Three events between 1978 and 1988 precipitated a major fire use policy review in 1989: the Ouzel fire in Rocky Mountain National Park, the Yellowstone fires of 1988 in and around Yellowstone National Park, and the Canyon Creek fire in the Bob Marshall Wilderness on the Lewis and Clark National Forest. In all three cases, monitored fires burned until they threatened developed areas. While none of the Yellowstone fires of 1988 were caused by controlled burns, later investigations proved the fire use policy was appropriate, though needing strengthening and improvement.