Landslide monitoring data for the Cleveland Corral landslide near U.S. Highway 50, El Dorado County, California

The Cleveland Corral landslide complex located near U.S. Highway 50 in El Dorado County, California is episodically active. This USGS data release presents graphical and tabular data from near real-time monitoring of the Cleveland Corral landslide conducted between 1997 and 2018. The monitoring data include 15-minute and daily measurements (in separate files) for four types of sensors on the landslide: 1) piezometers that recorded subsurface pore-water pressures at different depths and locations within the slide mass, 2) extensometers that recorded downslope displacement of the slide ground surface at different locations throughout the slide, 3) volumetric water content sensors that measured soil moisture at the toe of the landslide, and 4) one rain gauge that recorded precipitation, including rainfall and snowmelt. Descriptions of the sensors, their geographic locations, the time periods (monitoring time lines) when they were operating, and construction diagrams for the piezometers are included. Data were recorded using data-acquisition systems and radio telemetry developed by the USGS Volcano Hazards Program (Hadley and LaHusen, 1995). Files containing daily values enable rapid plotting of overall trends whereas 15-minute data can reveal detailed responses. Both sets of files are organized by water year, starting October 1; all times are Pacific Standard Time.
 
This data release consists of:
1) graphic of sensor locations (.png format),
2) UTM coordinates of sensors prior to 1999 (.csv format)
3) UTM coordinates of sensors in 2011 and 2017 (.csv format)
4) graphic of monitoring time lines, showing individual sensor histories (.png format),
5) 15-minute near-real time monitoring data (.csv format),
6) daily monitoring data – daily maxima for rainfall and medians (of the 15-minute data) for other sensors (.csv format), 
7) description of sensors (.csv format), and
8) piezometer construction diagrams (.png format).

Additional information about the Cleveland Corral landslide complex and links to related data releases can be found on the ScienceBase project page https://www.sciencebase.gov/catalog/item/65a821ecd34ebad3f34c9a4b.

References Cited
Hadley, K.C. and LaHusen, R.G.,1995, Technical Manual for an Experimental Acoustic Flow Monitor (USGS Open-file Report 95-114, pp. 1–25). US Geological Survey, Reston, VA.

Reid, M.E., and Brien, D.L., 2019, Debris-flow initiation promoted by extension within a slow-moving landslide, in Seventh International Conference on Debris-Flow Hazards Mitigation, p. 824-831.

Reid, M.E., and LaHusen, R.G., 1998, Real-time monitoring of active landsides along Highway 50, El Dorado County: California Geology, v. 51, no. 3, p. 17-20.

Spittler, T.E., and Wagner, D.L., 1998, Geology and slope stability along Highway 50: California Geology, v. 51, no. 3, p. 3-14.

Sydnor, R.H., 1997, Reconnaissance engineering geology of the Mill Creek Landslide of January 24, 1997: California Geology, v. 50, no. 3, p. 74-83.