Crushed Aggregate Base

There is nothing complicated about the basic idea behind trackout rock.

You have trucks and equipment leaving a dirt construction site. Their tires are carrying mud, dirt and loose material with them. If that material ends up all over the public road, you have a problem.

A properly built stabilized construction entrance gives those trucks a rough, durable rock surface to cross before they hit pavement. As the tires roll over the aggregate, much of the loose dirt and mud gets knocked free before the truck leaves the site.

That’s trackout rock.

But there is an important distinction here: trackout rock isn’t just whatever rock happens to be sitting around the yard.

Size matters. Gradation matters. The hardness of the material matters. And the way the entrance is constructed matters.

If you’ve got loaded trucks running in and out of a job all day, you need rock that will hold up to the traffic.

What Is Trackout?

Trackout is the dirt, mud and other material carried from a construction site onto a paved roadway by vehicle tires.

You’ve seen it before.

A truck comes off a dirt jobsite and leaves two brown tracks down the street. After enough trucks make the same trip, you’ve got dirt spread across the roadway.

Besides making a mess, sediment leaving a construction site can become a stormwater and compliance issue. That is why stabilized construction entrances are common on grading, utility, road and other large earthwork projects.

The idea is to deal with the dirt before the truck reaches the street.

Why Use Large Rock?

This is one of those applications where smaller isn’t necessarily better.

If you put down a layer of fine crushed material and run muddy tires across it, the surface can quickly start behaving like more dirt. Fine material can work its way into the mud, while tires may simply roll across the relatively smooth surface without shedding much material.

Larger angular aggregate creates a rougher running surface.

As tires roll across it, they flex and move over the irregular stone. That helps break loose material out of the tire treads.

The rock also needs enough strength to withstand repeated traffic without immediately crushing into fines.

That’s particularly important when the traffic isn’t a pickup truck and a couple of guys coming to work in the morning.

We’re talking about dump trucks.

Water trucks.

Loaders.

Concrete trucks.

Lowboys.

And other heavy equipment entering and leaving the site throughout the day.

The entrance has to take the abuse.

What Size Rock Is Used for Trackout?

There isn’t one universal rock size for every stabilized construction entrance. The plans, SWPPP requirements and applicable agency specifications should always control the material used on a particular project.

That last part matters.

If the project specifies a particular gradation or construction entrance detail, build what is specified.

Don’t substitute material because something else happens to be cheaper or already sitting in a stockpile.

For jobs where the contractor has some discretion, larger crushed rock is generally preferred over small aggregate because you want enough stone size and angularity to interact with the truck tires and remain functional under traffic.

The quarry should know what you’re trying to accomplish before loading the trucks.

“I need some rock” isn’t much of a material specification.

“I need rock for a stabilized construction entrance” is a much better start.

Angular Rock Matters

Rock shape is easy to overlook.

Rounded gravel behaves differently from crushed granite.

Think about a pile of marbles compared with a pile of broken pieces of stone. Rounded particles tend to roll and move against one another. Crushed aggregate has fractured faces and irregular edges that allow the material to interlock.

For a construction entrance, that rough angular character is useful.

You want a durable surface that stays put reasonably well under traffic while also creating enough irregularity to help clean tires.

Lynx Cat Mountain Quarry produces crushed granite in the High Desert for heavy construction applications. The quarry supplies aggregate for infrastructure, military, road and rail work in the Barstow, Fort Irwin and China Lake areas.

Depth Matters Too

Good rock can’t fix a badly constructed entrance.

Put a thin layer of stone over soft soil and then start running loaded trucks across it. What happens?

The rock starts disappearing.

It gets pushed into the underlying soil, rutted, displaced and contaminated with fines. Pretty soon you’re looking at dirt with some expensive rocks buried in it.

That’s why stabilized entrances are built as a system rather than simply dumping a load of rock at the gate.

The subgrade condition matters.

The specified entrance depth matters.

Geotextile may be required depending on the project design.

The entrance also needs sufficient length and width for the actual vehicles using it.

A construction entrance designed for pickup traffic is a different animal once end dumps start cycling through it all day.

Maintain the Entrance

Another mistake is treating trackout rock as a one-and-done installation.

It isn’t.

A construction entrance is a working part of the jobsite.

Mud accumulates.

Rock moves.

Ruts form.

Fine material fills voids.

