The Washington Baum Highway 64 Bridge, with a fixed vertical clearance of 65ft, crosses Roanoke Sound Channel just south of Shallowbag Bay.

Note that the tide boards are missing from the Washington Baum Bridge (hwy 64) just south of Manteo ‘“ makes it exciting for those with tall masts as the antennas go click click click on the way through!
John Kremski

Capt. Kremski contacted the NCDOT regarding the missing tide boards:
Date/Time: 8/26/2012 11:21:13 AM
To the North Carolina Department of Transportation:
The tide boards are missing from both the Washington Baum Bridge (highway 64) at Manteo and also the Joseph Palmer Bridge Highway (highway 158) at Coinjock. I have a tall mast and this route is the only way I can travel in NC; but it is not safe due to having no way judge if water levels are abnormally high or not.
Can you let me know if this will be fixed soon? I would like to return to NC again, but am not willing to risk my boat (or at least my mast!)
John Kremski

And the response from NCDOT:
Date/Time: 8/27/2012 3:16:59 PM
Mr. Kremski,
Thank you for bringing this to our attention, hopefully we can get some new signs fabricated and have them installed within the next month or so.
Thanks again.

UPDATE:
New tideboards are in place on the Washington Baum Bridge ‘“ both north and southbound ‘“ Sept. 9, 2012
S/V Mystic Star

Click Here To Open A Chart View Window, Zoomed To the Location of Washington Baum Bridge