The native algae was identified by the Herbarium as a species of algae from the family Chara, which is naturally occurring and causes no damage nor threat to local wildlife.
Councillor Wendy Newman, Portfolio Chair for Pest Management said the algae poses no current threat, and has flourished after heavy rains in March which flushed nutrients into the Railway Dam.
"As the algae uses up nutrients in the water and as the weather cools off, the algae will slowly die off. Its presence in the Railway Dam is a good thing, as it is a local endemic native found in still water across many parts of the Maranoa."
Council thanks residents for their vigilance in reporting the plant.