SLOW releases are continuing from Wivenhoe Dam before the start of operations to reduce the dam to 75% capacity.
A Water Grid spokesman said the controlled gate release to temporarily reduce the level of the dam was expected to commence later in the week.
While details and timings were yet to be finalised, it was expected it would run for nine days, taking advantage of the mild weather, tides and limited flows into the Brisbane River from other sources downstream.
Twin Bridges, Savages Crossing and Colleges Crossing were likely to be closed once the releases begin.
Mt Crosby Weir would be open as an alternative to Colleges Crossing throughout the process.
Somerset Dam is also releasing a minor flow through cone valves.
Lake Maroon remains closed to all water-based recreation due to water quality issues.
At Wivenhoe Dam, O'Shea's Crossing, the Spillway Lookout and Billies Bay/Hays Landing recreation areas remain closed until further notice.
All visitors should be wary of submerged hazards and take extreme caution. For the latest information, visit www.seqwater.com.au or call 1800 613 122.