Water, Rivers & Topography
suggested grade levels: 9-12
view Idaho achievement standards for this lesson
Answer these questions below:
1. Rivers and drainages:
a. Using the Eastern Idaho and Southeastern Idaho drainage and mountain range maps, inspect the courses of the major rivers.
b. Which direction do most of the rivers south of the Snake River flow until they reach the Snake River? What about the Portneuf and the Bear Rivers? Which way are they flowing? What caused this unusual drainage pattern?
c. What rivers north of the Snake River flow south and join with it, and which do not? If they do not flow into the Snake River where do they flow?
2. The Yellowstone
a. The Hot Spot is now north and east of the Snake River Plain and forms a topographic high. Rivers flow away from Yellowstone. Now imagine that the Yellowstone Hot Spot is near Pocatello. How would the hypothetical presence of a topographic high like Yellowstone at Pocatello affect the rivers that now flow into the Snake River near Pocatello? Visit drainage development to find the answers.
Landscaping". The landscape near Pocatello was dramatically modified in just
a few weeks fifteen thousand years ago. Visit the Lake Bonneville Flood to answer
a. Where did the water come from?
b. Where did it go?
c. What major changes to the landscape were caused by the Bonneville flood?
d. Could we have another Bonneville flood? What conditions would have to exist for this to occur?
Hydrology: Hydrology Topics