ow a project to divert water from the west slope of the Rockies beneath Rocky Mountain National Park to the dry plains on the eastern side, making a new defense of Yellowstone necessary. In February 1937, the Idaho
legislature petitioned Congress to allow a dam at Yellowstone Lake and tunnels (such as those being drilled under Rocky
Mountain National Park) to transport water from Yellowstone into the Snake River drainage, another plan that the NPA and others succeeded in stopping. More recently, these groups have set out to stop another threat to Yellowstone, the exploitation of groundwater in and outside of Yellowstone. Park waters throughout the national park system are in trouble. This can be seen in the 1993 publication Park Waters in Peril, which describes threats to 12 parks, including Yellowstone. The report also recommends solutions, such as strengthening the Clean Water Act. This is only one of the threats that have been seen as creating a challenge for the National Park Service and other groups:
Today, commercial development on lands adjac
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