It details the steps of building bridges and retaining walls, including the preparation ... The film emphasizes the engineering marvels of the 20th century, particularly the Columbia River Highway ...

and should not be used to build walls taller than 4 feet. Note, however, that most jurisdictions require permits and engineering drawings for all retaining walls over 3 to 4 feet in height ...

However, they require precise engineering and construction practices, including substantial concrete footings below frost depth, to ensure durability and performance. Embedded retaining walls, such as ...

The Lake County commissioners unanimously awarded a bid contract amounting to $1,052,928 to Alan Stone Co., Inc., based in ...