Aggregate Base Course
Class 6 Road Base
#200 to ¾ Inch · CDOT-Specification · Pit-Fresh · Stamped Soils Report Available
Retail Price
$19.50/ton
Contractor pricing — call (719) 686-1566
~90–100 sq ft/ton
Coverage at 3" compacted depth
What Is Class 6 Road Base?
If you're planning a new driveway, parking pad, or private road at your Colorado mountain property, Class 6 Road Base is almost certainly the material your contractor will specify — and for good reason. It's the most widely used gravel product in Colorado for any project where you need a firm, stable, and durable surface underfoot or beneath pavement.
It's a carefully blended mix of crushed rock in a range of sizes — from coarse ¾-inch pieces all the way down to fine particles smaller than a grain of sand. When it's compacted with a roller or plate compactor and the moisture content is right, those particles lock together into a dense, interlocking matrix that behaves almost like a solid surface. Water drains through it, heavy loads spread across it evenly, and Colorado's extreme freeze-thaw cycles don't heave it the way they do pure clay or soil.
The result? A surface that stays firm in spring mud season, doesn't wash out in afternoon thunderstorms, and gives you a clean, all-weather driving surface year after year — with very little maintenance required.
Where Is Class 6 Road Base Used?
Class 6 is the go-to material for a remarkably wide range of residential and commercial applications across Teller, Park, Fremont, Jefferson, Douglas, El Paso, and Pueblo County. Whether your project is a simple driveway or a full county road reconstruction, this material handles it.
- Residential Driveways — The single most popular use. Class 6 compacts into a firm, dust-minimized surface that handles daily traffic and holds its shape through Colorado's wet springs and freezing winters.
- Private Roads & Ranch Access Roads — Mountain properties often need quarter-mile or longer access roads. Class 6 provides the structural base that keeps vehicles moving even after heavy snow and melt cycles.
- Base Layer Under Asphalt or Concrete — Before any paving goes down, a properly compacted Class 6 base is required. It distributes load, prevents settlement, and gives the paved surface a stable foundation to bond to.
- Parking Areas — From RV pads to commercial lots, Class 6 creates a surface firm enough for heavy vehicles without the cost of asphalt or concrete.
- Construction Staging Areas — Contractors use Class 6 to create all-weather work surfaces on job sites, keeping equipment from sinking into native soil.
- Utility Trench Backfill — Where structural backfill is needed above underground utilities, compacted Class 6 is an approved and commonly used material.
- Sub-Base for Sheds, Garages & Outbuildings — A well-compacted Class 6 pad beneath a concrete slab dramatically reduces cracking and settling over time.
Class 6 Road Base — Residential Driveway, Teller County CO
How to Use Class 6 Road Base — Practical Tips
Getting the most out of Class 6 starts with proper installation. At a compacted depth of 4 inches, one ton covers roughly 90–100 square feet. For a standard residential driveway that's 12 feet wide and 200 feet long (2,400 sq ft), you'd need approximately 24–27 tons at 4-inch depth. Going to 6 inches — which we recommend for Colorado's clay-heavy soils and freeze-thaw conditions — increases that to 36–40 tons. Add 10% for waste and settling.
- 4 inches compacted — Minimum for light residential use on well-drained, stable native soil.
- 6 inches compacted — Recommended for most Colorado residential driveways, especially on clay or expansive soils.
- 8+ inches compacted — Required for heavy truck traffic, commercial applications, or soft subgrade conditions.
Pro Tip — Colorado Clay Soils
Teller and Park County soils often have a high clay content that swells when wet and shrinks when dry. On these sites, place a geotextile separation fabric between the native soil and your Class 6 base. This prevents the clay fines from migrating up into the aggregate over time — dramatically extending the life of your driveway at very low added cost.
Class 6 Road Base — Completed Residential Driveway, Colorado
Technical Specifications & Engineering Data
MCG's Class 6 meets CDOT Section 703 specifications. The material must pass the following sieve analysis, confirming that the particle size distribution meets Colorado Department of Transportation standard specifications for aggregate base course.
- Minimum R-Value — 78 (Colorado DOT requirement for base course material)
- Compaction Standard — ASTM D1557 Modified Proctor — minimum 95% of Maximum Dry Density
- Optimum Moisture — Typically 6–9% for this gradation; compact within ±2% of optimum
- Shale Content — Not more than 7.0% in total sample (CDOT Spec 3138)
- Fractured Faces — Not less than 60% of particles by weight must have ≥1 fractured face
Soils Report Available
MCG maintains a current stamped soils report for our Class 6 Road Base pit material. This report documents gradation, Atterberg limits, moisture-density relationships, and R-value testing. Call Dominic at (719) 374-0381 for engineering documentation.
| Sieve Size | Metric | % Passing |
|---|---|---|
| 1 inch | 25 mm | 100% |
| ¾ inch | 19 mm | 85–100% |
| ⅜ inch | 9.5 mm | 55–80% |
| No. 4 | 4.75 mm | 35–60% |
| No. 8 | 2.36 mm | 25–50% |
| No. 30 | 0.6 mm | 15–30% |
| No. 200 | 0.075 mm | 3–12% |
Class 6 Road Base — Pit-Fresh Aggregate, Mule Creek Gravel, Divide CO
Why Source Your Class 6 From Mule Creek Gravel?
- Pit-fresh material — No stockpile degradation. Our Class 6 is processed from our Divide pit and delivered direct to your project, maintaining consistent gradation and moisture content.
- CDOT-compliant — Our material meets or exceeds Colorado Department of Transportation specifications, making it acceptable for municipal, county, and state-regulated projects.
- Stamped soils report on file — Ready when your inspector or engineer asks for it. No delays waiting on lab testing.
- Three truck options — Tandem Dump, End Dump, and Belly Dump trucks available. The Belly Dump is ideal for road and driveway projects — it lays a smooth, consistent windrow that's easy to grade and compact.
- Contractor pricing available — Call for volume and contractor rates.
- Open year round — Monday–Friday 7am–4pm, Friday until noon. Colorado projects don't stop for weather, and neither do we.
Pit-Fresh Class 6 — Mule Creek Gravel, Divide CO 9,350 ft
Order Class 6 Road Base
Call Tess to place your order, confirm availability, and schedule delivery.