Environments along the Lewis and Clark Trail Philip J. and Carol A. Gersmehl New York Center for Geographic Learning.

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Presentation transcript:

Environments along the Lewis and Clark Trail Philip J. and Carol A. Gersmehl New York Center for Geographic Learning

Most rivers start as tiny creeks near high mountains.

Near their sources, streams are usually cold and rocky. Not good for boats!

Halfway to the ocean, streams are larger, but most of them are still shallow and rocky. Not good for boats! This is a key part of the story of Lewis and Clark.

The Louisiana Purchase nearly doubled the area of the United States

Lewis and Clark’s plan was to use boats to go up the Missouri River, cross the mountains, and then go down another big river to the Pacific Ocean.

What they did not know was that they would also be going from a rainy area, through a dry area, across snowy mountains, through another dry area, and to a very rainy area.

They would be going over some mountains that are much higher than anything they saw in the East.

All of these maps come from Carol’s GIS package. You can use as many as you choose to.

The maps all have Lewis and Clark’s route printed on top of other information.

Imagine that you were going on a one-week hike through this area.

The question is simple: What do you want in your pack?

There is a difference: We were planning a one-week trip in one environment we knew quite well. Lewis and Clark were planning a year in many different environments they did not know.

What would you take to go all the way across the country? Axe Coat Rifle Saw Nails Flint Mosquito Net Medicine Tent Gifts Bullets Compass Telescope Boots Raincoat Candy Map Pen, Ink Wagon ? Boat ? Wagon ? Boat ? Oars Horses Wheels Grease Pails Forge Rope Chain Locks Cup Spoon Knife Caulk

Let’s look at the rivers first, because Lewis and Clark planned to use rivers as “highways.” planned to use rivers as “highways.”

In Missouri... the Missouri River is wide and surrounded by forest.

In South Dakota (before dams) the Missouri River is shallow and filled with sandbars.

In North Dakota (before dams) the Missouri River is shallow, a home for waterbirds.

In central Montana the Missouri River is small, surrounded by cliffs.

In western Montana the Missouri River starts as a small creek.

In Idaho, there is no river on the Continental Divide.

Farther west, there are some creeks flowing downhill to the west.

Still farther west, the creeks join to make a fairly large river. It’s called the Clark Fork. Guess who gave it that name!

In the middle of Oregon, the Columbia River flows through a rocky desert.

Modern dams make this river much wider and slower than it was.

Near the ocean, the river is wide and very deep.

The Pacific shoreline is a geologically active mix of rocks and sand.

Repeat the journey, looking at the land.

In Missouri, the land is covered by fast-growing, tall trees.

People use the trees to make houses, tools, wagons, many other things.

In South Dakota, the trees are short and grow only in moist places.

Away from the rivers, the Dakotas are mostly a natural grassland.

Animals are large but rather hard to hunt (they see you from far away).

In eastern Montana, there are not enough plants to protect the ground.

In western Montana, the high mountains are covered with trees.

In eastern Oregon, the hard lava rock makes a thin, dry soil.

The soil is sometimes so thin that people have to make rock cribs for fenceposts.

In central Oregon, the river cuts through the high Cascade Mountains.

Waterfalls are common where side creeks join the main river.

In western Oregon, the trees grow very tall, straight, and close together.

This is a reproduction of the fort-and-winter-camp that Lewis and Clark made.

Close to the ocean, the salt water makes it hard for many plants to grow.

The beaches near the ocean are likely to be foggy and cool rather than sunny and warm.

What Lewis and Clark did not see did not see (fortunately for them!)

They did not see hundreds of miles of forest, rocks, and swamps (like north-central Canada).

They did not see mountains too cold for trees (like the Beartooth Range in Southwest Montana).

They did not see mountains too steep to climb (like the Grand Tetons in Wyoming).

They did not see steep granite domes (like Yosemite Park in California).

They did not see miles of volcanic lava (like the Cascades in Oregon).

They did not see wide valleys full of salty soil (like Death Valley in California).

The middle of Death Valley is a saltwater swamp.

They did not have to cross rivers in the bottoms of uncrossable canyons (like in Arizona).

They did not see vast sagebrush plains with no source of water (like in central Nevada).

They did not see weird “forests” like this one (Joshua trees in California).

In short, they were pretty lucky. The route they took was certainly tough, but it was not impossible with their technology.

What they went through: a map-based summary

To help you review these different environments, you can look at some photos and match them with locations on a map of the United States.

You can also read some notes from the diary of William Clark... and try to put them in geographic order from east to west

And you can try to decide what equipment you would take if you were going with the Expedition.