Defining a “road bridge” as a structure with a span of 1.5m or more providing public highway passage for motor vehicles over an obstacle such as a watercourse, railway, road or valley, please provide the following information for all road bridges for which you own as highway authority, including those which are jointly owned with another authority, but for which you are the lead authority: 1. How many road bridges are you responsible for maintaining? 2. For the last financial year (2019/20) how many Principal Inspections have taken place 3. For the last financial year (2019/20) how many General Inspections have taken place? 4. For the last financial year (2019/20) how many Structural Reviews and/or BD21 assessments have been conducted? 5. How many sub-standard (in terms of capacity) and/or weight restricted bridges do you have? 6. Of these, how many do you intend to return to full load carrying capacity in the next 5 years? 7. How many bridges would you return to full load carrying capacity if you had no resource restrictions? 8. (i) How many of your bridges require post tensioned special inspections (PTSIs)? (ii) How many of those have had PTSIs within the last 18 years? (iii) Of those that have not had a PTSI, how many require/are due one? (iv) How much funding would you anticipate is required to remove the backlog of PTSIs for those bridges identified in Q8(iii)? 9. In monetary terms, what is the current Depreciation (i.e. difference between your GRC and DRC as declared for your WGA return for 2019/20)? 10. Have you calculated your back log (or workbank) for bridges? What is the calculated value of your backlog of road bridges, or your best estimate if a calculated value is not available? 11. (i) What is the annual revenue works budget for maintaining your bridge stock? (ii) What is the annual capital works budget for maintaining your bridge stock? (iii) What total budget would you estimate is required to maintain the bridge stock at its current level (standstill budget)? 12. (i) How many BD97 Stage 1 Scour Assessments did you undertake in 2019/20? (ii) How many BD97 Stage 2 Scour Assessments did you undertake in 2019/20? 13. (i) How many bridges under your management collapsed in the last 12 months? (ii) Was it a full or partial collapse? Full / Partial (iii) Would you be happy to share the detail with members of the UK Bridges Board? Y/N

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TfL Ref: FOI-1335-2021

Thank you for your request received by Transport for London (TfL) on 13 October 2020.

Your request has been considered in accordance with the requirements of the Freedom of Information Act and our information access policy. I can confirm that we hold the information you require. You asked:

1. How many road bridges are you responsible for maintaining?

    

2. For the last financial year (2019/20) how many Principal Inspections have taken place

    

3. For the last financial year (2019/20) how many General Inspections have taken place?

    

4. For the last financial year (2019/20) how many Structural Reviews and/or BD21 assessments have been conducted?

    

5. How many sub-standard (in terms of capacity) and/or weight restricted bridges do you have?

    

6. Of these, how many do you intend to return to full load carrying capacity in the next 5 years?

    

7. How many bridges would you return to full load carrying capacity if you had no resource restrictions?

    

8. (i) How many of your bridges require post tensioned special inspections (PTSIs)?

    

   (ii) How many of those have had PTSIs within the last 18 years?

    

   (iii) Of those that have not had a PTSI, how many require/are due one?

    

   (iv) How much funding would you anticipate is required to remove the backlog of PTSIs for those bridges identified in Q8(iii)?

    

9. In monetary terms, what is the current Depreciation (i.e. difference between your GRC and DRC as declared for your WGA return for 2019/20)?

    

10. Have you calculated your back log (or workbank) for bridges? What is the calculated value of your backlog of road bridges, or your best estimate if a calculated value is not available?

     

11. (i) What is the annual revenue works budget for maintaining your bridge stock?

     

    (ii) What is the annual capital works budget for maintaining your bridge stock?

     

    (iii) What total budget would you estimate is required to maintain the bridge stock at its current level (standstill budget)?

     

12. (i) How many BD97 Stage 1 Scour Assessments did you undertake in 2019/20?

     

    (ii) How many BD97 Stage 2 Scour Assessments did you undertake in 2019/20?

     

13. (i) How many bridges under your management collapsed in the last 12 months?

(ii) Was it a full or partial collapse? Full / Partial

(iii) Would you be happy to share the detail with members of the UK Bridges Board? Y/N

QUESTION	2019/20	Comments
1)	346
2)	186	Full breakdown is included in the attached spreadsheet.
3)	415	Full breakdown is included in the attached spreadsheet.
4)	2
5)	35	Excluding substandard culverts (3), subways (3) & footbridges (2).
6)	14
7)	With no resource constraint, all highway structures on the TfL road network would be strengthened to carry all traffic
8) (i)	92
8) (ii)	81
8) (iii)	11	Large scale post tensioned special inspections of Westway Flyover in progress in 19/20 and remainder are programmed.
8) (iv)	£4.2M	Includes total costs of Westway Flyover total cost.
9)	£2,241,190	Value provided for Chartered Institute of Public Finance and Accountancy (CIPFA) WGA return in 19/20 for 18/19. However, the request from CIPFA with latest toolkit for calculation of 19/20 values has not yet been received by TfL - awaiting updated form from CIPFA.
10)	£700-900M	This excludes inflation.
11) (i)	Please see the answer in the below table.
11) (ii)	£5.8M	Budget reflects the ‘Do minimum targeted works’ strategy in place for the given financial year.
11) (iii)	£60-70M
12) (i)	TfL has not carried out any scour assessments during 2019/20 as in previous years the risk of scour was deemed to be too low. However, if flooding occurred then we would carry out scour inspections.
12) (ii)	As above.
13) (i)	None	No instances of collapses defined as ‘a structure (bridge) falling down or giving way’
13) (ii)	N/A
13) (iii)	Yes

Question 11(i) Table

We do not hold data specifically for bridges but have data for all structures, costs for the 19/20 financial year are as follows:

Activity	Cost (£)
Bridges and other Structures Lump Sum Maintenance	1,533,189.82
Structures General Inspections	1,011,005.91
Structures Principal Inspections	1,264,525.30
Structures Ordered Maintenance	1,186,948.59
Structures Interim Measures (Monitoring)	2,254,033.05
Total :	7,249,702.67

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Yours sincerely

Eva Hextall

FOI Case Management Team

General Counsel

Transport for London

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