Detwiler Fire

Wildfire in Mariposa County, July 2017

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Printed October 28, 2026 from www.firezones.info/fire/7642/detwiler-fire-2017

Key facts

Started July 16, 2017
Contained August 31, 2017, after 46 days
Burned 81,826 acres
4th largest fire of 2017 and 70th largest in California's records
Cause Miscellaneous
Buildings 134 destroyed, 21 damaged
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Where it burned

County

  1. Mariposa County 81,819 acres

Communities

  1. Bear Valley 1,561 acres
  2. Catheys Valley 768 acres
  3. Mariposa 220 acres
  4. Mt. Bullion 120 acres

Acres are the land the fire burned in each county and community, and places where it burned less than an acre are not listed. Communities are cities, towns and the unincorporated places the Census Bureau names, so land outside any of them is counted only in its county.

Buildings damaged

  1. Destroyed Over 50% damaged 134
  2. Major damage 25 to 50% damaged 2
  3. Minor damage 10 to 25% damaged 5
  4. Affected Up to 10% damaged 14

Buildings CAL FIRE inspected after the fire, by how badly each was damaged. Inspectors record homes, businesses and outbuildings within 100 meters of the fire, and cannot always reach every one, so the counts can differ slightly from other reports.

The same land, other fires

Burned before

  1. 1924 Unnamed fire 37,135 acres in total 7,396 acres shared
  2. 1934 Unnamed fire 4,638 acres in total 2,632 acres shared
  3. 1952 Cathay Valley Mt. Fire 808 acres in total 746 acres shared
  4. 1953 Bullis Fire 2,590 acres shared
  5. 1954 White Gulch Fire 6,641 acres in total 5,283 acres shared
  6. 1958 Crown Lead Fire 943 acres in total 933 acres shared
  7. 1958 Guisto Fire 817 acres shared
  8. 1970 Williams Fire 1,690 acres shared
  9. 1983 Old Toll Fire 521 acres shared
  10. 1983 Lightning #7 Fire 705 acres in total 691 acres shared
  11. 1994 Hunter Fire 668 acres shared
  12. 1996 Cotton Fire 826 acres in total 800 acres shared
  13. 2000 Hunter Fire 8,206 acres in total · Cause: Equipment use 7,461 acres shared
  14. 2003 Hunter Fire Cause: Equipment use 475 acres shared
  15. 2005 Unnamed fire 543 acres shared
  16. 2008 Telegraph Fire 34,084 acres in total · Cause: Miscellaneous 5,203 acres shared
  17. 2012 Gaines Fire 1,662 acres in total · Cause: Power lines 1,144 acres shared

Burned again

  1. 2019 Gaines Fire 979 acres in total 924 acres shared
  2. 2022 Agua Fire Cause: Vehicle 397 acres shared
  3. 2024 Pedro Fire 3,819 acres in total · Cause: Playing with fire 482 acres shared

And 22 more fires that burned less of the same land. Acres are the land each fire shares with the Detwiler Fire, and fires that shared less than an acre are not counted. Some older or smaller fires may be missing, and a fire perimeter can include unburned patches. How to read fire history

Sources

Fire history
CAL FIRE Fire and Resource Assessment Program
Published 28 July 2026
Building damage
CAL FIRE Damage Inspection
Updated 19 October 2026

This site is independent and not affiliated with CAL FIRE or the CPUC, so for an official determination, check with the agency or your city or county. How we read the data