"People that use our harbor were concerned with 400-600 small vessels in a two-mile stretch of river with no regulation on speed with boats zipping up and down," he said. Add in the big commercial vessels and it creates lots of dangerous conditions. Besides safety issues, Molloy said boat wakes during high tide can damage property and create riverbank erosion. The city will also install signs at the boat launch and on buoys reminding boaters to slow down to 5 mph in no-wake zones during high tide.