Option 6 for Dam Crossing
- While I understand it was not outlined by the VHB consulting firm last
night, there is an "option 6" for the dam crossing:
Build small pedestrian drawbridges crossing over the smaller locks
(the largest lock is not opened often enough to worry about).
With this solution, there will be no need to raise the drawbridges
when smaller boats (e.g. powerboats, kyacks) slip underneath. The
drawbridges need only be raised briefly at high tides or when a
sailboat passes. This resolves most of the pedestrian delay issues,
and should come in only a little bit more expensive than Option 1.
These structures are much more common in Europe than the USA. Some
designs require only minimal foundations or mounting. The dam
structure need supply only enough support to raise the (empty) bridge
to the retracted position. and the existing hollow structure is not