Overwater Structures Sample Clauses

Overwater Structures. In addition to shading, over-water structures that create areas of darkened water can impede or delay long- shore migrations of juvenile salmonids. Studies in Washington State have shown that schools of juvenile chinook and chum salmon pause in their migration when encountering an over-water structure that creates a darkened area of water, such as a marginal wharf or wide pier. Piers that are constructed close to water or are made of dark materials, such as treated wood, are especially daunting to migrating fish (e.g., Pentec, 1997). In the Xxxxxxx Access Project, there is little expectation that an elevated bridge, constructed of concrete, would create light conditions that would impede salmon migrations, although the low elevation causeways along the northeast edge of the airport under the northern bridge alternatives (C3a, C3b, C4) could cause fish to alter their migration corridors.