Heavy traffic breaks material down.

If the entrance stops removing material from the tires, it isn’t doing its job anymore.

That may mean regrading it, adding fresh rock or otherwise maintaining the entrance throughout the project.

You also still need to deal with material that makes it onto the roadway. A construction entrance helps control trackout. It doesn’t make road maintenance unnecessary.

Don’t Order Rock Based on the Name Alone

This applies to almost everything we sell.

Know what the project requires.

If there is a specification, send it over.

If there is a gradation requirement, we need to know it.

If you’re bidding a job and trying to determine what material makes sense, talk to Lynx Cat quarry before you finalize the number.

The cost of getting the wrong material isn’t limited to the rock.

It’s trucking.

Equipment.

Labor.

Removal.

Replacement.

And potentially a crew sitting around while somebody figures out how quickly the correct material can get there.

That is an expensive way to save a phone call.

Need Trackout Rock in the High Desert?

Lynx Cat Mountain Quarry supplies hard granite aggregate for contractors throughout Barstow, Hinkley, Fort Irwin, China Lake and the surrounding High Desert.

Tell us what you’re building and what the job requires. If you’ve got a project specification, send it to us. We’ll help you get the right material lined up before the trucks start moving.

Call Lynx Cat Mountain Quarry at 760-760-5969 to talk rock, specs, tonnage and delivery.

Mojave Desert vs. Coastal Quarries

Let’s talk about something that doesn’t come up at parties: where your rock comes from. I know. Thrilling topic. But if you’re the person responsible for sourcing crushed rock for a highway job or some kind of major infrastructure project, this is genuinely the kind of decision that can make your life a lot easier or a lot harder, and most people don’t think about it until they’re already in trouble.

How Much Aggregate Does a Highway Project Actually Need?

Here’s the setup. You need a serious amount of aggregate. Not “fill a few potholes” amount. We’re talking about a project where the rock order alone probably has its own line item, its own timeline, and possibly its own dedicated parking spot for trucks. A single lane-mile of highway base can require upwards of 10,000 tons of aggregate depending on depth and soil conditions. Multiply that across a multi-phase project and you’re not shopping around for a good deal on a pallet of pavers. You’re looking for a quarry that can actually sustain that volume for the life of the job.

So now you’ve got a decision: do you go with a coastal quarry, because that’s just sort of where everybody defaults to, or do you look inland, out toward the Mojave? It’s a little like picking a contractor for a major remodel. You could go with the shop everyone in the area uses, because that’s comfortable and familiar, or you could find out the operation three towns over does the exact same work, has way more availability, and isn’t double-booked through next spring. Most people don’t even consider option two because they don’t know it exists.

Coastal Quarry Suppliers in SoCal: The Default Choice and Its Limits

Coastal quarries have their thing going for them. They’re closer to a lot of the population centers, closer to a lot of the projects, and there’s a comfort in that — like ordering the thing on the menu you already know you like. But here’s the catch: everybody else likes that thing too. Coastal supply gets stretched thin fast, especially when three different contractors all need a thousand tons of base rock in the same month. Suddenly your “reliable” supplier is reliably out of what you need.

This is the part nobody budgets for. It’s not that coastal suppliers are bad. It’s that popularity has a ceiling. When every contractor in a hundred-mile radius is drawing from the same handful of coastal operations, you’re not just buying rock, you’re buying a place in line. And lines get long right around the time everyone’s trying to hit their summer construction deadlines. There’s also the permitting and operational constraint angle — coastal and near-urban quarries face more regulatory pressure and neighbor complaints, which can limit their operating hours, expansion plans, and long-term capacity.

Crushed Rock from the Mojave: Why Inland Quarries Work Better for Big Jobs

The Mojave side of things — and specifically a quarry out in Barstow — works a little differently. You’re dealing with a high-volume operation that isn’t fighting off the entire coastline for the same pile of rock. And because it’s sitting right along the I-15 corridor with easy access to I-40, you’re not actually losing much on the transportation side either. It’s not like hauling material in from the middle of nowhere. It’s more like hauling material in from a place that happens to have fewer neighbors competing for the same truck.

There’s also something to be said for an operation that’s built around volume from the ground up. Highway and infrastructure work doesn’t really tolerate “we’ll get you the rest next week.” A desert quarry that’s set up to produce at scale tends to handle that kind of demand without blinking, mostly because it was built for exactly that kind of demand in the first place. These aren’t operations that stumbled into big orders — they’re built around them.

