By the turn of the century, Aultsville had added three more general stores, three cheese factories, another garage, four service stations, and a bank to its list of businesses.
A grist mill in Aultsville was built around 1929.
The mill contained metal grinding plates which ran on an electric motor; the mill mostly ground the local farmers personal grain supplies.
In later years, the grist mill was used as an egg grading office.

The first cheese factory was known as Croil's and McCullough's factory, and was located near the train station; cheese made here was shipped as far away as Montreal.
Later this cheese factory became the Edward's Cheese Factory, and two more factories opened in the village both of which were also operated by the Edward family.
These cheese factories were powered by steam, using coal-fired boilers to heat cheese vats.
The cream for these factories was cooled and kept cool using a primitive cold-storage method; ice was cut during the winter months from the St. Lawrence River and insulated with sawdust.

After World War II the village began to decline, many businesses closed and industries ceased operations.
This was due to the fact roads in the area improved as had means of transportation; it was now feasible to travel to nearby communities for necessities.
Additionally, many of the pioneer industries which once sustained Aultsville were becoming obsolete.
By the mid-1950s, only one cheese factory, a bank, a general store and the schools remained in operation.
In 1958, the decision was finally made to construct the seaway, and the village was scheduled for demolition.
The trees were cut from the town and the buildings of Aultsville burned in a controlled fire to test the effects of fire on buildings.
Around July 1, 1958, Aultsville began to be flooded along with the other Lost Villages, the process taking around 4 days.
By the turn of the century, Aultsville had added three more general stores, three cheese factories, another garage, four service stations, and a bank to its list of businesses. A grist mill in Aultsville was built around 1929. The mill contained metal grinding plates which ran on an electric motor; the mill mostly ground the local farmers personal grain supplies. In later years, the grist mill was used as an egg grading office.
The first cheese factory was known as Croil's and McCullough's factory, and was located near the train station; cheese made here was shipped as far away as Montreal. Later this cheese factory became the Edward's Cheese Factory, and two more factories opened in the village both of which were also operated by the Edward family. These cheese factories were powered by steam, using coal-fired boilers to heat cheese vats. The cream for these factories was cooled and kept cool using a primitive cold-storage method; ice was cut during the winter months from the St. Lawrence River and insulated with sawdust.
After World War II the village began to decline, many businesses closed and industries ceased operations. This was due to the fact roads in the area improved as had means of transportation; it was now feasible to travel to nearby communities for necessities. Additionally, many of the pioneer industries which once sustained Aultsville were becoming obsolete. By the mid-1950s, only one cheese factory, a bank, a general store and the schools remained in operation. In 1958, the decision was finally made to construct the seaway, and the village was scheduled for demolition. The trees were cut from the town and the buildings of Aultsville burned in a controlled fire to test the effects of fire on buildings. Around July 1, 1958, Aultsville began to be flooded along with the other Lost Villages, the process taking around 4 days.
Aultsville, Ontario