Deposits

Oregon Department of Geology and Mineral Industries 2024 Deposits vector digital data Oregon Department of Geology and Mineral Industries Open-File Report O-24-10 Portland, Oregon, USA Oregon Department of Geology and Mineral Industries https://www.oregon.gov/dogami/pages/default.aspx Oregon Department of Geology and Mineral Industries 2024 Landslide Inventory and Risk Reduction, Grant County, Oregon 1.0 Oregon Department of Geology and Mineral Industries Open-File Report O-24-10 Portland, Oregon, USA Oregon Department of Geology and Mineral Industries https://www.oregon.gov/dogami/pages/default.aspx The landslide inventory is intended to provide users with basic information regarding landslides. This feature class consists of polygons delineating landslide deposits (including debris flow fans and talus extent).The Study Area feature class is equal to the project study area boundary. This includes about 103 square miles in western Hood River County The landslide inventory is intended to provide users with basic information regarding landslides. The geologic, terrain, and climatic conditions that led to landslides in the past may provide clues to the locations and conditions of future landslides, and it is intended that this data will provide useful information to develop regional landslide susceptibility maps, to guide site-specific investigations for future developments, and to assist in regional planning and mitigation of existing landslides. 2024-07-01 00:00:00 Complete As needed -119.654458 -118.624531 44.844745 44.294202 ISO 19115 Topic Category geoscientificinformation Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus landslide deposit geologic hazard Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus soil surface alluvium sediment Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus United States North America Oregon Grant None MAP DATA: This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, or surveying purposes. Users of this information should review or consult the primary data and information sources to ascertain the usability of the information. This publication cannot substitute for site-specific investigations by qualified practitioners. Site-specific data may give results that differ from the results shown in the publication. Oregon Department of Geology and Mineral Industries mailing and physical address

800 NE Oregon Street Suite 965

Portland Oregon 97232 USA 1 971 673 1555 1 971 673 1562 dogami-info@dogami.oregon.gov When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from https://www.oregon.gov/dogami/pages/default.aspx William J. Burns Oregon Department of Geology and Mineral Industries The project described in this publication was supported in part by Federal Emergency Management Agency (FEMA) Cooperating Technical Partner, Cooperative Agreement EMS-2020-CA-00010. Unclassified Relevant attributes from SP-42 were filled in when applicable and visually checked for accuracy. Landslide polygons were mapped and attributed for this landslide inventory specific study using Special Paper 42 methodology. Some landslide polygons may extent outside the study extent. This Deposits feature class includes all landslide deposit polygons within the county study area. The study area includes about 300 square miles in the most densely inhabited portions of central and western Grant County. Landslides that are smaller than 100 square meters (1,075 square feet) may not be identified due to the resolution of the lidar data and air photos used in this project area. The line work was captured by heads up digitizing at several different scales; 1:24,000 (the native scale of standard printed 7.5-minute topographic quadrangles), 1:10,000, and 1:4,000. All lines were relocated at a scale of 1:4,000 to ensure that all spatial data (lines) have been mapped consistently. Line work is published at a maximum scale of 1:8000 which is also the recommended use scale. Base map used for digitization was DOGAMI bare earth lidar. Lidar data quality requires that the average departure from planarity within any 10 meters by 10 meters area shall be no greater than 5 cm. However the accuracy may still vary. Lidar-derived bare earth elevation model vertical accuracy is typically less than 1 foot. Oregon Department of Geology and Mineral Industries 2009 Protocol for Inventory Mapping of Landslide Deposits from Light Detection and Ranging (Lidar) Imagery Not Applicable Oregon Department of Geology and Mineral Industries Special Paper SP-42 Portland, Oregon, USA Oregon Department of Geology and Mineral Industries https://www.oregongeology.org/pubs/sp/p-SP-42.htm 2009 Burns and Madin, 2009 This data was prepared using a wide variety of interpretation methods, including aerial photos, field work, map digitizing, and methods following the Protocol for Inventory Mapping of Landslide Deposits from Light Detection and Ranging (Lidar) Imagery developed by Burns and Madin (DOGAMI Special Paper 42, 2009). In the Special Paper 42, the three primary tasks include compilation of previously mapped landslides, lidar-based morphologic mapping of landslide features, and review of aerial photographs. Landslides identified by these methods are digitally compiled into this database at varying scales. While the protocol recommends data use at a map scale of 1:8,000, and the geodatabase contains data at 1:8,000 or better, for representation purposes the data have been visualized on the map plate at 1:32,000. Each landslide is also attributed with classifications for activity, depth of failure, movement type, and confidence of interpretation. Burns and Madin, 2009 Oregon Department of Geology and Mineral Industries mailing and physical address

800 NE Oregon Street Suite 965

Portland Oregon 97232 USA 1 971 673 1555 1 971 673 1562 dogami-info@dogami.oregon.gov When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from https://www.oregon.gov/dogami/pages/default.aspx Deposits UNIQUE_ID Unique code assigned by data steward to each landslide poygon in database. DOGAMI TYPE_MOVE Each landslide should be classified into one the following types of movement: 1) slides 2) flows, 3) spreads, 4) topples, 5) falls, 6) complex. DOGAMI MOVE_CLASS Landslides should be differentiated by the kinds of material involved and the mode of movement. DOGAMI MOVE_CODE Movement code combining type of movement and type of material. For example, debris flow would be DFL. DOGAMI CONFIDENCE Confidence of identification: high, moderate, low. DOGAMI AGE Estimated age: historical landslide age less than 150 years, prehistorical greater than 150 years. DOGAMI NAME Landslide name. DOGAMI GEOL Geologic unit that the landslide occurred. DOGAMI SLOPE Adjacent slope angle, in degrees. DOGAMI HS_HEIGHT Change in elevation from bottom to top of head scarp, in feet. DOGAMI FAN_HEIGHT Change in elevation from top to toe of fan, in feet. DOGAMI FAIL_DEPTH Estimate and/or calculated slope normal thickness of failure depth, in feet. DOGAMI DEEP_SHAL The landslide is shallow seated (less than 15ft) or deep seated (greater than 15ft). DOGAMI HS_IS1 Horizontal distance from head scarp to internal scarp no. 1, in feet. DOGAMI IS1_IS2 Horizontal distance from internal scarp no. 1 to internal scarp no. 2, in feet. DOGAMI IS2_IS3 Horizontal distance from internal scarp no. 2 to internal scarp no. 3, in feet. DOGAMI IS3_IS4 Horizontal distance from internal scarp no. 3 to internal scarp no. 4, in feet. DOGAMI HD_AVE Calculated average horizontal distance between scarps, in feet. DOGAMI DIRECT Direction of movement, in degrees. DOGAMI AREA Size of landslide deposit, in square feet. DOGAMI VOL Volume of landslide deposit, in cubic feet. DOGAMI REF_ID_COD Unique code assigned by data steward to each original reference map. DOGAMI MAP_UNIT_L Map unit label: reference map unit label symbol taken from the original source map. DOGAMI DESCRIPTION Unit descriptor: landslide, flow, talus-colluvium. DOGAMI YEAR Year of landslide failure. DOGAMI DATE_RANGE Date range of landslide failure. DOGAMI REACTIVATION Date of reactivation of previous landslide failure. DOGAMI MONTH Month of landslide failure. DOGAMI DAY Day of landslide failure. DOGAMI This feature class consists of polygons delineating landslide deposits (including debris flow fans and talus extent).The Study Area feature class is equal to the project study area boundary. This includes about 103 square miles in western Hood River County Oregon Department of Geology and Mineral Industries mailing and physical address

800 NE Oregon Street Suite 965