The grain elevator, known as Armour's Warehouse, was constructed in 1861–62 on the north bank of the Illinois-Michigan Canal in Seneca, Illinois.

[2] In total there are five separate buildings, including the grain elevator, on the site of Armour's Warehouse.

It is historically significant in a local context commercially and in attracting the railroad to Seneca.

On a broader level, it illustrates the economic importance of the Illinois-Michigan Canal for transporting grain products.

[1] Included in the listing as contributing properties were the 1892 office building and attached scale house, and the older of the two seed warehouses.