Upriver Fire Cause Remains Undetermined Due to Insufficient Evidence, Report States

Spokane, WA, October 6, 2026 —

SPOKANE, WA – The cause of the Upriver Fire, which occurred in Spokane, has been officially determined as ‘undetermined,’ according to a recent report. Investigators cited a lack of sufficient evidence as the primary reason for this conclusion.

The Upriver Fire prompted investigations into its origin, a standard procedure for significant incidents. However, the findings indicate that the available evidence did not allow for a definitive determination of how the fire started.

Official reports often detail the findings of fire investigations, including contributing factors, ignition sources, and the sequence of events leading to a fire. In cases where evidence is insufficient, the cause is classified as undetermined. This classification signifies that while a fire occurred, the investigative team could not conclusively identify the specific event or circumstance that initiated it.

Further details regarding the timeline of the fire, the extent of the damage, or specific locations within Spokane that were affected were not provided in the summary of the report. The report’s focus remained on the outcome of the cause determination process.

Without additional information detailing the investigative process or the evidence collected, it is not possible to ascertain what specific challenges investigators faced in reaching a conclusion. The classification of ‘undetermined’ typically means that all potential causes were considered, but none could be substantiated with the evidence gathered.

The Upriver Fire incident is now closed from an investigative standpoint regarding its cause, with the findings documented as ‘undetermined’ due to the limitations of the available evidence.

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