Cressbrook Dam Safety Improvement Project
Overview
Cressbrook Dam is the Toowoomba Region's key source of drinking water, servicing over 180,000 residents. It was constructed in 1983 and is owned and operated by Toowoomba Regional Council. The dam is a 59 m high zoned earth fill dam with a 20.3 m uncontrolled (ungated) spillway.
The project's scope of works includes:
widening of the existing spillway to a width of approximately 35m:
• replacing the left-hand side training wall
• demolishing the existing right-hand side training wall
• constructing a new right-hand side training wall
• constructing a reinforced concrete spillway crest extension
• constructing a new chute slab over the existing chute slab section
• installing concrete lining of exposed rock to provide a hydraulically smooth surface
• removing the existing left-side chute wall
• constructing a new left-side chute wall
• upgrading the spillway chute floor to modern standards
• modifying the flip bucket
• off-site disposal of demolished concrete works
• extending the dam filters to the full height of the embankment up to crest level
• raising the dam crest earth embankment
• downstream berm modifications.
DELIVERY SCHEDULE
The project is currently in the detailed design phase and permanent works are scheduled to commence on site around Q3-Q4 2024. The forecast date for completion of the project is between Q4 2025 and Q1 2026.
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WORK PACKAGES
Contract - Full Scope Closes
Plant and Equipment Hire - 30 May 2025
General and Other Services - 31 May 2025
Professional Services and Consultants - 31 May 2025
Roadworks and Culvert Civil Works - 31 May 2025
Site Labour Support Services - 31 May 2025
Supply of Quarry Materials - 31 May 2025
Waste and Disposal Services - 31 May 2025
Labour Hire including Construction Trades and Trade Assistants - 31 Aug 2025
Quarrying Services including, Drill and Blast, Crushing and Screening - 25 Sep 2025
Supply of Construction Materials - 24 Dec 2025.