Lock Rehabilitation, a Public Infrastructure Proglem: the Value of Increased Productivity in Mean Lockage Performance [open pdf - 3MB]
"This partial equilibrium analysis takes a step toward providing a framework for providing some of the information that is needed to replace historically and politically based assertions about public infrastructure 'needs' with more objective economic analysis. In particular it concentrates on the problem of determining optimal levels and timing of rehabilitation of existing infrastructure capital in the Nation's inland waterways navigation system."
IWR Report 87-R-1; Institute for Water Resources Report 87-R-1
U.S. Army Corps of Engineers: http://www.usace.army.mil/