Crossings which are intended to be left in place to allow for access to the tract with as little impact to water quality as possible.
Crossing that are installed for a short period to allow access to the tract during an operation, and are removed after the operation is complete. Often the types of materials used to construct a temporary crossing are very different from those used to construct a permanent crossing. Logging mats, logs, or brush are common materials used to construct a temporary crossing. Temporary crossings can obstruct or alter channel flow, so it is very important to remember to remove a temporary crossing after it is no longer needed.