Kleinschmidt initiated the project with pre-screened alternatives at the kickoff meeting which proposed five alternatives for the client’s further evaluation. Following their decision to go with a non-rising stem Vertical Life Gate, Kleinschmidt developed a 30% civil design of the gate that provided the gate manufacturers the details they need to provide a gate that can be installed in the existing space and defining in detail the civil modifications required for the installation of that gate. After the client selected the gate manufacturer, Kleinschmidt completed the civil and electrical designs. During constructability conversations with the client, we proposed a floating bulkhead to allow de-watering of any single spillway bay (no stop log slots existed). This would not only accelerate gate installation but also allow more efficient inspection and maintenance on any existing spillway gate. The client agreed with this approach and we then prepared separate gate procurement specifications for the liftgate and floating bulkhead. Kleinschmidt also provided bidding and construction assistance.

The existing traveling cranes along the spillway deck limited overhead space and prevented most traditional gate systems. An innovative non-raising stem approach avoided interferences and a new floating bulkhead system saved time and money Kleinschmidt’s design met the client’s interests in improving operator safety by developing a design that allows for remote operation under adverse conditions, is reliable, and can withstand ice and debris typical of the Mississippi River. Kleinschmidt’s floating bulkhead saved costs by minimizing cofferdams and existing spillway modifications along with a focus on constructability.