Reduced Inspection Interval
Chapter 6 of this manual includes a load rating flow chart for concrete bridges without plans. This flow chart requires that concrete structures which have no plans showing reinforcing details, are new to the Inventory, and are without structural distress will be in inspected at either 12- or 24-month intervals. Those bridges which have not been carrying unrestricted traffic for at least 4 years will receive inspections every 12 months. Additional clarifications are made for those bridges exhibiting distress or those which do not follow other geometric characteristics. Chapter 6 also includes flow charts for load posting guidelines that includes TxDOT policy on inspection interval for on-system and off-system bridges. The reduced inspection interval for routine inspections is summarized in the table below. The level of inspection for routine inspections on structures with reduced inspection interval will be the same as that required for those scheduled on a 24-month interval.
Bridges meeting any of the criteria below require reduced inspection interval of 12 months:
- Concrete Bridge without plans, without structural distress, and structure age < 4 Years
Bridges meeting the criteria below require reduced inspection interval of 6 months:
- Off-System Structure with IR < HS 3, OR > HS 3, and posted based on inventory rating
- On-System Structure with IR < HS 3, OR > HS 3, and posted based on inventory rating
Bridges meeting the criteria below require reduced interval inspection of ≤ 12 months per Method 1 provisions:
- Deck Condition Rating (Item B.C.01) ≤ 3 [Deck Condition Rating (Item 58) ≤ 3]
- Superstructure Condition Rating (Item B.C.02) ≤ 3 [Superstructure Condition Rating (Item 59) ≤ 3]
- Substructure Condition Rating (Item B.C.03) ≤ 3 [Substructure Condition Rating (Item 60) ≤ 3]
- Culvert Condition Rating (Item B.C.04) ≤ 3 [Culvert Condition Rating (Item 62) ≤ 3]
- Scour Condition Rating (Item B.C.11) ≤ 3 [Scour Critical Bridges (Item 113) ≤ 3]