Investigations of the Possible Underground Extent of La Posta Quemada Sinkhole, Colossal Cave Mountain Park, Pima County, Arizona

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Author
Cook, J.P.
Issue Date
2018-06-11
Keywords
Arizona Geological Survey Open File Reports
Early Mississippian
Holocene
Historic
La Posta Quemada Wash
Vail
Pima County
Rincon Mountains
Colossal Cave
Escabrosa Limestone

Metadata
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Citation
Cook, J.P., 2018, Investigations of the Possible Underground Extent of La Posta Quemada Sinkhole, Colossal Cave Mountain Park, Pima County, Arizonl. Arizona Geological Survey Open-File Report OFR-18-01, 19 p, 4 appendices.
Publisher
Arizona Geological Survey (Tucson, AZ)
Description
The purpose of this investigation is to assess the possible underground extent of a sinkhole in Colossal Cave Mountain Park southeast of Tucson near Vail, Arizona (Figure 1). The sinkhole is located in a low terrace adjacent to La Posta Quemada (LPQ) Wash. In this report the sinkhole is referred to as LPQ sink. LPQ sink has grown in volume and extent since its initial appearance in the fall of 1994 and has undermined a park road used to access La Selvilla campground and picnic area. Park visitors must now detour around the sinkhole into LPQ Wash in order to access the campground. Colossal Cave Mountain Park is a Pima County park currently operated by Ortega National Parks LLC. Fencing and signage prohibiting entrance was installed around LPQ sink to prevent injury to park visitors unaware of the unstable nature of the sinkhole and surrounding area. Unfortunately, LPQ sink has continued to grow in size over the past several years and now extends beyond the fenced area. The Pima County department of Finance and Risk Management contracted with the Arizona Geological Survey (AZGS) in the fall of 2017 to assess the extent of underground voids associated with LPQ sink in order to predict the limits of possible surface collapse. To best delineate the extent of underground voids AZGS employed a combination of surface mapping, detailed surface topography surveys, and geophysical surveys including microgravity and electrical resistivity void mapping.
URI
http://hdl.handle.net/10150/630765
Additional Links
https://library.azgs.arizona.edu/item/AOFR-1552429219637-2
Language
en
Series/Report no.
OFR-18-01
Rights
Arizona Geological Survey. All rights reserved.
Collection Information
Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.
North Bounding Coordinate
32.0891
South Bounding Coordinate
32.0798
West Bounding Coordinate
-110.603
East Bounding Coordinate
-110.581
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