September 6, 2022

Updated: Tuesday, September 6 at 3:00 PM ET

On September 2 at 12:49 PM PT, the Mill Fire broke out in the City of Weed in Siskiyou County, California. The cause of the fire is under investigation.

A general view of burnt and burning structures as the Mill Fire burns near Weed, California, U.S., September 2, 2022. Source: REUTERS/Fred Greaves

So far, the Mill Fire has burned across 4,263 acres. The fire has resulted in 117 destroyed structures, 26 damaged structures, 3 injuries, and 2 fatalities.

CrisisReady’s report on the fire, which was updated on September 4, 2022 at 16:00, provides information on the baseline vulnerabilities of the affected communities and insights on population movement dynamics as the emergency unfolds.

Population vulnerabilities of the communities affected by the Mill Fire.
Changes in population densities in the communities affected by the fire.

The most populous counties affected by the fire are Siskiyou CountyTrinity County, and Shasta County, with pre-crisis populations of 6,145, 1,360, and 31,816 respectively.

  • The population density of Siskiyou County has increased 13%
  • The population density of Trinity County has increased 5%
  • and the population of Shasta County has decreased 3%.

Areas with the most significant increase in population densities are:

  • Trinity Center (+140%)
    Baseline Population: 46; Crisis Population: 111
  • Dunsmuir (+33%)
    Baseline Population: 56; Crisis Population: 75
  • McCloud (+31%)
    Baseline Population: 143; Crisis Population: 187

Areas with the most significant decrease in population densities are:

  • Lake Shastina (-73%)
    Baseline Population: 179; Crisis Population: 48
  • Weed (-39%)
    Baseline Population: 157; Crisis Population: 96

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