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Kittitas County,WA <br /> § 17A.04.050 CRITICAL AREAS § 17A.04.050 <br /> feasible; <br /> e. Stream crossings, where necessary, shall be perpendicular with the stream, or as close to <br /> perpendicular as possible, and shall be the minimum width necessary. Common or shared <br /> crossings are the preferred approach where multiple properties can be accessed by one crossing; <br /> and <br /> f. Culverts and bridges shall be designed according to applicable state and federal guidance criteria <br /> for fish passage as identified in Fish Passage Design at Road Culverts,WDFW,2003,and/or the <br /> National Marine Fisheries Services Guidelines for Anadromous Salmonid Passage Facility <br /> Design, 2011, (and subsequent revisions) or WDFW's Water Crossing Design Guidelines <br /> (WDFW,2013).The applicant or property owner shall maintain fish passage through the culvert. <br /> 5. Utility facilities. New utility lines and facilities may cross streams or Fish and wildlife habitat <br /> conservation areas if they comply with the following standards,and those standards described in KCC <br /> § 17A.01.120.4: <br /> a. There is no other feasible alternative route with less impact on the Fish and wildlife habitat <br /> conservation area; <br /> b. Installation at a stream crossing shall be accomplished by boring beneath the scour depth and <br /> hyporheic zone of the stream and the entire channel migration zone width,where feasible; <br /> C. Where boring under the channel is not feasible.the utilities shall cross at an angle of no less than <br /> sixty(60)degrees,but as close to ninety(90)degrees as possible,relative to the centerline of the <br /> channel; <br /> d. Crossings shall be contained within the footprint of an existing road, bridge or utility crossing <br /> where possible; <br /> e. The utility route shall avoid paralleling the stream or following a down-valley course near the <br /> channel; and <br /> f. The utility installation shall not increase or decrease the natural rate of channel migration. <br /> 6. Instream structures.-The structure shall be designed to avoid modifying flows and water quality in <br /> ways that may adversely affect habitat conservation areas. <br /> 7. Stormwater conveyance and discharge facilities. Stormwater conveyance or discharge facilities such <br /> as dispersion trenches, level spreaders, and outfalls may be placed within the outer 25%of a standard <br /> fish and wildlife habitat conservation area buffer on a case-by-case basis when the Director determines <br /> that all the following are met: <br /> a. Due to topographic or other physical constraints, there are no feasible locations for these <br /> facilities outside the standard fish and wildlife habitat conservation buffer; <br /> b. The discharge is located as far from the ordinary high water mark(OHWM) as possible and in <br /> a manner that minimizes disturbance of soils and vegetation; <br /> C. The discharge outlet is located in the outer 25%of the standard buffer and is designed to prevent <br /> erosion and promote infiltration; and <br /> Downloaded from https:Hecode360.com/KI6857 on 2025-05-15 <br />