How to Make a Scale Model of Mount St. Helens' Volcano

Written by jeremy cato
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How to Make a Scale Model of Mount St. Helens' Volcano
Days before the eruption, Mount St. Helens looked menacing. (Volcano walk image by Emma Delmonte from

On May 18, 1980, Mount St. Helens, a volcano located in Washington. This became the most famous and widely published volcanic eruption in the United States, according to the U.S. Geological Survey. It still stands and remains an active volcano today. The best way to experience the wonders of Mount St. Helens and the surrounding area is to go there is person, but if you cannot, the next best way is to make a scale model of the volcano. By carefully moulding clay, you can create an impressive and realistic facsimile.

Skill level:
Moderately Easy

Things you need

  • Square of foamcore board, 3 square feet
  • Ruler
  • 3.63kg. of grey modelling clay
  • 0.454kg. white modelling clay
  • 1 foot of aluminium foil
  • 2 packages of miniature craft display trees
  • 1 package of miniature craft display animals

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  1. 1

    Determine the scale. Since you are making a scale model of Mount St. Helens, you will need to determine what the scale will be. Since Mount St. Helen is now 8,365 feet in elevation, it is recommended you use a scale of 1 to 8365. This means that your model will be 1 foot tall, making it 8,365 times smaller than the actual volcano.

  2. 2

    Make a large mound from the grey clay on the foamcore board. The base of this mound should be about 24 inches wide and should rise up 8 inches. The mound should be slightly elliptical, meaning that the base should be like an oval rather than a circle. This is closer to the actual shape of the mountain.

  3. 3

    Form the white clay into a ball and place it on top of the mound and press the bottom of the white clay ball into the top of the mound, blending the two colours evenly so the grey clay gradually mixes into the white. The top of the volcano model will still be white, the centre a mottled light grey and the bottom grey. The model should also now be 12 inches high.

  4. 4

    Press your fist into the centre of the white clay at the top of the model to create the now-famous caldera in the volcano. Press down until you can see the grey clay under the white. Build up the sides of the caldera so that its shape appears most like the Mount St. Helens of today. Use a picture as a guide.

  5. 5

    Crumple the 1-foot sheet of aluminium foil into a loose ball, then unravel it. Press this crumpled foil sheet into the sides of the volcano model to give it a rough, rocklike texture on all sides.

  6. 6

    Press the trees and animals into the model around the base of the volcano.

Tips and warnings

  • If desired, you could turn this into an "active" volcano by building the model around a 499ml. bottle filled with 3 tbsp of baking soda, a few drops of dish soap and 1/2 cup water. Leave the mouth of the bottle exposed. Pour 1/2 cup vinegar into this bottle in the volcano. It will create a foamy eruption.

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