Aggregate Suppliers

The Custar Stone Company

The Bluffton Stone Company

West Millgrove Stone Company

Glacial Sand and Stone

Round Lake Sand and Gravel

Hillsdale Sand and Gravel

Asphalt Materials Supply

Contact Main Office

Plant Locations


High quality construction materials are available through a network of quarries and sand and gravel production facilities located throughout northwest Ohio and southeast Michigan and most materials are ODOT and MDOT certified.  

Limestone is produced from The Custar Stone Company, The West Millgrove Stone Company and The Bluffton Stone Company.  While natural sand and gravel materials are produced through the Hillsdale Sand and Gravel, Glacial Sand and Gravel, and Round Lake Sand and Gravel companies.  This diversity in material supply gives The Gerken Companies a competitive edge in meeting the customers’ aggregate needs and Gerken Materials’ asphalt material supply.

Quarry/Pit Locations

Gerken Materials, Inc.
9-072 CR 424
Napoleon, OH 43545
PH: 419.533.7701
Fax: 419.533.6393
Ohio Aggregate Sales
Michigan Aggregate Sales
9-072 CR 424
3660 East US 223
Napoleon, OH 43545
Adrian, MI 49268
PH: 419.533.7701
PH: 517.264.8002
Fax: 419.533.6393
Fax: 517.264.8006