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2025 Hazard Mitigation Plan <br />Kittitas County, Washington <br />southeastern edge along the Columbia River. Within these elevations, slope, geologic, and soilconditions <br />vary dramatically (i.e., steep mountain peaks, foothills, broad rich valleys, and near-desert areas). <br />Alpine and continental glaciers moved through this region shaping the mountains and depositing <br />materials to create the geology and soils of the region. The primary types of glacial deposits in the County <br />are outwash and till. Outwash consists of unconsolidated sand, gravel and rocks and results from runoff <br />of melting glaciers, and it is usually loose and highly permeable. Glacial till (i.e., hardpan), consists of <br />unsorted clay, sand, gravel, or rock that has been compacted by the weight of the glacial ice into a highly <br />impervious, concrete-like material..l 0 <br />3.2.2. Soils <br />Kittitas County soils were formed by the forces of water, heat, time, vegetation and animal life, acting on <br />the geologic parent material. The principal parent material consists of sand and gravels associated with <br />glacial till and outwash. Highly organic soils were developed in a moist climate under a rich covering of <br />vegetation. Figure 3-2 shows the County soil map that is available through the United States Department <br />of Agriculture (USDA). Soil maps are useful for determining general limitations and character of soils. <br />10 Kittitas County. (n.d.). Comprehensive Flood Hazard Management Plan. Retrieved from <br />https://www.co. kittitas.wa.us/u ploads/documents/public- <br />works/flood/documents/1996%20Kittitas%20Countv%20Comprehensive%20Flood%20Hazard%20Manasement% <br />20Plan.pdf. <br />Chapter 3: Community Profile 19