What DOT Contractors and Infrastructure Firms Should Ask Suppliers

For DOT-level work or any big infrastructure build, the question isn’t just price per ton. It’s: can the quarry produce at the volume your project needs, and can it get there without your schedule falling apart. A desert quarry built for scale tends to win that comparison more often than people expect, mostly because nobody’s marketing it that way. It’s not glamorous. It’s not “ocean views and a tasting room.” It’s a quarry that produces a lot of rock and sits on a good road.

When you’re putting together a bid or sourcing plan, ask suppliers directly about sustained capacity across multi-phase timelines, not just what they can pull together for your first order. Ask about their experience with DOT spec materials specifically, since not every quarry produces aggregate that meets CalTrans or federal highway standards without extra processing. And ask what happens if your timeline slips — can they hold your allocation, or does it go to the next contractor in line.

A supplier that can quote you a great rate but can’t hold supply for the full duration of a long project isn’t saving you money. It’s just delaying the problem to a worse time, usually right when you’re trying to close out a phase and your next crew is already on site.

Finding the Right Crushed Rock Supplier for Your Southern California Highway Project

So if you’re comparing sourcing options for a highway project or anything infrastructure-sized in SoCal, it’s worth running the numbers on an inland Mojave supplier instead of just defaulting to the coast. The I-15 corridor makes Barstow closer than it feels on paper, the supply runs deeper, and an operation built for volume is going to handle your job differently than one that usually serves smaller contractors and has to scale up to meet you.

Sometimes the better option isn’t the one closest to the water. It’s the one that can actually keep up with you.

Ready to talk tonnage? Call Lynx Cat Mountain Quarry at 760-760-5969 and let’s figure out what your project needs.

A Contractor’s Guide

If you’ve ever priced out a project and stared at a materials list wondering whether to spec 3/8 or 3/4 crushed rock — you’re not alone. It’s one of the most common calls we get at the quarry, and it’s worth getting right before the trucks roll.

Here’s a practical breakdown of what 3/4 crushed rock is, where it earns its keep, and where a different product might serve you better.

What Is 3/4 Crushed Rock?

Three-quarter crushed rock — sometimes called 3/4-inch aggregate or 3/4 crushed stone — is angular crushed granite that has been screened to pass through a 3/4-inch opening. Unlike gravel, which is rounded and smooth from natural weathering, crushed rock has sharp, irregular edges. That angularity matters more than most people realize.

When you compact angular crushed rock, those jagged edges lock together. The result is a stable, interlocking matrix that resists shifting under load. That’s the mechanical advantage you’re paying for.

The Most Common Uses for 3/4 Crushed Rock

Drainage applications are where 3/4 crushed rock really shines. The particle size creates enough void space between stones to allow water to move through freely, which is exactly what you need under French drains, around utility trenches, behind retaining walls, and beneath permeable hardscapes. If drainage is part of your design problem, 3/4 is usually the right answer.

Base layers for heavy-load areas — parking lots, equipment yards, unpaved industrial surfaces — benefit from 3/4 as a structural fill beneath the finished surface or Class II base layer. The size handles compaction loads well and doesn’t punch through soft subgrade the way finer material sometimes can.

Pipe bedding and trench backfill often call for 3/4 crushed rock specifically because it cushions the pipe, doesn’t shift during settling, and provides positive drainage around the pipe zone. Many Caltrans and municipal specs will call out this size by name.

Erosion control on slopes and channels where rip rap is overkill but finer material would wash out — 3/4 crushed rock can function as a cost-effective armor layer for moderate flow velocities and shallow grades.

Concrete mix aggregate in certain structural and non-structural applications calls for 3/4 as the coarse aggregate component. It’s within the typical range for standard mix designs and provides good bond strength with cement paste.

When 3/4 Is Not the Right Call

Foot traffic surfaces and pathways — 3/4 is uncomfortable underfoot and tends to scatter. If someone’s walking on it, you want decomposed granite or crusher fines (often called 3/8 minus or stone dust), which compact to a firm, walkable surface.

Under pavers or flagstone — the void space that makes 3/4 great for drainage makes it a poor bedding material for anything requiring a flat, stable setting plane. Use Class II base or a clean concrete sand for that application.

