The charts only show air draft for the center span of the Chesapeake Bay Bridge (160 feet or so). There are no clearance boards on the other spans. Its a PIA if there is a lot of commercial traffic because everyone uses the center span. I probably could fit under 10 or more spans, but I'll only try a couple. When I pass under a bridge I have no depth perception.
Joel <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Tue, Mar 23, 2021 at 10:58 AM Dennis C. via CnC-List < cnc-list@cnc-list.com> wrote: > I take the NOAA charted clearances with more than a grain of salt. We > tend to think of bridges as wonderful fixed construction projects. > However, many older bridges may have subsided and have less than stated > clearances. > > I tend to trust the clearance boards but add a safety factor. > > FYI, some bridges have more clearance a span or two out of the channel. > For instance, according to local "knowledge", the bridge at Navarre Beach, > FL has a foot or two more clearance two spans south of the charted > channel. This is due to the design of the bridge. The metal girders > supporting the roadway in the three center spans are several feet thick > because the spans are wide. Away from the charted channel, the spans are > short. Those spans are supported by shorter concrete T girders. The > shorter girders allow more clearance. > > Passing under a bridge outside the charted channel incurs risk. You > really don't know what the air clearance is and you don't know if there's > good depth. I've never done it. > -- > Dennis C. > Touche' 35-1 #83 > Mandeville, LA > > On Tue, Mar 23, 2021 at 9:24 AM Andrew Burton via CnC-List < > cnc-list@cnc-list.com> wrote: > >> Charles, what sources are you using for the C May bridges? NOAA charts >> list them as 55’ at high water. >> Andy >> >> Andrew Burton >> >> Thanks to all of the subscribers that contributed to the list to help > with the costs involved. If you want to show your support to the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > Thanks - Stu -- Joel
Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
