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Ind Tech Crossword Construction

Across
Type of bridge made from steel beams fastened in triangular shapes
A type of bridge that rests on girders
A layer of soil below a roadway
Large hole
Distance between bridge supports
Supports the end of abridge or dam
Type of bridge supported by the ground at only the ends
Metal tube that fits inside a tunnel for support
A concrete column used to add support to a foundation
A large machine used to lift heavy objects
Down
The part of a dam with gates to allow water to flow through
Type of bridge supported by cables
The part of a dam that holds back the water
A large shaft driven deep into the soil
The portion of a dam that allows excess water out of the reservoir