Fine grading or tight utility work — the particle size can make precise grading difficult. Switch to a smaller aggregate or crusher fines where accuracy matters more than drainage.

3/4 vs. 3/8: The Practical Difference

The question usually comes down to drainage needs versus surface finish. Three-eighths crushed rock compacts tighter, has less void space, and gives a smoother surface texture — good for driveways, pathways, and thinner base applications. Three-quarters drains better, handles heavier loads, and is the go-to for underground or structural drainage situations.

When in doubt: if water management is part of the design, spec 3/4. If surface appearance or compaction density is the priority, consider 3/8 or Class II base.

Estimating How Much You Need

A rough rule of thumb for coverage at a 4-inch depth: one ton of 3/4 crushed rock covers approximately 65–70 square feet. For a 6-inch depth, plan on roughly 45–50 square feet per ton. These numbers will vary slightly depending on your compaction rate and the density of the specific granite you’re sourcing.

If you’re bidding a project in the high desert — Barstow, Fort Irwin, China Lake, the Mojave corridor — give us the square footage and target depth and we’ll get you a quote the same day.

Where to Get 3/4 Crushed Rock in Southern California

Not all crushed rock is equal. Granite from the high desert tends to be exceptionally hard and clean — low absorption, high durability, and it holds up well under the temperature swings the desert throws at it. That hardness matters for load-bearing applications where softer aggregate can break down over time under traffic and freeze-thaw cycles.

Lynx Cat Mountain Quarry produces 3/4 crushed granite near Barstow and supplies contractors throughout the Southern California high desert. We stock it, we haul it, and our people actually answer the phone on bid day.

Call us at 760-760-5969 or email quotes@lcmquarry.com to get a quote for your next project.

How Much Do You Need and How Do You Spec It Right?

Class II Aggregate Base is one of the most ordered products at any quarry serving construction in California — and also one of the most frequently under-specified on smaller projects. Get the compaction rate wrong, or order short, and you’re looking at a second delivery and a delayed pour.

This article covers the practical side of working with Class II base: what it is, how to estimate quantity, what compaction to expect, and when it’s the right product versus when something else would serve you better.

What Is Class II Base?

Class II Aggregate Base (also called CAB or Class II AB) is a crushed aggregate that conforms to Caltrans Standard Specification Section 26. In plain terms: it’s a well-graded crushed rock blend — typically 3/4-inch minus — that includes a controlled percentage of fines. Those fines are what give Class II its compaction behavior. When properly moisture-conditioned and compacted, the fine particles fill the voids between larger pieces and the whole mass densifies into a stable, load-bearing layer.

This is what goes under roads, driveways, parking lots, building slabs, concrete flatwork, and most other paved or semi-paved surfaces in California. It’s a Caltrans-compliant product, which matters on public projects and on private jobs where an inspector is involved.

How Much Class II Base Do You Need?

The standard formula:

Tons needed = (Length × Width × Depth in feet × Unit weight) ÷ 2,000

For Class II granite aggregate, the typical compacted unit weight is around 130–135 lbs per cubic foot. However, you’re ordering in loose volume and it will compact down — typically 15–20% compaction factor depending on your lift thickness and equipment.

As a practical rule of thumb:

• At a 4-inch compacted depth: approximately 55–60 square feet per ton
• At a 6-inch compacted depth: approximately 36–40 square feet per ton
• At a 8-inch compacted depth: approximately 27–30 square feet per ton

Always add 10–15% overage to your order. Subgrade irregularities, edge waste, and the difference between loose and compacted volume will eat into your numbers faster than expected, especially on larger pads.

Example: A 10,000 sq ft parking lot at 6-inch compacted Class II base needs roughly 250–280 tons before overage. Call it 300 tons to be safe.

Compaction Requirements

Caltrans specifies 95% relative compaction for Class II base under most roadway applications. For private projects, your project engineer may call out 90% or 95% depending on the loading scenario.

A few practical notes on hitting those numbers:

Moisture content matters. Class II compacts best near its optimum moisture content — typically 6–9% for most granite-based material. Too dry and you won’t get density; too wet and you’ll get pumping under the roller. If you’re working in the high desert in summer, you may need to water the material on the grade before compacting.

Lift thickness. Standard practice is compacting in 4-inch lifts maximum for most vibratory plate or drum roller equipment. Thicker lifts can leave uncompacted zones at depth that won’t show up on a nuclear gauge test until the slab starts settling.

