South Fork Complex Incident Resource Page

South Fork Complex

Includes the 3-9, Sulfur, Pellitreau, and Pilot Fires

Page/Links Last Updated: August 28, 2023

Information per InciWeb
Start Date: August 17, 2023
Initial Location: Northwest of Hyampom
Initial Latitude/Longitude: 40.638333, -123.551667

Latitude / Longitude Used: 40.638333, -123.551667

10 Miles Radius Zip Codes: 96046

10 Miles Radius Towns/Cities: Hyampom

20 Miles Radius Zip Codes: 96046,95527,95563,95550,95526,95549

20 Miles Radius Towns/Cities: Hyampom, Burnt Ranch, Salyer, Korbel, Bridgeville, Kneeland

50 Miles RadiusZip Codes: 96046,95527,95563,95550,95526,95549,95552,96010,95573,95528,96041,95514,95525,95569,95565,95524,95547,95521,95503,96048,95571,95502,95540,95595,95554,95518,96093,95534,95511,95559,95562,95519,95501,95553,95537,95564,96024,95545,95551,95536,96076,95560,95542,96052,95546,95558,95570,95556,96047

Zip Code & Town/City information pulled from FreeMapTools – Find ZIP Codes Inside a Radius

Mile radius size reference points: 5 mile radius covers about 78 sq miles, 10 mile radius covers about 314 sq miles, 15 mile radius covers about 707 sq miles, 20 mile radius covers about 1,257 sq miles, 25 mile radius covers about 1,963 sq miles, 30 mile radius covers about 2,827 sq miles, and 50 mile radius covers about 7,854 sq miles.

Acreage size reference points: 1 football field = about 1.3 acres; 640 acres = 1 sq mile;
12,800 acres = 20 sq miles; 32,000 acres = 50 sq miles; 96,000 acres = 150 sq miles; 320,000 acres = 500 sq miles; 480,000 acres = 750 sq mile.

Note about size reference points – fires rarely burn in nice even circles, therefore these reference points are general guides and the shape of the fire perimeter must be taken into account (e.g. a fire burn area may be significantly less than the 1,257 sq miles covered by a 20 mile radius yet extend beyond the 20 mile radius because the burn area is long but narrow).


Average Number of Persons per Household:
Humboldt County: 2.48         Trinity County: 2.83          State average: 2.92

Humboldt County Percent of Persons:
Under 5 Years: 4.7%      Under 18 Years: 18.5%     Over 65 Years: 20.0%

Trinity County Percent of Persons:
Under 5 Years: 4.1%      Under 18 Years: 17.4%     Over 65 Years: 30.6%

Owner-occupied housing unit rate:
Humboldt County: 57.6%       Humboldt County: 70.3%        State average: 55.5%

Data from US Census Bureau
Note – unless otherwise noted, these are county demographics and local conditions may differ some.

Power & Gas Outage List for Humboldt County and Trinity County – This site provides aggregates live power outage data, though may not include some of the smaller local utilities.

PG&E Outage Map

Trinity Public Utility District Outage Map


CalTrans Quick Map

Caltrans Check Current Highway Conditions

Caltrans District 1 Updates – covers the counties of Del Norte, Humboldt, Lake, and Mendocino (feed also viewable in social media section below)

Caltrans District 2 Updates – covers the counties of Shasta, Siskiyou, Trinity, Tehama, Modoc, Lassen, Plumas, and parts of Butte and Sierra (feed also viewable in social media section below)

Caltrans Truck Network Map for District 1

Caltrans Truck Network Map for District 2

Caltrans CA Road System – Functional Classification

Humboldt County Road Condition Updates


FAA No Fly Zones – provides a list of no fly / restricted flight areas

Flight Radar 24 – here you can see flight paths of aviation fire fighting resources including both planes and helicopters.

Air Quality & Smoke Links


Wind Map

Temperature Map

National Weather Service Watches, Warnings, and Advisories

Warning – A warning is issued when a hazardous weather or hydrologic event is occurring, is imminent, or has a very high probability of occurring. A warning is used for conditions posing a threat to life or property.

Advisory – Highlights special weather conditions that are less serious than a warning. They are for events that may cause significant inconvenience, and if caution is not exercised, it could lead to situations that may threaten life and/or property.

Watch – A watch is used when the risk of a hazardous weather or hydrologic event has increased significantly, but its occurrence, location, and/or timing is still uncertain. It is intended to provide enough lead time so that those who need to set their plans in motion can do so.

These definitions are from the National Weather Service Glossary.

Regional Fuel Conditions

Burning Index

Burning Index

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Burning Index is a measure of fire intensity. It combines the Spread Component (a rating of the forward rate of spread of a head fire) and Energy Release Component (estimated potential available energy released per unit area in the flaming zone of a fire) to relate to the contribution of fire behavior to the effort of containing a fire.

100-Hour Fuel Moisture

100 Hour Fuel Moisture

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100-Hour Fuel Moisture is computed from 24–hour average conditions composed of day length, hours of rain, and daily temperature/humidity ranges. It can also be used as a very rough estimate of the average moisture content of the forest floor from three-fourths inch to four inches below the surface.

County Links & Social Media Feeds