Existing Bridges with Known Foundations

The scour evaluation guidance for new bridges with known foundation also applies to existing bridges with known foundations.
In certain cases,
 existing bridges with known foundations 
may be evaluated
 for potential scour using the following:
The TSEAS Manual includes two parts: a) Secondary Screening Method; and b) Concise Analysis Method. The Secondary Screening Method is only applicable to low volume Off-System bridges with known foundations. The Concise Analysis Method is applicable to both On-System and Off-System bridges that are not on the interstate system or are 
otherwise
 high priority bridges. Bridges that would be considered high priority are:
  • Bridges on principal arterials;Bridges on evacuation routes;
  • Bridges that provide access to local emergency services such as hospitals; and
  • Bridges that are defined as critical in a local emergency plan (i.e., bridges that enable immediate emergency response to disasters).
Upon completion of a scour 
evaluation
 for an existing bridge, the
Scour Summary Sheet for Known Foundations
(Form 2605) is required to be completed and entered into the bridge inspection system, along with scour evaluation documentation
. In addition, the results of the scour 
evaluation
 are to be used to determine the Bridge Inspection Coding for Item 113 – Scour. The results of the coding need to be 
entered into the BIMS
.