Who regulates forest roads?

It turns out that a huge amount of economic activity depends on whether the Environmental Protection Agency gets to regulate roads through forests, or not. At the behest of an environmental group, a panel of the 9th Circuit has overturned 35 years of established practice. The result could have massive economic consequences, to no obvious benefit other than the expansion of the EPA. Whether or not the decision survives on appeal, one is forced to wonder whether forestry companies will invest with confidence until the matter is resolved.