King City Reservoir system at King City, Missouri, 2019

Water supply lakes are the primary source of water for many communities in northern and western Missouri. Therefore, accurate and up-to-date estimates of lake capacity are important for managing and predicting adequate water supply. Many of the water supply lakes in Missouri were previously surveyed by the U.S. Geological Survey in the early 2000s (Richards, 2013) and in 2013 (Huizinga, 2014); however, years of potential sedimentation may have resulted in reduced water storage capacity. Periodic bathymetric surveys are useful to update the area/capacity table and to determine changes in the bathymetric surface. The King City Reservoir system is a set of water supply lakes used by the city of King City in northwestern Missouri. The three main lakes have a combined surface area of about 48 acres at the flood pool level of the emergency spillway (approximately 1,038.2 feet above the North American Datum of 1988 for the lower and middle lakes, and approximately 1,053.2 feet above the North American Vertical Datum of 1988 for the upper lake). A previous bathymetric survey had been completed at this lake in July 2000 with a single-beam echosounder, but was not reported. In September 2019, the U.S. Geological Survey, in cooperation with the Missouri Department of Natural Resources and the City of King City, completed a bathymetric survey of the King City Reservoir system using a multibeam echosounder. The water-surface elevations during the survey were about 1051.24, 1035.36, and 1034.74 feet in the upper, middle, and lower lakes, respectively. The echosounder data can be combined with light detection and ranging (lidar) data to prepare a bathymetric map and a surface area and capacity table for the lakes. The gridded bathymetric point data (KingCityRes2019_bathy_pts.zip) were computed on a 0.82-foot (0.25-meter) grid using the Combined Uncertainty and Bathymetry Estimator (CUBE) method, which is used as the source of points to create the bathymetric surface for the three lakes. Bathymetric quality-assurance data (KingCityRes2019_QA_raw.zip) were collected to evaluate the vertical accuracy of the gridded bathymetric point data. Each of these two zip files contains a shapefile with an attribute table. Attribute/column labels of each table are described in the "Entity and attribute" section of the metadata file. References Cited: Huizinga, R.J., 2014, Bathymetric surveys and area/capacity tables of water-supply reservoirs for the city of Cameron, Missouri, July 2013: U.S. Geological Survey Open-File Report 2014–1005, 15 p., http://dx.doi.org/10.3133/ofr20141005. Richards, J.M., 2013, Bathymetric surveys of selected lakes in Missouri—2000–2008: U.S. Geological Survey Open-File Report 2013–1101, 9 p. with appendix, http://pubs.usgs.gov/of/2013/1101.

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