacts representing limited
activity areas more generally distributed."
3. No permanent structures in the project area, and "midden deposits
representing either long-term occupation or repeated occupations
of the same location by a large group are anticipated to be rare to
absent." (U.S. Department of the Interior, 1979).
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Hewlett, E.M.; Erickson, M.V.; Ferguson, C.D.; Sherwood, P.B.; Boswell, B.S.; Walter, K.M. et al. Commercial production of ethanol in the San Luis Valley, Colorado. Final Report, report, July 1, 1983; United States. (digital.library.unt.edu/ark:/67531/metadc874948/m1/80/: accessed March 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.