A-Rock Fire

Wildfire in Mariposa County, August 1990

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Printed October 28, 2026 from www.firezones.info/fire/4478/a-rock-fire-1990

Key facts

Started August 7, 1990
Contained Not recorded
Burned 17,758 acres
5th largest fire of 1990
Cause Lightning
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Where it burned

County

  1. Mariposa County 17,758 acres

Communities

  1. El Portal 422 acres
  2. Foresta 237 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.

The same land, other fires

Burned before

  1. 1909 Unnamed fire 14,413 acres in total 7,297 acres shared
  2. 1920 Unnamed fire 7,657 acres in total 5,316 acres shared
  3. 1921 Unnamed fire 1,834 acres in total 957 acres shared
  4. 1921 Unnamed fire 840 acres in total 829 acres shared
  5. 1922 Unnamed fire 528 acres in total 505 acres shared
  6. 1926 Unnamed fire 3,255 acres in total 3,176 acres shared
  7. 1927 Unnamed fire 11,854 acres in total 5,929 acres shared
  8. 1931 Unnamed fire 3,857 acres in total 2,208 acres shared
  9. 1936 Unnamed fire 4,925 acres in total 4,770 acres shared
  10. 1936 Unnamed fire 1,480 acres in total 782 acres shared
  11. 1936 Unnamed fire 1,480 acres in total 782 acres shared
  12. 1944 Unnamed fire 659 acres in total 594 acres shared
  13. 1945 Unnamed fire 998 acres in total 887 acres shared
  14. 1968 Eagle Fire Cause: Arson 537 acres shared
  15. 1968 Canyon Fire 1,690 acres in total · Cause: Miscellaneous 1,609 acres shared

Burned again

  1. 2003 Woodlot Fire 481 acres in total · Cause: Arson 475 acres shared
  2. 2009 Big Meadow Fire 7,553 acres in total · Cause: Escaped prescribed burn 3,888 acres shared
  3. 2011 Motor Fire 5,230 acres in total · Cause: Equipment use 3,269 acres shared
  4. 2014 El Portal Fire 4,745 acres in total · Cause: Campfire 4,654 acres shared
  5. 2018 Ferguson Fire 96,831 acres in total · Cause: Miscellaneous 3,113 acres shared

And 28 more fires that burned less of the same land. Acres are the land each fire shares with the A-Rock 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