Chickamauga Dam: Power, Water, and Wildlife
Materials Needed
- Paper, pencil, and colored pencils or markers
- A shallow plastic bin, baking dish, or sink
- Small cups, craft sticks, modeling clay, or building blocks
- Water and a towel
- A ruler or measuring tape
- Optional: computer or tablet for viewing a map of the Tennessee River and Chickamauga Dam
- Optional: stopwatch or phone timer
- Optional: recycled materials for a dam-design challenge
Lesson Snapshot
Age: 11
Learner: Olivia
Suggested time: 60–90 minutes, or two shorter sessions
Subjects: Science, geography, engineering, history, writing, and environmental studies
Learning Objectives
By the end of the lesson, Olivia will be able to:
- Locate Chickamauga Dam on the Tennessee River near Chattanooga, Tennessee.
- Explain at least three purposes of the dam, such as producing electricity, controlling water levels, helping boats travel, and supporting recreation.
- Describe how moving water can be changed into electrical energy.
- Build or sketch a simple dam model and explain how its design affects water flow.
- Identify one benefit and one possible environmental challenge connected to dams.
Success Criteria
Olivia is successful if she can:
- Point to or describe the location of Chickamauga Dam.
- Use the words river, dam, reservoir, turbine, generator, hydroelectricity, and ecosystem correctly.
- Explain the basic path of water through a hydroelectric power station.
- Complete a dam model or labeled design.
- Give evidence for both a benefit and a challenge of building dams.
Introduction: Hook and Wonder Question
Hook: Imagine you are standing beside a huge wall across a river. Behind the wall is a large lake, boats can pass through the area, and moving water helps make electricity for nearby communities. How could one structure do all of that?
Tell Olivia:
Today we will investigate Chickamauga Dam. We will learn how it changes the flow of the Tennessee River, how it can help produce electricity, and how engineers must think about people, boats, animals, and the environment.
Quick Prediction
Ask Olivia to answer these questions in her notebook:
- What do you think a dam is designed to do?
- Where do you think the water goes when it reaches a dam?
- How might moving water create electricity?
Have Olivia share her ideas aloud or write them down. Tell her that scientists and engineers often begin with predictions and then test them.
Background: What Is Chickamauga Dam?
Teacher Talking Points
- Chickamauga Dam is on the Tennessee River near Chattanooga, Tennessee.
- It is operated by the Tennessee Valley Authority, often called the TVA.
- The dam was completed in the 1940s as part of a larger plan to manage the Tennessee River.
- The water held behind the dam forms Chickamauga Lake, also called a reservoir.
- A dam is not simply a wall. It is part of a system that may include gates, power equipment, navigation facilities, roads, and areas for recreation.
- Water released through the dam can spin turbines. The turbines turn generators, which produce electricity.
- The reservoir and river are used by people for activities such as boating, fishing, and wildlife watching.
- Dams can also change habitats, water temperature, and the way fish move through a river. Engineers and environmental scientists study these effects.
Key Vocabulary
- Dam
- A structure built across a river to hold back or control water.
- Reservoir
- A lake or storage area created when water is held behind a dam.
- Turbine
- A wheel or machine that spins when moving water, air, or steam pushes it.
- Generator
- A machine that changes motion into electrical energy.
- Hydroelectricity
- Electricity made by using moving water.
- Ecosystem
- A community of living things and the nonliving parts of their environment.
- Navigation
- The process of moving safely from one place to another, especially by boat.
Body Part 1: I Do — Follow the Water
Use a simple drawing or describe the path with your hands:
- Water flows down the Tennessee River.
- The dam holds back some of the water and creates a reservoir.
- Water can be released through controlled openings.
- The moving water pushes against turbine blades.
- The turbine spins a generator.
- The generator produces electricity.
- Water continues downstream after passing through the dam.
Draw this chain for Olivia:
Moving water → turbine spins → generator works → electricity is produced
Check for Understanding
Ask Olivia:
- What makes the turbine spin?
- What does the generator produce?
- Why might a dam need gates or controls?
Expected idea: Moving water spins the turbine. The generator produces electricity. Gates help control how much water moves through or around the dam.
Body Part 2: We Do — Map and Purpose Investigation
Activity A: Locate the Dam
Using a map, help Olivia find:
- The Tennessee River
- Chattanooga, Tennessee
- Chickamauga Dam
- Chickamauga Lake
Olivia may use a printed map, a digital map, or draw a simple map from memory after looking at one.
Map Challenge
Have Olivia add these labels to her map:
- Upstream: the direction the water comes from
- Downstream: the direction the water travels
- Dam
- Reservoir
- Nearby city or community
Ask: Why would a dam be useful near a river and communities?
Activity B: Four Jobs of a Dam
Write these four possible jobs on separate pieces of paper:
- Make electricity
- Control water levels
- Help boats travel
- Provide places for recreation and wildlife
Olivia chooses one job and explains it using this sentence frame:
“Chickamauga Dam can help with __________ because __________.”
Repeat until she has explained all four jobs. For an added challenge, have her rank the jobs from most important to least important and defend her choices.
Body Part 3: We Do — Build a Water-Control Model
Safety note: Use only a small amount of water indoors, clean up spills quickly, and never visit or approach a real dam, spillway, or riverbank without a responsible adult. Real dams have strong currents and dangerous areas.
Instructions
- Place a small amount of clay, blocks, or craft sticks across one end of a shallow bin.
- Leave a small opening in the structure.
- Pour water slowly on one side of the model.
- Observe what happens when the opening is small, large, blocked, or moved.
- Use a ruler to measure the water level on the reservoir side.
