Why are temporary stream crossings usually used only for Department of Transportation projects?

Temporary stream crossings typically require specific environmental permits due to their potential impact on aquatic ecosystems and water quality. These crossings are often employed during construction activities to facilitate access across streams, yet they must adhere to environmental regulations to protect sensitive areas and minimize disturbances. Since these crossings are not intended for long-term use, their installation involves a careful evaluation to ensure compliance with local, state, and federal environmental guidelines.

In contrast, permanent solutions usually involve more extensive planning and construction practices that are designed to ensure ecological integrity over the long term, which is why temporary solutions are generally more common in projects overseen by the Department of Transportation. The necessity for permits ensures that any temporary crossing does not adversely affect stream health, fish passage, or water quality during the construction phase.