The history of the use and effectiveness of instream structures in the United States

Abstract

The use of instream structures, devices designed to improve fi sh habitat, began as early as 1880 in the United States and continues today. The practice of stream improvement was partially motivated by the desire to compensate for overfi shing problems. Many of the practices that involve the use of instream structures emerged during a time period when scientifi c-management principles offered the hope that humans could eliminate perceived ineffi ciencies and increase biological productivity in natural systems. Decades later, modern criteria of instream structures trace many of their details of design to experimental devices employed in the 1920s and 1930s. However, problems with the use of many styles were noted soon after they were fi rst deployed, and many of these troubles persist today. Dams can be undermined and outfl anked by fl ows. Defl ectors disrupt the bed and hamper the development of food organisms. Finally, cover structures suffer from siltation problems and longterm decay, which renders the devices useless. The best possible long-term solution to improved health of riverine fi sheries may be to avoid the use of static engineering structures when possible and focus on reforestation and erosion control in the watersheds. Even this recommendation dates back over 65 years to the period when the use of instream structures fi rst began to fl ourish in the United States.