Service Description: Basin polygons developed as part of the debris flow emergency assessment for State-BAER in 2026. The USGS models post-fire debris flow hazards using soil burn severity and terrain data (King and others, 2025). The results are available on a USGS dashboard and used in our assessments. The model outputs debris flow probability, volume, and combined relative hazard for each hydrologic basin. Our assessment focuses on basins and stream segments with moderate to high combined relative hazard. The USGS model is based on a design storm event with a 15-minute peak rainfall intensity of 24 mm/hr. The model does not consider the effect of rain-on-snow or rapid snowmelt, which can also produce debris flows and flash floods. If you need assistance accessing or analyzing the USGS debris flow hazard assessment, please contact Nancy Calhoun (Nancy.Calhoun@dnr.wa.gov) and we can provide support.
Service ItemId: ec379c19831a4c61b4317a4a5f97d6cc
Has Versioned Data: false
Max Record Count: 2000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: False
Supports Shared Templates: True
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Copyright Text:
Spatial Reference: 4326 (4326)
Initial Extent:
XMin: -119.630653498321
YMin: 48.3657916137474
XMax: -119.579213867486
YMax: 48.410661376879
Spatial Reference: 4326 (4326)
Full Extent:
XMin: -119.946373381727
YMin: 47.669487619571
XMax: -117.228613301727
YMax: 48.9741074038586
Spatial Reference: 4326 (4326)
Units: esriDecimalDegrees
Child Resources:
Info
SharedTemplates
Supported Operations:
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