The January 2005 updated regulation, , underscores FHWA guidance regarding (POA) for scour critical bridges. TxDOT scour issues and countermeasure designs are handled by the Bridge Division, Geotechnical Section. Refer to the TxDOT Manual for more information. The regulation requires coordination with the (USCG) and USACE in providing adequate vertical and horizontal clearance for navigation on navigable waterways and is covered in the TxDOT .