NIOSH Cedar Fire Report
CDF Cedar Fire Report
Novato FPD Investigation Analysis
Draft Standard Operating Procedures
Inaja Fire Tragedy
|1 This and other technical terms in this report are explained in a glossary on the last page.|
On the second day of the fire, the Forest Service had four fire fighting divisions led by experienced and qualified personnel from all parts of the California Region. Pine Hills Guard Station was fire headquarters. The flanks of the fire had been contained except for three hot sectors -- a hand line from Eagle Peak down to the San Diego River on the south; across San Diego Canyon from rim to rim on the north; and across Cedar Creek at the rear of the fire. The latter was considered of greatest concern due to the threat to more than 100 homes nearby.
During the day, Sunday, the fire in San Diego River Canyon was advancing slowly up the canyon against the wind with occasional flare-ups. Tongues of flame intermittently moved ahead and up small side ridges. Fire on and just below the east rim of the canyon was quartering into the wind with occasional flare-ups as it reached heavy fuels.
High winds made it impossible to use helicopters until 4:00 p.m. The night line boss scouted Division IV on the north side and east of the San Diego River at 4:30 p.m. (An aerial photo-map of this area is shown on page 3.) Because of the wind, he had to fly high. This situation, coupled with the smoke from the fire, made it impossible for him to get complete information as to control lines lost and progress of construction of other lines. The fire edge was relatively hot, burning into the wind on the west side and more slowly on the east side.
Fire weather throughout southern California in 1956 was unusually severe. It was climaxed by a prolonged period of Santa Ana wind conditions  extending from November 19 through the Inaja fire disaster on November 25. The area was having unprecedented drought. Rainfall had been well below normal for 4 years.
|2 Strong, dry winds from the desert area east of the coast mountains flowing down through the mountain passes and canyons to the sea.|
During the afternoon and evening of November 25, relative humidity in the vicinity of the fire was near 18 percent and the temperature was about 68°F. Gusty east and northeast winds averaging 15 or 20 miles per hour, but with some gust up to 40 miles, were observed at many places around the fire.
Brush consisting of chamise and sagebrush of medium density covered much of the disaster area. Moisture content of the brush approximated the lowest ever measured for these species, and is believed to be near the minimum possible.
The San Diego River bed was dry. The canyon walls are steep and rugged, with slopes as steep as 70 percent in many places. Rock outcroppings are common on both sides of the canyon. The distance from the rim to the river bed was about 3,500 feet in the disaster area.
The job to be done on the east side of the San Diego River Canyon (Division IV, Sector G) was to clear by tractor a fire trail through the brush along the rim of the canyon and to construct by hand a similar trail from the top of the canyon rim to the dry river bed on the canyon floor. These trails were to serve as control lines for burning back to the main fire.
The tractor-built trail running along the rim was completed by 11:00a.m. Some burning out to make the trail wider was started. The trail was patrolled by a 4-man crew, using a 280-gallon water tanker. Two attempts were made to start hand construction of the trail from the top of the rim to the canyon floor. In both cases the men were called back when it became evident that trail could not be completed before being flanked by the main fire. Later in the day a third line was started. By 2:00 p.m. the crew had cut about 600 feet of fire trail downward from the canyon rim. It was estimated that 3 more hours of work were needed to reach the bottom. At about 3:00 p.m. the division boss withdrew the men from the third line because fire conditions seemed to make the work there unsafe. The crew had completed nearly 1,100 feet of trail. The crew continued to patrol the tractor-built trail along the top rim of the canyon. Between 4:30 p.m. and 7:00 p.m. the fire quieted down. No flare-ups were observed during this period.
At the main camp the night shift division boss was instructed to build line and burn out. since there was little specific information on Sector G available at the main camp because of partial ineffectiveness of aerial reconnaissance, he was told to check with the day division boss for conditions on the ground.
The night shift arrived at the fire after dark, about 7:00 p.m. The day division boss briefed the night division boss on fire conditions and work done during the day. He emphasized that during the day the wind had been tricky and that difficulty had been experienced along the rim when burning-out operations were attempted. The night division boss discussed the conditions with his two sector bosses, and they agreed upon a plan of action. One sector boss and one crew boss with 20 inmates were to burn out along the tractor-built line on the canyon rim and down the hand line. Operations of this kind are normally carried out at night when winds subside and burning conditions are less hazardous.
