By: F. X. Ashland, G. N. McDonald, L. M. Shaw, and J. A. Bay
Contains a 31-page report and two accompanying plates detailing the results of geologic and geophysical investigations of the Meadow Creek landslide in western Kane County, Utah, between October 2005 and June 2007. The roughly 1.7 miles wide by 1.3 miles long Meadow Creek landslide is part of the Coal Hill landslide complex just east of Zion National Park. Recurrent movement of the Meadow Creek landslide affects State Route 9, which provides the only highway access to the east entrance to Zion National Park. This report presents the results of our investigation that includes detailed mapping of landslide features and individual historical landslides within the complex; landslide geometry, including depths from geophysical testing; a road damage inventory; movement amounts and rates from survey-grade GPS monitoring; and distress- and movement-based relative hazard zonation of State Route 9 and the Meadow Creek landslide. The results of this study provide a better understanding of the landslide and its relation to highway distress and aid in assessing the feasibility of mitigation options and predicting future damage.
Pages: 29 p. + 1 p. appendix
Plates: 2 pl.
Location: Kane County