Liquefaction Analysis of Holmes Creek Dam, Davis County Utah

Holmes Reservoir is an off-stream reservoir in Layton, Davis County, Utah. It is located on the Wasatch Front near the Weber segment of the Wasatch Fault.
Apparently, Holmes Dam was constructed in phases, beginning just prior to 1900 and ending in 1922, using hydraulic fill methods. The fill was obtained from a borrow area on the south side of the reservoir which remains visible today. The material remaining in the borrow source near the left abutment is primarily a brown to yellowish silty sand.
The dam is approximately 60 feet high at its maximum section, and 370 feet long, with a storage capacity of about 1,050 acre-feet. It appears that the original intent was to build the dam somewhat higher than its present height because the top width is about 60 feet. The reservoir is generally filled in the late winter to early spring by diverting water from the Holmes Creek drainage through a pipeline and/or an open ditch. There are only a few hundred acres of runoff that directly enter the reservoir. The main drainages in the immediate area are from the Wasatch mountain canyons immediately south and immediately north of Holmes Reservoir. The reservoir water is stored for irrigating farm land and providing irrigation water to some of the nearby subdivisions. CONT.