Logjam (noun)

1. A blockage caused by a mass of logs or other debris that is blocking a river or other body of water.
2. A situation in which progress or action is blocked or greatly slowed by a mass of logs or other debris, or by a similar obstacle.

Origin:

From log + jam.

Examples:

1. The logjam caused the river to flood.
2. The logjam was caused by a beaver dam.
3. The logjam was cleared to prevent further flooding.
4. The logjam caused a delay in shipping.
5. The logjam was a problem that needed to be addressed immediately.