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Sun, July 05

Fire Managers carry out two prescribed fires on Grand Canyon's North Rim
Smoke from fires expected to settle in Grand Canyon at night, rise back out during the day as temperatures rise

GRAND CANYON, Ariz. - National Park Service (NPS) and U.S. Forest Service (USFS) fire managers, working together as the North Zone Interagency Fire Management Program, have completed plans for the Range and Thompson Prescribed Fires on the North Rim of Grand Canyon National Park. Fire managers planned to start these prescribed fire treatments within the next four weeks as weather and fuel moisture conditions allow.

Prescribed fires play an important role in decreasing risks to life, resources and property. Fire managers carefully plan prescribed fires, initiating them only under environmental conditions that are favorable to assuring firefighter and visitor safety and to achieving the desired objectives. Objectives common to both prescribed fires include reducing accumulations of forest fuels, maintaining the natural role of fire in a fire-adapted ecosystem and protection of sensitive cultural resources.

Both fires were started using a combination of aerial and hand ignitions.

Range Prescribed Fire (Range Rx)

North Zone Interagency Fire Managers have completed ignitions on the Range prescribed fire (Rx) unit. Approximately 2,300 acres were treated. This prescribed fire has helped reduce the build-up of dead and down vegetation on the forest floor, reducing the risk of extreme fire behavior along Highway 67, the North Rim's primary egress route, and protecting and enhancing Mexican spotted owl habitat.

Fire managers began hand and aerial ignitions on the Thompson Rx unit Nov. 2. The Range Burn Unit was composed primarily of mixed conifer forest with spruce, fir, aspen, and ponderosa pine. The majority of the burn unit has not burned in recent years, resulting in a heavy build-up of dead and down fuels.

Thompson Prescribed Fire (Thompson Rx)

Fire managers began hand and aerial ignitions on the Thompson Rx unit Nov. 2. Approximately 2,000 acres are being treated to help create defensible space along the park boundary with the Kaibab National Forest and to aid in protecting threatened and endangered species habitat adjacent to the boundary, including Apache trout and Mexican spotted owl habitat. The Thompson Burn Unit is a narrow burn unit located along the northern boundary of the park between Highway 67 and the Arizona Trail on the west and the 2000 Outlet Fire history area on the east. This burn unit actually extends north of the park boundary to Forest Service road 610. As a result, the Thompson Rx will be managed jointly by the NPS and USFS.

This burn unit is approximately 2,000 acres in size and is composed primarily of ponderosa pine with spruce, fir, and aspen. The Thompson burn unit has not experienced recent fire, resulting in a significant build-up of large dead and down fuels.


Smoke from these fires will be most visible during ignition operations and will likely gradually diminish after ignitions are completed. It is expected that smoke will continue to be visible until a major rain or snow event occurs.

Smoke will be visible along Highway 67 and Highway 89A as well as from various locations on both the North and South Rims. During the day, smoke is expected to dissipate to the north and northeast. In the evenings, it is likely that smoke will settle into the canyon as temperatures cool, then rise slowly back out during the day as temperatures warm again. Evening smoke may also settle in the House Rock Valley, Marble Canyon and Page areas. Smoke impacts have the potential to be heavy in the inner canyon.

Fire management staff are working closely with the Arizona Department of Environmental Quality- Smoke Management Division to reduce and mitigate potential smoke impacts.

Like all prescribed fires, the plans for the Range and Thompson Prescribed Fires contain a set of parameters which define (among other things) the expected weather and fuel conditions under which the fire can be initiated. Prior to implementing the burns, fire managers will evaluate current conditions and will only ignite the fires if the prescribed conditions are within those parameters.

Information on these prescribed fires is available at, or from Grand Canyon Public Affairs Specialist Shannan Marcak at (928) 638-7958.

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