The upstream and downstream boundaries of wing dam areas are parallel to and 50 m from the wing dam structures. The riverward boundaries are perpendicular to the riverward end of the wing dams. Boundaries of closing dam areas are parallel to and 50 m upstream and downstream of the structures. Where closing dams are close to the main channel border, the upstream boundary is across the mouth of the channel. The lateral boundaries are the apparent shorelines of the channel.
Revetted banks are the armored shorelines of the main and secondary channels.
Revetment on the UMRS is rock riprap or articulated concrete mats. Shorelines with concrete or steel bulkheads or paved levees are included in this category. In some locations, bank revetment is no longer connected to shore. Boundaries of revetted bank areas are the apparent shoreline, the upstream and downstream limits of the revetment, and a line riverward, parallel to and 15 m from the apparent shoreline. For revetments that are no longer connected to shore, the shoreward boundary of revetted bank areas is a line parallel to and 15 m from the top of the remaining revetment material.