The major dams on the lower Snake River are primarily situated in southeast Washington, with one significant structure located approximately 40 miles downstream from Lewiston, Idaho.
While the question refers to a singular "Snake River dam," there are actually four principal federal dams located on the lower segment of the Snake River. These structures are integral to the region's infrastructure, supporting navigation, providing hydroelectric power, and managing water resources.
Location of the Lower Snake River Dams
All four of these prominent dams are located on the lower Snake River within the geographical area of southeast Washington. Their construction was completed between the 1960s and 1970s, establishing a vital transportation and energy corridor.
Key Dams on the Lower Snake River
The four major dams, listed in their downstream order, are:
- Lower Granite Dam: Positioned approximately 40 miles downstream of Lewiston, Idaho, this dam marks the upper end of the navigable Snake River system for commercial barges.
- Little Goose Dam: Situated further downstream from Lower Granite Dam.
- Lower Monumental Dam: Located downstream from Little Goose Dam.
- Ice Harbor Dam: The final dam on the lower Snake River, found downstream from Lower Monumental Dam before the river joins the Columbia River.
Overview of the Snake River Dams
These dams collectively facilitate a navigable waterway that stretches from the Tri-Cities area in Washington (Pasco, Kennewick, Richland) all the way to Lewiston, Idaho. This waterway is crucial for the barge transportation of various goods, including significant agricultural products from the region. Beyond their role in navigation, these dams are also significant contributors to the Pacific Northwest's energy supply through hydroelectric power generation.
Here's a quick reference for the locations and order of these dams:
| Dam Name | Primary Location | Proximity and Downstream Order |
|---|---|---|
| Lower Granite Dam | Southeast Washington | Approx. 40 miles downstream of Lewiston, Idaho (first downstream) |
| Little Goose Dam | Southeast Washington | Downstream of Lower Granite Dam |
| Lower Monumental Dam | Southeast Washington | Downstream of Little Goose Dam |
| Ice Harbor Dam | Southeast Washington | Downstream of Lower Monumental Dam (last of the four federal dams) |