Subgrade prep first. Class II base is only as good as what’s under it. A soft or non-uniform subgrade will undermine your compaction results regardless of how well you work the base. Scarify, moisture condition, and proof-roll the native material before placing.

When Class II Base Is the Right Product

Class II is appropriate when you’re paving — concrete or asphalt — and need a Caltrans-spec base, when your project requires a compaction test and documentation, when you need a product that will support significant dead and live loads over time, or when the design calls for a uniform, stable platform such as slabs, footings, or flatwork.

When to Consider Something Else

Open-graded base is used when drainage through the base layer is a design requirement — under permeable pavers, for example, or in areas with poor native drainage. It sacrifices some load-bearing capacity for drainage performance. Class II is not a drainage product.

Native subgrade with geotextile is sometimes used on very large, lightly-loaded areas like unpaved storage yards where full Class II depth would be cost-prohibitive. Not a substitute for structural applications.

Crusher fines / decomposed granite works for pathways and light-duty surfaces but won’t perform under vehicular loads.

Class II Base in the High Desert

Lynx Cat Mountain Quarry produces Caltrans-compliant Class II Aggregate Base from hard granite near Barstow. We can provide gradation certifications and material submittals for jobs that require them — which matters on military, municipal, and DOT projects in the Barstow, Fort Irwin, and China Lake corridor.

We haul throughout the Southern California high desert. If you’re putting together a bid or need a quick quantity check, call our team directly.

760-760-5969 | quotes@lcmquarry.com

Here’s What You Actually Need to Know

There’s something uniquely Barstow about needing a mountain of crushed rock before lunch.

Maybe it’s the way this stretch of the High Desert builds things—quietly, without fanfare, but always moving. But if you’re looking for an aggregate supplier near Barstow you’re probably not here for poetry. You’re building something. Something big. A road. A railbed. A military-grade landing pad, maybe.

Something that’s supposed to last.

And what you need isn’t just any rock. You need material that will hold up in this heat, on this land, under this pressure.

That’s where we come in.

Aggregate Supplier Near Barstow

The ground out here isn’t gentle. Between the thermal expansion from 110-degree summers and the unpredictable flash floods that roll in like they’re late to a meeting, your materials need to be more than good. They need to be right.

That’s why local sourcing matters more than you think.

• Aggregate that’s native to the Barstow region performs better under local stressors.
• Crushed granite from High Desert quarries has already proven it can withstand this terrain—because it came from it.
• Plus, reduced haul time means fewer delivery delays, lower carbon impact, and real cost savings for your project.

What You Should Look for in a Local Aggregate Supplier Near Barstow

Let’s get into the practical stuff. Because this isn’t your first RFP.

Here’s what actually matters when choosing an aggregate supplier in Barstow:

• Proximity to site – Saves money. Saves time. Reduces wear on roads.
• State and federal compliance – SMARA permits, ASTM standards, military spec compatibility.
• Material availability – Class II base, drain rock, ballast, rip rap, screened sand—and enough of it.
• Equipment and logistics – Can they load efficiently? Can they deliver? Can they scale?

If a supplier can’t do all of that consistently, you’re going to feel it halfway through the project.

What We Offer at Lynx Cat Mountain Quarry

We supply the High Desert, and we mean that literally. Located just northwest of Barstow in Hinkley, our quarry produces:

• ¾” and 1” Class II base
• Drain rock and rip rap
• Screened fill dirt and sand (SE 30+ and SE 50+)
• Railroad ballast for UPRR and BNSF
• Military spec materials for nearby installations

Our material is tested and tough, and we’re proud to meet the demands of Caltrans, county municipalities, infrastructure firms, and contractors who are tired of excuses and just need the job done.

Why Work With a Local Quarry Instead of a Big Corporate Supplier?

Because we’re not two time zones away.

We don’t have to check with corporate. We answer our phones, we know the specs by heart, and we’ve probably already delivered rock to your job site’s neighbor. Our trucks run the same roads you do. Our rock is the road in a lot of cases.

And honestly? We just really like what we do.

Ready to Order?

If you’re building near Barstow and need reliable, tested aggregate—call us. No runaround. No delays. Just quality rock, expert handling, and local people who know what it means to deliver in the High Desert.

Contact Us to get a quote or talk specs.