2018-08-07 S&O Agenda - Att 1 to Item 1 - Draft Bridges Asset Management Plan

The asset conditions are ranked according to the International Infrastructure Management Manual
(IIMM). The combined rating of these assets resulted in an average condition rating of 3 (Good). The
five underpasses included in this total all had a condition rating of 3 (Good), except the Girraween
Underpass that had a condition rating of 1 (New). Because of these condition ratings, the
underpasses have not been identified in the 10 year renewal program. These assets are grouped
consistently as Timber and Concrete and reported accordingly throughout this document. There are
two timber bridges (Old Noosa Rd Bridge & Mary River Rd Bridge) that have reached condition 5
and these bridges are being renewed in accordance with the 10-year capital works program.

The Bridge Working Group are currently developing a Level 2 and 3 bridge inspection priority
program. There is a current list of bridges that are being addressed for inspection over the next 12
months and are listed at Annex E.

In asset reporting an approach to linking individual assets to either timber bridges or concrete
structures has been undertaken. The graph below details the combined Condition Assessments for
both timber bridges and concrete structures which includes the five (5) concrete underpasses
included in concrete assets.




                          Conditions by Number of Assets
       25


       20


       15


       10


        5


        0
                            Concrete                                   Timber

                                             1   2   3   4   5


Figure 1: Condition by Number of Assets


The breakdown of replacement costs by asset condition is depicted in the graph below. The
importance of this graph is to identify the value of each asset condition and where future investments
are required to renew or rehabilitate the bridge assets. There are a number of bridges that have
bridge components that are close to failure that impact the life of the bridge. On the rehabilitation or
renewal of the specific bridge component the overall bridge condition is expected to improve and the
condition rating will be adjusted within the asset management system (T1).

The timing of the renewal of these assets will be addressed in the asset renewal plan that is included
in this AMP and, will be reflected in Council’s 10 year Capital Works Program.




Asset Management Plan: Road Bridges                                                            Page 10