Wildland-urban interface housing growth during the 1990s in California, Oregon, and Washington

In the present study, we examine housing growth in California, Oregon, and Washington in the wildland-urban interface (WUI), the area where homes and other structures abut or intermingle with wildland vegetation. We combine housing density information from the 1990 and 2000 USA censuses with land cover information from the 1992/93 National Land Cover Dataset to demarcate the location and extent of the WUI and its growth, both in terms of area and number of housing units during the 1990s. We overlay the WUI with coarse-scale fire regime condition class information to evaluate implications for wildland fire management. During the 1990s, WUI area in the three-state region increased by 5218 km 2 (10.9%) to nearly 53 000 km 2 and the number of housing units in the WUI increased over 1 million units (17.6%) and in 2000 encompassed 6.9 million units, 43% of all housing in the region. Over a million new homes were constructed in the WUI, comprising 61% of the new homes constructed in the region. By 2000, there was far more intermix WUI (75% of the WUI area and 64% of the WUI housing units) than interface WUI. Expansion of the WUI accounted for only 13% of WUI housing unit growth and WUI that existed in 1990 encompassed 98% of WUI housing units in 2000. In 2000, there were nearly 1.5 million WUI housing units in areas with 0-35-year fire return intervals and 3.4 million in areas with 35-100+ year fire return intervals. In both these fire regimes, the majority of WUI housing units (66% and 90% respectively) are in areas with a current condition outside the historic range of variability. Housing growth patterns in this three-state region are exacerbating wildland fire problems in the WUI. Any long-term solution to wildland fire issues in the western United States will have to address housing growth patterns. Using a consistent, nationally applicable assessment protocol, the present study reveals the vast extent of WUI in the west coast states and its growth in the 1990s, and provides a foundation for consistent monitoring efforts.

[1]  Volker C. Radeloff,et al.  Rural and Suburban Sprawl in the U.S. Midwest from 1940 to 2000 and Its Relation to Forest Fragmentation , 2005 .

[2]  Carol Miller,et al.  A model of surface fire, climate and forest pattern in the Sierra Nevada, California , 1999 .

[3]  J. Fried,et al.  Homeowner Perspectives on Fire Hazard, Responsibility, and Management Strategies at the Wildland-Urban Interface , 2000 .

[4]  S. Ventura,et al.  ENVIRONMENTAL AND SOCIAL FACTORS INFLUENCING WILDFIRES IN THE UPPER MIDWEST, UNITED STATES , 2001 .

[5]  N. Stephenson.  REFERENCE CONDITIONS FOR GIANT SEQUOIA FOREST RESTORATION: STRUCTURE, PROCESS, AND PRECISION , 1999 .

[6]  Hong S. He,et al.  Altered Fire Regimes Affect Landscape Patterns of Plant Succession in the Foothills and Mountains of Southern California , 2005, Ecosystems.

[7]  J. Brown,et al.  Fire regimes and their relevance to ecosystem management , 1995 .

[8]  Jack D. Cohen.  Reducing the Wildland Fire Threat to Homes: Where and How Much? 1 , 1999 .

[9]  David L. Bunnell,et al.  Fire and land management planning and implementation across multiple scales , 2001 .

[10]  R. B. Hammer,et al.  Human demographic trends and landscape level forest management in the northwest Wisconsin Pine Barrens , 2001 .

[11]  Volker C. Radeloff,et al.  Characterizing dynamic spatial and temporal residential density patterns from 1940-1990 across the North Central United States , 2004 .

[12]  J. Fried,et al.  Chaparral in southern and central coastal California in the mid-1990s: area, ownership, condition, and change. , 2004 .

[13]  J. Michaelsen,et al.  Variations in a regional fire regime related to vegetation type in San Diego County, California (USA) , 2004, Landscape Ecology.

[14]  A. Taylor,et al.  Climatic influences on fire regimes in the northern Sierra Nevada mountains, Lake Tahoe Basin, Nevada, USA , 2005 .

[15]  Ddt Chen,et al.  Once There Were Greenfields: How Urban Sprawl is Undermining America's Environment, Economy, and Social Fabric , 1999 .

[16]  T. Daniels.  When City and Country Collide: Managing Growth In The Metropolitan Fringe , 1998 .

[17]  Susan I. Stewart,et al.  Defining the Wildland-Urban Interface , 2007 .

[18]  James P. Menakis,et al.  Development of coarse-scale spatial data for wildland fire and fuel management , 2002 .

[19]  J. Keith Gilless,et al.  Assessing the Benefits of Reducing Fire Risk in the Wildland- Urban Interface: A Contingent Valuation Approach , 1999 .

[21]  Richard D. Stratton,et al.  Assessing the Effectiveness of Landscape Fuel Treatments on Fire Growth and Behavior , 2004, Journal of Forestry.

[22]  J. Agee.  Fire Ecology of Pacific Northwest Forests , 1993 .

[23]  A. Taylor,et al.  Fire and persistence of montane chaparral in mixed conifer forest landscapes in the northern Sierra Nevada, Lake Tahoe Basin, California, USA1 , 2005 .

[24]  D. Urban,et al.  Interactions between forest heterogeneity and surface fire regimes in the southern Sierra Nevada , 1999 .

[25]  Susan I. Stewart,et al.  The wildland-urban interface in the United States based on 125 million building locations. , 2005, Ecological applications : a publication of the Ecological Society of America.

[26]  J. Vogelmann,et al.  Regional Land Cover Characterization Using Landsat Thematic Mapper Data and Ancillary Data Sources , 1998 .