After being abandoned for 20 years the mill and dam had deteriorated badly. Between 1997 and 1999 generous donations from individuals and The South Nation Conservation Authority assisted to rebuilt the dam, complete major masonry and timber restoration and install a new roof.
In 2001 the exterior of the mill took a step back in time to the early 1900s when the loading dock was replicated by Algonquin College students.
Since 1999 the park has been maintained by volunteers. The addition of washrooms and an easy access ramp were made possible by a grant from the Ontario Trillium Foundation.
In 2006 the main level interior of the Mill received a new look with the addition of the entrance wall, which clearly displays the purpose of the Spencerville Mill Foundation and creates a natural flow through the exhibits on the main level.
Restoration of the turbine, development of the first exhibits in the lower level, and construction of a pavilion in the park were completed in 2007. These projects were completed through the assistance of private donations, the Spencerville & District Winter Festival, Brockville Community Foundation, a generous community and volunteers. Also completed in 2007 was the installation of new window panes and the addition of the unique handcrafted arbour in the Mill Park.
In 2015, the Mill Foundation Board, local politicians and volunteers celebrated the completion of the upper level. It is now available for events and public rental.