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2025 Hazard Mitigation Plan <br />Kittitas County, Washington <br /> <br /> <br />Chapter 4: Hazard Identification and Risk Assessment 83 <br />Figure 4-2. High Hazard Dams in Kittitas County <br /> <br /> <br />DSO classifies dams slightly differently than NID. The DSO classification is initially determined using the <br />quantitative evaluation of the population at risk. Additionally, in some cases, a qualitative evaluation <br />includes severity of each deficiency at an individual dam, potential economic and environmental losses, <br />age of the dam, the adequacy warning systems, and the best professional judgement of the DSO <br />engineer assigned to the dam. Refer to the Hazard Extent/Intensity section for further details on DSO’s <br />classification. Table 4-33 lists the dams in Kittitas County with the DSO classification, as of May 2023. <br />There are six (6) dams that are considered high hazard dams, per the DSO’s classification.85F <br />86 <br />Table 4-33. Kittitas County High Hazard Dams with DSO Hazard Classification and <br />Population at Risk <br />Name National <br />ID <br />State <br />ID Location Owner Type Height <br />(feet) <br />Normal <br />Storage <br />(acre-feet) <br />Max <br />Discharge <br />(cubic feet / <br />second) <br />Hazard <br />Category <br />Brown Boys <br />Effluent Pond WA01836 KT39-1836 <br />Yakima <br />River <br />(Offstream) <br />Brown Brothers Earth Fill 10 31 2 3 <br /> <br />86 Washington State Emergency Management Division. (2023). Washington State Enhanced Hazard Mitigation <br />Plan. Retrieved from https://mil.wa.gov/asset/651ec296d76a9/2023_WA_SEHMP_final_20231004.pdf .