Stream Simulation Design Process - USDA Forest Service

Bridges
•Foundation can sit on soil or rock foundations and usually
consist of:
– driven piles: good for soft soils, any soil, or when driven to
bedrock - noisy
– piers – usually drilled to bedrock or to firm ground
– retaining walls – shorten bridge but may cost more overall
– spread footings – economical where channel is stable.
Spread Footing Piers or piles