- Record observations in a table.
| Model Change | What Happened to the Water? | What Did You Notice? |
|---|---|---|
| Small opening | ||
| Large opening | ||
| Opening blocked | ||
| Dam made stronger or taller |
Discussion Questions
- What happened when the opening became larger?
- What happened when the opening was blocked?
- How is this model like a real dam?
- How is the model different from a real dam?
- Why would engineers need to control water carefully?
Body Part 4: You Do — Engineer a Better Dam
Olivia is now the lead engineer for a small river community. Her job is to design a dam that meets several needs:
- Hold back some water
- Allow controlled water release
- Provide a way for boats or fish to continue moving, if possible
- Protect nearby homes and habitats
Design Choices
Olivia may choose one of the following projects:
- Build: Create a small model using recycled materials.
- Draw: Sketch a labeled dam design.
- Explain: Make a short presentation or recorded explanation.
- Write: Create a one-page engineer’s report.
Required Labels or Ideas
Her design must show or explain:
- Where water collects
- Where water is released
- How electricity could be produced
- How boats or fish might move through the area
- One way to reduce environmental harm
Engineer’s Report Sentence Starters
- “My dam is designed to…”
- “Water enters or leaves the system by…”
- “The turbine would spin because…”
- “A benefit of my design is…”
- “One possible problem is…”
- “I would improve my design by…”
Real-World Connection: Benefits and Challenges
Explain that most large engineering projects have both helpful and difficult effects.
Possible Benefits
- Hydroelectric power can provide electricity without burning fuel at the power station.
- Water levels can be managed during changing conditions.
- Boats can use waterways for transportation.
- Reservoirs can support boating, fishing, and other recreation.
- People can study and protect plants and animals around the river.
Possible Challenges
- A dam can change the natural flow of a river.
- Some habitats may be covered by a reservoir.
- Fish may have difficulty traveling upstream or downstream.
- Water temperature and sediment movement may change.
- Communities may need to make difficult decisions about land and water use.
Think-Pair-Share or Homeschool Discussion
Ask Olivia to think silently, discuss with a partner or family member if available, and then give her answer:
Should engineers think only about producing electricity when they design a dam? Why or why not?
Look for an answer that mentions more than one group, such as people, boaters, fish, plants, wildlife, or nearby communities.
Formative Assessment Checks
- Vocabulary check: Olivia explains three vocabulary words without looking at the definitions.
- Water-flow check: Olivia points to the reservoir, opening, turbine, and downstream area in her model or drawing.
- Explain-it check: Olivia completes the sentence: “Hydroelectricity is made when…”
- Cause-and-effect check: Olivia explains what might happen if too much water is released too quickly.
- Evidence check: Olivia gives one observation from her model that supports her explanation.
Summative Assessment: Chickamauga Dam Expert Challenge
Olivia completes the challenge by choosing one format: a poster, model, oral presentation, slideshow, or written report.
Her final product must answer these questions:
- Where is Chickamauga Dam?
- What is a reservoir?
- How can the dam help produce electricity?
- What are two other purposes of the dam?
- What is one benefit and one challenge of dams?
- What design choice would help people or wildlife?
Simple Rubric
| Category | Excellent | Developing |
|---|---|---|
| Location and facts | Correctly explains the location and several accurate facts. | Includes some correct information but needs more detail. |
| Energy explanation | Clearly explains water, turbine, generator, and electricity. | Explains part of the process but misses one or more steps. |
| Engineering design | Design is labeled and shows controlled water movement. | Design is present but needs clearer labels or explanations. |
| Environmental thinking | Explains both a benefit and a challenge with a thoughtful solution. | Names a benefit or challenge but gives little explanation. |
| Communication | Ideas are organized, clear, and supported by observations. | Ideas are understandable but may be incomplete or disorganized. |
Differentiation and Adaptations
Support for a Learner Who Needs More Help
- Use a word bank with pictures or simple definitions.
- Complete the water-flow drawing together before asking Olivia to draw one independently.
- Use sentence starters such as “The dam helps by…” and “The water moves…”
- Allow Olivia to give answers orally instead of writing every response.
- Build a very simple model with only a wall, water, and one opening.
Extension for a Learner Ready for More Challenge
- Research how fish passages or fish ladders help some fish move around dams.
- Compare hydroelectric power with solar or wind power.
- Calculate how much water moves through the model in 10 seconds using a measuring cup.
- Write a letter to a community leader explaining whether a proposed dam should be built.
- Investigate how floods, droughts, and changing rainfall could affect dam operations.
Alternative Formats
- Classroom: Small groups can act as engineers, environmental scientists, boat captains, and community members.
- Homeschool: A family member can interview Olivia about her dam design.
- Digital: Olivia can create a labeled slide or digital drawing instead of a physical model.
- Low-material option: Use a pencil sketch and a cup of water to demonstrate the main idea.
Conclusion: Recap and Reflection
Three-Sentence Recap
Ask Olivia to complete these sentences:
- “Chickamauga Dam is located…”
- “Moving water can make electricity by…”
- “One important thing engineers must consider is…”
Exit Ticket
Olivia answers without using her notes:
- What is one job of Chickamauga Dam?
- What is the difference between a dam and a reservoir?
- What happens when moving water spins a turbine?
- What question do you still have about dams or rivers?
Final Takeaway
A dam is an engineering system that changes how water moves. Chickamauga Dam helps manage the Tennessee River, supports hydroelectric power, assists navigation, and provides opportunities for recreation. At the same time, responsible engineers must consider how dams affect communities, fish, plants, and the entire river ecosystem.