Design snow load shall meet the greater value of either UFC or Pierce County snow load. As of December 2022, the greater value is Pierce County’s modification to 1608.2 found here:
Ch. 17C.20 International Building Code | Pierce County Code
“1608.2 Ground snow loads. The ground snow loads to be used in determining the design snow loads for roofs shall be 25 pounds per square foot for elevations up to 700 feet. Ground snow load determination for sites above 700 feet shall be based on the "Snow Load Analysis for Washington" prepared by the Structural Engineers Association of Washington as approved by the building official.”