Feed checks and source-record updates do not necessarily mean fire conditions changed. Figures below reflect the last recorded incident report.
The last recorded incident change is more than 14 days old or undated. Historical fire behavior and summaries below are not confirmation of current conditions.
Automated summary generated: Oct 9, 2026 19:26 UTC. It may lag behind the report and is not an official alert.
The RIOSA wildfire was discovered on 2026-10-07 at 20:11:52 in Placer County, California, at latitude 38.984885126264 and longitude -121.32924319582. Initial reports from the National Interagency Fire Center (NIFC) indicated the fire had burned 25 acres by 21:00:03 on the same day, expanding to 46 acres by 22:20:05. The cause remains undetermined, and no jurisdictional agency has been identified. Current fire behavior and containment status are not reported, and no personnel or cost estimates are available. The incident was last reported by NIFC at 18:49:34 on 2026-10-09, with no further updates on growth or containment.
Good air quality at the reporting station. AQI does not assess fire danger, road access or evacuation status.
Reporting area: Lincoln. Source: AirNow.gov (EPA).
Observed: 2026-10-23 18:00:00 UTC Β· Site: Lincoln.
Any automated community or travel summary below may be outdated. It is not a live evacuation or road-closure notice.
Verify evacuation orders, closures and access with the responsible fire agency, county emergency management or sheriff. A containment percentage, feed status or AQI reading does not establish that an area is safe to enter.
NIFC fire information and official resources βIRWIN ID: {CDF80653-D313-4FBC-8B15-9D037B3B3240}
Discovered: Oct 7, 2026
Cause: Undetermined
Coordinates: 38.9849, -121.3292
Other wildfires no longer present in our filtered incident feed in CA.
The RIOSA Fire has burned 46 acres as of October 7, 2026.
Containment has not been officially reported for the RIOSA Fire.
The official cause has been listed as: Undetermined.
The RIOSA Fire is burning in Placer, CA.
The RIOSA Fire is no longer in our filtered incident feed. This alone does not confirm extinguishment.
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