Bonnet Carré Spillway flood of 1937, and ten times thereafter through 2016 to lower river stages at New Orleans. The most recent opening began March 8, 2018, when river levels in New Orleans were predicted to approach the flood stage of at the Carrollton Gauge which is located just upriver from Downtown New Orleans. The floodgate inlet is offset into the Mississippi River bank, at a location that had seen natural flooding for at least two centuries. The concrete structure has been designed to reduce settling into the riverbank. The opening and closing of the spillway is done by lifting out up to
Pequannoc Spillway Pequannoc Spillway The Pequannoc Spillway is a run-of-the-river spillway constructed in the 1920s as part of the Morris Canal system in the Pompton Plains section of Pequannock, New Jersey on one bank of the river and Wayne, New Jersey on the other bank. The spillway creates usable waterfront land out of swamps and provides water retention by creating a backwater on the Ramapo River. The structure is listed as part of the Morris Canal on the New Jersey Register of Historic Places as well as the National Register of Historic Places. It is a sister structure to the Pompton dam