The second sector boss with 3 crew bosses, the correctional officer, and 13 inmates was to complete the cutting and scrapping of the hand trail to the river. The two sector bosses synchronized their watches at 7:18 p.m. and agreed to have a radio check at 7:55 p.m.
The plan went into operation with men going down the hand line and the tanker crew on the rim laying a hose to help hold the burning-out fire. One length of hose broke and some water was lost in replacing it. The water in the tanker was used up by 8:00 p.m.
The brush cutters in the 13-man trail-building crew started work as soon as they reached the point where the day crew had stopped work. The scrapers waited a few minutes until the cutters got a short piece of trail cleared. The boss of these scrapers lined out his men and gave them instructions on the work they were to do. He then went back up the fire trail toward the canyon rim to check on the burning-out work as the sector boss had previously instructed him to do.
When the scraper crew boss go the top of a small 15-foot bluff on the trail, approximately 75 feet in a direct line from the canyon rim, he noticed a that the main fire was unexpectedly flaring up on a side ridge more than 1,000 feet below the men. Suddenly it made a short run toward the main ridge where the men were building trail. He called a warning to the men working on the fire trail below and told them to come out. One of the bosses below answered his warning.
The men stopped work and all started back up the trail at a normal pace. This was at about 7:45 p.m. The men farthest down the hill had approximately 1,100 feet to travel up the trail. Survivors reported that there was no panic. Some of the men wondered why they were being called out. Most of them kept their tools. One even picked up a shovel and canteen abandoned by another.
The fire below suddenly gathered momentum and the crew boss on the top of the small bluff saw that it was now a real threat to the men below. This happened about 2 minutes after the first warning and he again yelled to the men, telling them to hurry up. Most of the men now dropped their tools and began to go faster.
Two of the men stationed on the upper part of the line escaped before the fire reached the rim. Two others who also had been working on the upper part of the line stopped at a small open spot just below the rock bluff on the cleared line. Others pressed on up to them from below. Within a minute or two, 5 men who had been working lower on the line reached the 2 men waiting in the open spot. They were slightly ahead of the remaining 9 men. By this time the fire had outrun them to the right and had crossed the cleared trail above. These 5 men turned off to the left, climbed and struggled up the 15-foot rock bluff, and raced the remaining 75 feet to safety at 8:05 p.m. They reported later that on this last stretch the fire was only 10 feet behind them.
The eleven victims were cut off while still below the small bluff, presumably by an instantaneous “flash-over” of a large area of fire. This sudden expansion of the fire front was testified to by the survivors and other nearby observers. In addition, two fire bosses on the opposite side of the main San Diego Canyon observed the action of the fire when it made its fatal run. They reported that it ran up the ravine beside the ridge where the men were working and across the fire trail near the top. At about the time the fire got to the rim there was a sudden “flash-over” to the left, which the observers said simultaneously ignited a large area, perhaps 40 acres. This explosive “flash-over” enveloped the 11 victims just below the small bluff. It apparently was caused by ignition of gases forced up the ravine by the extremely rapid run of the fire.
All victims were found in an area with a radius of 45 feet and the lowermost one was only 300 feet from the tractor-built line at the top of the canyon rim. The fire barely crossed this line in only a few places, where it was quickly put out. Of the men that escaped, two had been working at the very lowest part of the trail. Two who had been working closest to the rim did not escape.
Several of the fire fighters, including the forest officers who lost their lives, stayed with the crew until the last, helping and urging others out even though they might otherwise have had an opportunity to escape. One of those who escaped credited a fellow crew man with saving his life when he became exhausted while climbing over the rock bluff.
Before being controlled at 6:00 p.m., Wednesday, November 28, the fire burned 43,611 acres within the Cleveland National Forest and adjoining land protected by the State. The area burned had a 90 mile perimeter. At least 5 homes were destroyed. More than 2,000 men fought the fire, 1,300 under Forest Service supervision. These included 500 Indians (local and Southwestern Region), about 500 Navy personnel, 200 inmates from San Diego County and State Honor Camps, and other organized crews. These men plus 3 helicopters, 4 air tanker planes, 2 scouting planes, 27 bulldozers, and a fleet of 90 stake, tank, and pickup trucks, formed one of the greatest arrays of men and equipment ever assembled to fight a forest fire in San Diego County.
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