Good Afternoon Building Officials. For those of you who have commercial riverfront property, how often does your city require structural inspections of the commercial seawalls, riprap, dikes etc. to ensure there's no collapse at the shoreline? We are considering making it every 5 years by a state licensed engineer hired by the property owner. We've reached out to the Army Corps of Engineers to see if we are on the right track and so far the reply is, "it’s up to you", which is no help at all. Thanks in advance!