How Much Shot Rock Do I Need for 1816 Cubic Yards

[MikePhua]

Quick answer
To cover 1816 cubic yards of shot rock (12–30 inch), you’ll need approximately 2,600 to 3,300 tons, depending on the rock type. Granite, basalt, and limestone vary significantly in density, so supplier-specific weight per yard is essential for accurate conversion.
Understanding shot rock and its density range
Shot rock refers to large, irregular chunks of blasted stone typically used for erosion control, riprap, or base stabilization. Sizes range from 12 to 30 inches, making it unsuitable for compaction but ideal for resisting hydraulic forces. Because it’s unprocessed, its density depends heavily on mineral composition and moisture content.
Typical densities:

• Granite: 2,800–3,200 lbs/cu yd (1.4–1.6 tons/cu yd)
  
• Limestone: 2,600–2,900 lbs/cu yd (1.3–1.45 tons/cu yd)
  
• Basalt: 3,000–3,300 lbs/cu yd (1.5–1.65 tons/cu yd)
  
• Sedimentary fieldstone: 2,200–2,500 lbs/cu yd (1.1–1.25 tons/cu yd)
  

These figures are averages. For precise estimates, always request the supplier’s certified weight per cubic yard for the specific material.
Calculating total tonnage for 1816 cubic yards
Using the density range above:

• Low estimate (limestone): 1816 × 1.3 = 2,360 tons
  
• Mid estimate (granite): 1816 × 1.5 = 2,724 tons
  
• High estimate (basalt): 1816 × 1.65 = 2,996 tons
  

If the supplier quotes 2,800 lbs/cu yd, the conversion is:

• 1816 × 2800 lbs = 5,084,800 lbs ÷ 2000 = 2,542.4 tons
  

Supplier-specific variation and regional sourcing
Rock density varies by quarry. For example:

• South Dakota fieldstone is light and porous, unsuitable for riprap
  
• Imported granite from 90 miles away may offer higher durability but increased transport cost
  
• Eastern limestone may be denser than western equivalents due to mineral content
  

Always ask your supplier:

• What is the weight per cubic yard of your shot rock?
  
• Is the material dry or moisture-laden?
  
• What is the source quarry and rock type?
  

Real-world example and bidding strategy
A contractor bidding a job for a state wildlife agency was told to supply 1816 cubic yards of shot rock. Without knowing the exact density, he risked underestimating transport and placement costs. After consulting the Cat Performance Handbook and local suppliers, he adjusted his bid to cover up to 3,000 tons, ensuring margin for density variation and fuel surcharges.
Recommendations for project planning

• Request supplier weight certificates before bidding
  
• Add 5–10% contingency for moisture, spillage, and grading loss
  
• Confirm truck payload limits: Most dump trucks carry 20–25 tons per load
  
• Coordinate with placement crew: Larger rock requires skilled operators and may need tracked equipment
  

Conclusion
To cover 1816 cubic yards of shot rock, expect to order between 2,400 and 3,000 tons, depending on the material. Always verify density with your supplier and build in contingency for transport and handling. Accurate conversion ensures your bid reflects real-world conditions and protects against costly overruns.