It was further altered by dredging to remove sediment and by construction of the Sediment Retention Structure on the river's north fork.
•
The United States Army Corps of Engineers dredged sediment from the river and built the $65 million Sediment Retention Structure on the North Fork Toutle River to prevent debris from continuing downstream.
Mississippi River | River Thames | Amazon River | Columbia River | Hudson River | Colorado River | Potomac River | river | Ohio River | Missouri River | Delaware River | Murray River | River Tyne | Madeira River | Volga River | River Nene | River Clyde | River Trent | River Severn | Amur River | River Wear | Allegheny River | Red River | Dnieper River | Yarra River | Paraná River | River Tees | Fraser River | Yangtze River | Tocantins River |