Survey Identified Low Mudslide Risk in Old Trails Fire Area

Geologists found the fire intensity was too low to severely disturb soil layers in the affected Spokane regions.

Updated on Sept. 30, 2026 in Natural Disasters

A scorched pine tree stands on a steep rocky hillside in eastern Washington, highlighting post-fire landscape conditions. — The Washington Geological Survey has determined that the Old Trails fire burn area near Spokane poses a low risk for mudslides due to the low fire intensity. AI Illustration. Upload story photo >

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The Washington Geological Survey has released a report indicating a low risk of mudslides within the Old Trails fire burn area. Fire intensity remained low enough that soil layers were not severely disturbed.

Why it matters

Understanding post-fire geological risks is essential for public safety, as the survey helps identify specific areas vulnerable to secondary hazards like flooding and erosion.

Geologists determined the Old Trails fire moved too quickly to cause severe soil disturbance. Spokane has also installed storm drain filters to mitigate potential water runoff.

The players

Washington Geological Survey

This state agency evaluates geological hazards, including landslide and erosion risks, to inform public safety and land management decisions.

The details

While the overall mudslide risk is low, geologists have warned that homes on steep, southwest-facing slopes remain vulnerable to erosion and rockfall. Pedestrian trails in Riverside State Park also face an elevated risk of flooding.

August 1, 2026: The Old Trails fire occurred in Spokane.
August 2026: Geologists mapped burn area hazards within one week of the fire.
September 2026: The Washington Geological Survey issued its risk report.

Seasonal Patterns

This study follows the standard procedures set by the Washington Geological Survey's hazard mapping protocols. The findings provide a localized update to historical burn severity assessments for the region.

Residents near steep, southwest-facing slopes should monitor properties for signs of rockfall or erosion. Pedestrians are advised to exercise caution in Riverside State Park due to the elevated risk of flooding.

The takeaway

While the immediate threat of mudslides remains low, secondary hazards like rockfall and flooding require continued vigilance from local residents. Proper storm drainage management continues to be a priority for the city to mitigate runoff impacts.