Effects of Oregon DamsMrs. Olson

Introduction

• My topic is Oregon Dams

• I believe that Oregon dams, like many resources available to American’s, have negative and positive impacts on people and the environment.

How do dams increase or diminish the natural environments capacity to support human life?

Increase Capacity • Provides clean energy • 38% of Oregon energy is

hydroelectric• Irrigation control• Flood control• Water storage

Decrease Capacity• Destroys tribal life• Destroys fishing• Changes the landscape• Reduces silt (nutrient rich

soil)

How do dams negatively and positively affect the environment?

Negative Impact• reduce river levels• Block rivers• Slow rivers• Alter water temperatures• Decrease oxygen levels in

the water• Hold back silt, debris,

nutrients

Positive Impact• Flood control

Changing Viewpoints on Dams

• 50 years ago: Control and harness nature for the benefit of man

• 10 years ago: Dams are not needed (especially as alternative energy options growth) Dam removal discussions take place and some dams are slated for removal. Resistance to removal of dams by many groups

• Now: Many dams have been removed and attempts at restoring natural habitat to rivers have been made

Conclusion

• Dams have their place- they do provide control of water (and saving of water in reservoirs)

• Dams provide free and clean energy• Dams destroy natural habitats, river ecosystems,

and animal life

• Overall- Dams do have their place but they should be well researched and planned before being built