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Trail section grade estimates were derived using the section rise over run method found in Trail Impact Monitoring in Forest Park to be most accurate compared to grade measurements obtained in the field. Sections that qualified as primarily hiker-only with Width_Avg </= 5 feet wide and Name does not include the text 'Line', 'Road', 'Drive' or 'Demand'. These calculations were made in the NAD_1983_2011_Oregon_Statewide_Lambert_Feet_Intl_1 projection.