Wren Works Marine Division is Making Waves

Wren Works Marine Division is Making Waves Duluth Coastal Infrastructure Rehabilitation Project  Edited by Debbie Reaney  Sinkholes at seawalls, also known as earth subsidences, are a common phenomenon occurring wherever seawalls encounter forces of moving water, such as tides, waves, or boat and ship traffic. Additionally, they may occur where older seawalls or seawall caps have deteriorated, allowing water to move behind the seawall and attack backfill and infill. ... Read more