Layer: Wildland Urban Interface (ID: 0)

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Description: OverviewSenate Bill 762 (SB 762), enacted in 2021, was an omnibus bill which advanced a suite of wildfire programs collectively aimed at helping Oregon’s communities and landscapes adapt to a changing fire environment. Under SB762, OSU was responsible for developing three specific data products that would help state agencies develop and implement those wildfire programs in a strategic manner. Senate Bill 762 was amended by Senate Bill 80 in 2023, but OSU is still responsible for three maps to support state agencies:A comprehensive statewide map of wildfire hazard (“statewide hazard map”). Senate Bill 80, Section 1. The map will represent hazard at all locations in Oregon by integrating estimates of annual wildfire likelihood and wildfire intensity, and summarizing the results with each tax lot in the state. Each tax lot will be classified as either “low,” “moderate,” or “high” hazard. The statewide hazard map represents the environmental hazard based on climate, weather, topography and vegetation. A statewide map of the wildland-urban interface (“WUI”). Senate Bill 762, Section 7 (7)(c); and Senate Bill 80, Section 2. The WUI is defined by two general criteria: the density of structures, and the proximity and amount of flammable vegetation. The WUI map represents locations in Oregon where there are enough structures and sufficient flammable vegetation to support a potential future wildfire disaster. A map of locations of socially and economically vulnerable communities. Senate Bill 762, Section 7(7)(d). The map of social vulnerability in Oregon uses 15 indicators collected from the 2020 American Community Survey data summarized at the Census Block Scale. Social vulnerability of each Census block group is represented relative to all other Census block groups. State agencies are not required to use the social vulnerability map and data pertaining to that map are not included in this geodatabase. More information about social vulnerability can be found at: https://ir.library.oregonstate.edu/concern/datasets/z890s265n. The statewide hazard map and the WUI map are intended to be used in conjunction with one another by the Oregon State Fire Marshal and the Department of Consumer and Business Services, Building Codes Division during implementation of specific wildfire programs. Namely:Senate Bill 80, Section 3 directs the Oregon State Fire Marshal to develop minimum defensible space requirements which will apply to all lands that are both within the WUI and classified as high hazard in the statewide hazard map.Senate Bill 80, Section 11 directs the Department of Consumer and Business Services, Building Codes Division to adopt wildfire hazard mitigation building code standards that apply to new dwellings located both in the WUI and on a property classified as high hazard in the statewide hazard map. Wildland-Urban InterfaceCreating a statewide map of the WUI involved two general steps. First, we determined which parts of Oregon met the minimum building density requirements to be classified as WUI. Second, for those areas that met the minimum building density threshold, we evaluated the amount and proximity of wildland or vegetative fuels. Following is a summary of geospatial tasks used to create the WUI. Detailed geospatial processing steps are described in the technical guide here: https://oe.oregonexplorer.info/externalcontent/wildfire/data/SB80_Public_Data.zipDevelop a potential WUI map of all areas that meet the minimum density of structures and other human development - According to OAR 629-044-1011, the boundary of Oregon’s WUI is defined in part as areas with a minimum building density of one building per 40 acres, the same threshold defined in the federal register (Executive Order 13728, 2016), and any area within an Urban Growth Boundary (UGB) regardless of the building density. Step One characterizes all the locations in Oregon that could be considered for inclusion in the WUI on building density and UGB extent alone. The result of Step One was a map of potential WUI which was then further refined into final WUI map based on fuels density and proximity in Step Two. Compile statewide tax lots. Map all eligible structures and other human development. Simplify structure dataset to no more than one structure per tax lotCalculate structure density and identify all areas with greater than one structure per 40 acresAdd urban growth boundaries to all the areas that meet the density requirements from the previous step.Classify WUI based on amount and proximity of fuel. The WUI is also defined by the density and proximity of wildland and vegetative fuels (“fuels”). By including density and proximity of fuels in the definition of the WUI, the urban core is excluded, and the focus is placed on those areas with sufficient building density and sufficient fuels to facilitate a WUI conflagration. Consistent with national standards, we further classified the WUI into three general classes to inform effective risk management strategies. The following describes how we refined the potential WUI output from step one into the final WUI map.Intermix WUI: Areas that met the minimum building density threshold in step one and which had at least 50% vegetative or wildland fuel cover were classified as Intermix WUIInterface WUI: Interface WUI includes areas that met the minimum building density threshold in step one, and which had less than 50% vegetative and/or wildland fuel cover but were within 1.5 miles of a large patch (≥ 2 sq. miles) of at least 75% vegetation and/or wildland fuelsOccluded WUI includes areas that met the minimum building density threshold in step one, and which had less than 50% vegetative and/or wildland fuel cover but were within 1.5 miles of a moderate patch (1 – 2 sq. miles) of at least 75% vegetation and/or wildland fuels.Detailed geospatial processing steps are described in the technical guide available at https://oe.oregonexplorer.info/externalcontent/wildfire/data/SB80_Public_Data.zip

Service Item Id: 72cb33ee5b14499395b086afa737c599

Copyright Text: Data developed by Chris Dunn and Andy McEvoy at Oregon State University (andy.mcevoy@oregonstate.edu).

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