3A Modified Crushed Stone

3A Stone at Union Quarries


3A modified stone is ideal for construction projects in areas with deep fill requirements where compaction is a priority.

3A Stone Size


3A modified has a top rock size of 2 to 2.5 inches.


PennDOT 3A stone is an excellent grade for compacting to create a stable surface.

Uses for 3A Modified Stone


PennDOT requires gravel used for road construction to be durable, composed of at least 85% crushed particles, and possess two or more faces resulting from fracture. Here are some standard commercial and residential applications for material of this grade:


  • Heavy-duty sub-base for parking lots and roads.
  • Haul road surface.


If you’re planning on taking on any of these projects, 3A gravel might be the right material for you. Request a free quote from Union Quarries if you’re located in Central Pennsylvania.

What Is Crushed Stone?


Crushed stone is a sustainable resource that can be produced with nearly any type of hard stone. The most common types of rock used are traprock, argillite, granite, washed gravel, quartzite and limestone. At Union Quarries, we use limestone to produce 3A gravel and other grades of crushed stone.


Many varieties of crushed stone are used in various construction products, from base material for pavement to decorative use in areas for walking and driving. Grades of crushed stone are categorized by the size of the pieces generated during crushing. The size then impacts the best application for each grade of crushed stone.


PennDOT 3A stone is similar to 2A modified stone. However, 3A gravel features a slightly larger top rock size and a mixture of coarse stone and crushed stone dust. 3A stone is a relatively clean material that will compact and drain.

Where Can I Find 3A Gravel Near Me?


Union Quarries has been Central PA’s reliable provider of crushed stone for over half a century. We offer 3A gravel as part of a wide range of sizes of crushed stone to fit the needs of any commercial or residential construction project.


We provide materials to Cumberland County, York County, Perry County, Gettysburg and throughout the rest of Central PA.

Union Quarries Has the Crushed Stone You Need to Complete Any Construction Project


When you’re performing a landscaping or construction job, access to a reliable producer of stone, blacktop and concrete is essential to completing work on time. Union Quarries specializes in providing premium stone in the quantities our customers need to get their projects done right. Safety is always our top priority, and we deliver specialized products that aren’t available at any other PA quarry.


If you are still deciding which crushed stone grade is best suited for your commercial or residential project, reach out to Union Quarries today. Our staff is prepared to assist you, whether you’re a homeowner, contractor, developer or builder. Give us a call at (717) 249-5012 or get in touch with us online to talk about how we can set you up with the right selection of stone for your next project.