Title
Introduction

Salmon were a central part of life in the Columbia River Basin for the first Americans and, to a lesser extent, to early European immigrants; that is, as long as the salmon populations existed in abundance and held a central place in the region's economy. That is no longer the case and has not been so for nearly a century. Depletion of the salmon population by over fishing, construction of dams, agriculture and resource extraction such as logging and mining have all played a role in the decline.

This unit explores each of these aspects of the history of salmon in the Columbia Basin allowing you to become familiar with:

Columbia River Basin
To... Click...
• Navigate your map
• Change the basemap
• Zoom in/out
• Display data in a table
• Open a feature's pop-up window
• Use a bookmark
• Change feature styles
• Filter data
• Measure distance/area
• Share your map
Viewing web maps
Choosing a basemap
Viewing web maps-Navigate
Show table
View pop-ups
Access bookmarks
Change style
Apply filters
Measure
Create Presentations

But first, open the large version of the Columbia Basin map at the right and acquaint yourself with the geography of the Columbia River Basin as you address the questions below.

To Start You Thinking

The Columbia River Basin occupies a large portion of the northwest corner of the continental United States.

1) Identify the three major rivers in the Columbia Basin.

2) Identify the mountain ranges that form the rim of the basin that drains to the Pacific Ocean at the mouth of the Columbia near Astoria, Oregon.

3) Turn on the Lewis & Clark Trail layer in the map. The red route represents the expedition's westward journey. As you can see by following the route, Lewis and Clark entered the Columbia drainage south and west of Butte, Montana. Switch to an imagery or the topographic basemap and zoom in on the area where they crossed into the Columbia Basin. Describe the topography of the region and explain how you know that they were crossing a divide from one river basin to another - in fact, the Continental Divide.

4) Notice in the map that the northern boundary of the Columbia Basin is shown along the United States - Canada border and that obviously the Columbia River continues into Canada. Print a copy of the map so that Britsh Columbia is included and sketch on it the actual boundary of the Columbia River Basin beyond the Canadian border. Be prepared to explain how you determined the boundary.

Last modified in April, 2017 by Rick Thomas