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CENWS-END-G Klocke Levee <br />Seattle District, US Army Corps of Engineers Routine Inspection <br />At the time of the inspection the levee toe appeared to be leaded by a few feet and United States <br />Geologic Survey (USGS) Station No. 12484500 indicates an average river height of 31 feet and <br />discharge of 1400 cubic feet per second. <br />In addition to the main body, the report also includes: <br />Appendix A: Levee Maps; <br />Appendix B: Inspection Point Summary with Photos; <br />Appendix C: Public Sponsor Pre -Inspection Form; <br />Appendix D: Inspection Rating Checklist; and <br />Appendix E: Rehabilitation Program Eligibility Determination Worksheet. <br />OBSERVATIONS <br />General <br />The levee is in generally good condition overall, but has several areas where improvements could <br />be made. There is currently a repair project identified in PIR YAK -16-04 from approximately <br />station 36+50 to 38-00. Specific items are listed below, along with possible impacts to levee <br />performance. <br />Unwanted Vegetation Growth <br />The presence of trees and brush along the slopes of the levees occurred in multiple locations <br />extending from Station 6+50 to 37+00, within the vegetation free zone as defined in ETL 1110-2- <br />583 (IDs 0002, 0003, 0008, 0010, 0015). The presence of brush and vegetation can hinder the <br />ability to thoroughly inspect features of flood risk reduction features. In addition the presence of <br />roots within the levee prism may lead to seepage and piping due to degradation of the roots. <br />Encroachments <br />Within the prism of the levee, a few encroachments were noted: <br />• Gate across the crown of the levee at Station 8+50, sponsor has key (ID 0015) <br />• Fencing at the landward toe at Station 11+50, (ID 0013) <br />• Power poles in landward slope and crown (ID 0006) <br />The location of structures and the storage of materials and features can adversely affect the overall <br />performance or access to a levee during a flood event. Depending on the size and mass of an <br />encroachment, surcharge loads can create stability issues along the levee embankment. <br />Erosion / Bank Caving <br />Previous inspections identified erosion and bank caving extending from Station 36+50 to 38+00. <br />At the time of the site visit on 6 December 2017, unwanted vegetation prevented inspection if this <br />region (ID 0001). Degradation of the levee prism and riverward slope can lead to additional scour <br />and slope stability issues if not addressed. <br />Page 2 of 6 <br />FOR OFFICIAL USE ONLY <br />