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

4.6    Asset Renewals
The purpose of developing a renewal plan is to identify assets that need to be replaced to maintain
the current level of service. Asset failure due to lack of renewal will affect the capacity to deliver
future renewals of bridges and subsequently the service bridges provide to the Noosa Community.

Bridge asset renewals are condition based. Recent condition assessments has provided staff the
ability to develop a Capital Renewal Program (Annex D lists the current bridges in the 10 year
renewal program by asset and year). Bridge assets have an estimated useful life of up to 100 years,
it is difficult to forecast the renewal beyond a 20 year period, even with good asset condition
knowledge.

There are still more bridges to be considered in future renewal plans. However, until all the bridges
that require level 3 inspections are completed further development and prioritisation of the renewal
program will be carried out. The individual asset components of the bridge assets are yet to be
componentised consistently within the T1 asset system. The ongoing asset management maturity
and development of the condition assessments and subsequent maintenance and renewal plans
relies heavily on the componentisation of all bridge assets.

Renewal expenditure is work which does not increase the bridges design capacity but restores,
rehabilitates, replaces or renews an existing asset to its original service capacity. Improved condition
assessment data capture is currently being developed to include asset renewal considerations based
on physical conditions and estimates of remaining useful life of assets to guide and improve renewal
programs.

Renewal plans are developed to maintain levels of service to ensure assets achieve their optimal
useful life before they reach the asset condition range of 5. A renewal program is defined in Annex
D and only has bridges that have been identified through the level 3 inspections for renewal. Further
development of the renewal program is required to identify the bridges in need of renewal over the
next 10 years and beyond.

The safety and condition of structures on Council’s road network is critical to the linkage of Noosa’s
communities. The trunk road network in the coastal areas is sensitive at peak periods and the failure
or part closure of any of those bridge assets will result in a reduction of the levels of service on the
community.

The graph below depicts the planned renewals by asset class over the next 10 years. There are
major renewals in 2018/19 for the Old Noosa Road Timber Bridge and Mary River Road Bridge
planning activities on Witta Circle Bridge and Doonella Bridge for future renewals. Other bridges to
be assessed for renewal works include the Orealla Bridge and Cooroy Mountain Road Bridge.

As the bridge assets age, continued CAs are required to monitor the assets and adjust more defined
renewal plans. The graph below enables Council to identify and plan for these significant renewal
activities in the shorter term. Further condition assessments will assist in developing a more robust
and defined 10-year renewal program.

Furthermore, the graph below also identifies the cumulative costs and future investment required in
renewing bridges over a 10-year period. The current renewals are identified in Annex D and are
reflective in Council’s 10 year Capital Works Program on the adoption of this AMP.




Asset Management Plan: Road Bridges                                                            Page 13