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Lewis & Clark National Historic Trail Corps of Discovery II traveling exhibit tents showing images of American Indian tribes that Lewis and Clark met on their journey.
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Lewis & Clark National Historic Trail
Environmental Factors
 
scenic view of mountains looking west from Rt. 275 between Three Forks and Helena, near Townsend, Montana

NPS JH-Anderson

Looking west from Montana Rt. 275 between Three Forks and Helena, near Townsend, Montana.

Many environmental factors exist along the Lewis and Clark National Historic Trail. Everything from non-native species to untimely releases of water from dams, to the loss of habitats, can have significant impacts to this historic corridor.




Learn about some of these factors by visiting sites along the trail highlighted in the right-hand column.
aerial view of James River Island on the Missouri River
Aerial view of James River Islands on the Missouri
Missouri National Recreational River presents factors that threaten the river's ecology and beauty.
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springtime melts cause flooding of Knife River in Washburn, ND
Results of springtime melt on Knife River
Flooding of the Knife River threatens archeological sites.
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Rolling hills from Nez Perce visitor's center at dusk
Rolling hills from Nez Perce visitor's center
Since the arrival of man, the vegetation communities of the Plateau have experienced change.
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a river otter in a shallow pool of water
River otters need good water quality to survive
A Water Quality Baseline Inventory is used by scientists and researchers.
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Last Updated: August 20, 2010 at 09:51 MST