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Kittitas County, WA <br />§ 17A.06.050 KITTITAS COUNTY CODE § 17A.06.070 <br />Downloaded from https://ecode360.com/KI6857 on 2025-05-15 <br /> <br /> <br /> <br />anchored and/or designed so that it will not preclude or interfere with channel migration. Below <br />ground lines shall be of sufficient depth as to not be affected by future channel migration. <br />c. Public roads, bridges, and trails. Public roads, bridges, and trails when no feasible alternative <br />alignment is available. Facilities shall be designed such that the roadway prism and/or bridge <br />structure will not be susceptible to damage from active erosion. <br />d. Stream bank stabilization. Stream bank stabilization may be permitted subject to all of the <br />standards listed in KCC § 17A.04.050. <br />4. CMZ buffers or setbacks. Based upon the results of the channel migration zone assessment, the <br />Director shall prohibit or limit use or development within a channel migration zone and may require <br />a setback or a buffer of undisturbed natural vegetation from the edge of the channel migration zone in <br />accordance with the following: <br />a. The size of the setback or buffer shall be based on the findings of a qualified engineer, <br />engineering geologist, or geologist, licensed in the state of Washington, and shall protect critical <br />areas and processes and minimize the risk of property damage, death, or injury resulting from <br />channel migration; <br />b. The buffer shall include the area subject to bank failure as a result of erosion; and <br />c. If the designated buffer lacks adequate woody vegetation, the Director shall have the authority <br />to require vegetation enhancement or other measures to improve natural channel processes and <br />large wood recruitment. <br />(Ord. 2021-016, 2021) <br /> <br />§ 17A.06.060. Alluvial fan hazard standards. <br />1. Permitted alteration and development. Alluvial fan hazards will be determined by County maps, <br />LIDAR, and aerial photography. The following alterations and development may be allowed in <br />alluvial fan hazard areas, after accounting for restrictions defined by other critical area regulations, <br />when all reasonable measures have been taken to minimize risks and other adverse effects associated <br />with alluvial fan hazards, and when the amount and degree of alteration are limited to the minimum <br />needed to accomplish the alteration or development: <br />a. Roads, utilities, bridges, and other infrastructure. Roads, utilities, bridges, and other <br />infrastructure when located and designed to prevent adverse impacts on critical areas and avoid <br />the need for channel dredging or diking or other maintenance activities that have the potential to <br />substantially degrade river and stream functions. <br />b. Residential and commercial developments. Permanent residential structures and commercial <br />developments shall be allowed in alluvial fan hazard areas only if the alluvial fan has undergone <br />a County-approved study to assess potential hazards, determine risks, and identify mitigation <br />measures and is deemed suitable for development. The Director shall make this determination <br />based on a detailed assessment by a qualified engineer, engineering geologist, or geologist, <br />licensed in the state of Washington, that identifies the risks associated with a 500-year return <br />period debris flow or the maximum credible event that could impact the alluvial fan. <br />c. Accessory structures. Accessory structures not involving human occupancy shall be allowed. <br />(Ord. 2021-016, 2021)