Section 106 of the National Historic Preservation Act of 1966 requires federal agencies to consider the effects on historic properties of projects they carry out, assist, […]
A hydraulic gate that operates in vertical guides and has no wheels, rollers, or other friction-reducing devices. Normally, such a gate must be opened or closed […]
Large logs, timbers, or steel beams placed on top of each other with their ends held in guides on each side of a channel or conduit […]
A dam gate designed to control flow through large waterway openings. They may be designed as either upward or downward (skimmer) opening. A roller or fixed […]
A structure over or through which flow is discharged from a reservoir. If the rate of flow is controlled by mechanical means, such as gates, it […]
A type of roller-mounted vertical lift gate supported along either side by stainless steel roller chains.
A subsidiary dam of any type constructed across a saddle or low point on the perimeter of a reservoir.
A system of pipe and/or pervious material along the downstream toe of a dam used to collect seepage from the foundation and embankment and convey it […]
A stone masonry dam in which the stones are unshaped or uncoursed.