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Inactive

Tributary

Riverside, CA · Undetermined

This fire is no longer active. It burned 4 acres in Riverside before dropping off the national incident feed.

0%Inactive

4

Acres Burned

81

Days Burning

Aug 21, 2026

Discovered

3w ago

Last Update

Growth

Grew 1 acres in the last day
Aug 21 / 1 acresOct 17 / 4 acres

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Public Lands Nearby

12 public land units within 75 miles

Cucamonga Wilderness

Go

Wilderness / CA

19.6 mi

N

Sheep Mountain Wilderness

Go

Wilderness / CA

25.8 mi

NW

San Mateo Canyon Wilderness

Go

Wilderness / CA

29.7 mi

S

San Gabriel Wilderness

Check first

Wilderness / CA

32 mi

NW

Seal Beach National Wildlife Refuge

Go

Wildlife Refuge / CA

34 mi

SW

San Bernardino National Forest

Go

National Forest / CA

34.8 mi

E

Pleasant View Ridge Wilderness

Check first

Wilderness / CA

35.7 mi

NW

San Gabriel Mountains National Monument

Check first

Monument / CA

35.9 mi

NW

San Gorgonio Wilderness

Go

Wilderness / CA

42.3 mi

E

Angeles National Forest

Check first

National Forest / CA

47.1 mi

NW

Agua Tibia Wilderness Area

Go

Wilderness / CA

47.5 mi

SE

South Fork San Jacinto Wilderness

Check first

Wilderness / CA

48.7 mi

SE

Situation Updates

Changes read from NIFC interagency perimeter data

TRIBUTARY update: 3 acres

Perimeter data
Aug 21

Per interagency perimeter data, the TRIBUTARY grew 2 acres to 3.

IRWIN

TRIBUTARY mapped at 1 acres

Perimeter data
Aug 21

Interagency perimeter data shows the TRIBUTARY at 1 acres.

IRWIN

Timeline

Aug 21Now

81 days since discovery

Other Fires in California

7 other active fires

California wildfire map: every fire burning in the state and the past year's fires. Planning a trip? California national parks guide.

Data Sources

Fire data from NIFC Wildland Fire Interagency Geospatial Services (WFIGS) via IRWIN. Satellite hotspots from NASA FIRMS VIIRS. Situation updates are either posted by the incident management team on InciWeb or read by us from WFIGS perimeter data, and each one says which. Air quality data from EPA AirNow. Public lands boundaries from USGS PAD-US 4.0.

IRWIN ID: c616dbd5-8f2e-416c-b667-7b86b04a0f49

Important

More Than Just Parks aggregates third-party data from EPA AirNow, NOAA, NASA FIRMS, and NIFC/WFIGS. Readings can be delayed, estimated, incomplete, or wrong, and conditions on the ground change quickly. This tool is for general information only and is not a substitute for official air quality alerts, fire and evacuation orders, land manager closures, or emergency services. Verify with the managing agency and local authorities before making any travel, health, or safety decision. We make no warranty as to accuracy and accept no liability for decisions made using this information. This is not an emergency or evacuation tool. If you are near a fire, follow official evacuation orders and call 911. Terms of Service.