How do lunkers benefit a habitat and what are the advantages and disadvantages of using them?

Lunkers provide overhead cover and shade for fish, create a low velocity resting place, and function as an ambush site for predatory fish. They can be used with other bank stabilization measures, are easy to construct, and can be used by a variety of fish species and age classes. However, lunkers that aren’t placed properly can catch debris and ice, constrict flow and cause damage downstream, and require annual maintenance if they get filled in with debris over time.