The long-awaited water sculpture is being built offsite through Waterforms International to ensure structural integrity of the large artwork before it is installed at the front of The Civic Centre.

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Gunnedah Shire Council's cultural precinct team leader Lauren Mackley said the construction schedule had been delayed by the challenges of social distancing and social isolation, but the water feature should be installed in its designated place in May.

"The story of the Rainbow Serpent, as told by the late Ellen Draper, is about restoring balance," Ms Mackley said.

"In times like this, the completion of this project is a symbolic restoration of balance and hope for our future."

The 9.2m long sculpture will feature 32 handcrafted mosaic tiles illustrating koalas, turtles, cockatoos, lizards, fish, Aboriginal tools, children's hands, and the Red Chief, among other images.

The original design of the rainbow serpent was developed by Glen Innes artist Max Powell and fellow artist Bronwyn McKean from drawings completed by Aboriginal leader Ellen Draper.

Shirley Long, Janet Wanless, Delma Jones, Ellen Draper, Gloria Foley, June Cox, Alison Cox, Rita Long and Cindy Foley became the core group of artists who met regularly for more than two years to create the glass mosaics that adorn the surface of the Rainbow Serpent art work.

"We are so happy with the progress so far. Waterforms International are doing a wonderful job and the serpent looks unbelievable," Janet Wanless said.

"We are so overwhelmed and excited the project is finally taking shape and coming to life. It has been a long journey."

After the feature is installed, utilities will needed to be connected and the area will need to be repaving. Work may be completed in June.

The project has been years in the making and is funded by the NSW Government Regional Cultural Fund and the council.