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A gravel driveway quote is easy to shop by price per ton of rock. The problem is that the rock is not what makes a driveway last — the base underneath it is. Two quotes can differ by thousands of dollars on the same job, and the cheaper one is usually cheaper because the base work is thinner.
A gravel driveway quote is easy to compare by price per ton of rock. The problem is that the rock is not what makes a driveway last — the base underneath it is. Most quotes that come in cheap are cheap because they skip or thin out the base work. That gap shows up as ruts after the first wet winter, and then you're spending money all over again.
Installed cost for a properly built gravel driveway in the Beaverton area typically runs $8 to $18 per square foot, depending on site conditions. A standard 12-foot-wide, 60-foot-long driveway — 720 square feet — lands somewhere between $5,800 and $13,000. The spread is almost entirely in base preparation, not rock price. Beaverton Excavation Co. prices every job after looking at the existing ground, because what is under the surface determines how much work the base needs.
If two quotes are far apart, ask each contractor to itemize: excavation depth, whether they're installing geotextile fabric, and how many lifts of base rock. That comparison tells you what you're actually buying.
The base is the single biggest cost variable, and the most important one. A proper gravel driveway starts with excavating the existing material — typically 8 to 14 inches on firm ground, deeper on soft or organic soil. That excavated material has to go somewhere, which adds hauling cost. Then the subgrade is compacted before anything else goes on top.
On weak or wet subgrade, geotextile fabric goes down before base rock. The fabric keeps the aggregate separated from the native soil below. Without it, the crushed rock slowly works its way into the clay over time and disappears — the driveway seems to eat rock, and you keep adding more every few years without understanding why. The fabric is not an upsell; on soft ground it is what makes the base hold.
Base rock goes in compacted lifts, typically 4 inches at a time, not dumped all at once. Dumping 12 inches of rock and running a plate compactor over the top does not compact the bottom layers — the load just squishes the soft material below. Lifts let each layer bond and carry weight before the next one goes on. It takes more time, which is why it costs more.
A flat driveway ruts. Water needs somewhere to go, and if the surface is level, it sits. A properly built driveway is either crowned — higher in the center so water runs to both edges — or cross-sloped, running about 2% to either side. On ground that is genuinely flat, this shape has to be deliberately graded in. On sloped sites, the slope often handles drainage naturally, but the cross-fall still needs to be controlled so water doesn't track down the center.
Crowning adds time to a gravel driveway job because it requires careful grading rather than just spreading rock. But it's what keeps the surface from developing ruts through the center where tires track.
Angular crushed rock — what is often called "minus" — has fractured edges that lock together under tire pressure. Rounded river rock or pea gravel does not bind; it rolls under load and migrates to the edges. For a driveway, angular crushed rock is correct. Three-quarter-inch crushed minus is common for surface layers. A clean crushed rock without fines drains better but provides less binding; minus, which includes fine material, packs tighter but can get muddy in wet years. Most driveways benefit from a clean base layer with a minus top.
Long driveways from the road to the material drop-off point increase haul cycles, which increases cost. Tight gates, overhead clearance from trees, and soft ground that risks getting equipment stuck all affect how the job is run. A driveway through an open flat field is faster to build than a winding path through trees. Get the quote after someone has seen the site.
The valley floor around Beaverton sits on Tualatin Valley silty clay, and that soil is the reason base work matters more here than in many other parts of the country. Clay holds water instead of draining it. When it is saturated — which in Washington County runs from October through May most years — it loses most of its bearing capacity and becomes plastic. A vehicle that crosses it repeatedly in that state leaves ruts that freeze into permanent ridges as the ground dries out in summer.
A quote that just dumps crushed rock on existing grade costs less because it skips excavation, haul, fabric, and compacted lifts. On Tualatin Valley clay, that kind of driveway may look fine in August. After one wet season with normal vehicle traffic, the surface rock has punched into the clay and the ruts are deep enough to scrape a car's frame. You end up spending more fixing it than you saved on the original quote.
In some parts of Washington County, basalt is present a few feet below the surface. Hitting rock changes both excavation method and cost — you need a machine equipped to break it, and the job takes longer. A site visit before pricing is the only way to know whether rock is a factor.
The October-through-May wet season also constrains when a driveway job can actually be done well. Installing base material on saturated clay is counterproductive — you're trying to compact material on top of ground that will not support the equipment. Work scheduled for late spring or summer, after the water table drops and the clay firms up, gets a better result from the same materials.
Concrete driveways typically cost $8 to $15 per square foot installed, versus $8 to $18 for gravel with a proper base — so the ranges overlap significantly. That overlap surprises people who assume gravel is always cheaper. The difference is maintenance over time.
For a short suburban driveway — 40 to 80 feet from the street to the garage — concrete is genuinely the better long-term choice for most homeowners. It does not rut. It does not need topping every two or three years. It holds its grade and sheds water predictably once it's placed. The upfront cost is higher, but the ongoing cost over 20 years is lower. A 60-foot concrete driveway is a finite investment; a gravel one is an ongoing maintenance item.
Gravel wins on long rural driveways — 200 feet or more — where the concrete cost becomes very large and repairs are far cheaper. If you break a section of concrete, repair requires saw-cutting the slab, removing the broken section, and placing new concrete. If a section of gravel ruts, you haul in a few tons of crushed rock and regrade. Gravel also handles heavy equipment better — a loaded concrete truck or a loaded dump truck will sometimes crack residential concrete flatwork, while gravel can be regraded after.
Gravel is also the right answer when the driveway alignment may change — when you're still developing the property and the final layout isn't set. Placing concrete commits you to that path. Gravel is the flexible option when you're still figuring out where buildings and structures will end up.
A well-built gravel driveway on a proper base needs surface rock added every two to four years, depending on traffic. Expect to haul in half an inch to an inch of crushed rock and regrade it to maintain crown. That work typically costs $300 to $700 for a standard residential driveway, depending on whether you rent a blade attachment or hire it out.
Regrading ruts in spring is normal even on a good base — the combination of frost heave and wet-season traffic moves surface rock around. A simple pass with a box blade in April or May keeps the surface in shape. This is maintenance, not a sign something is wrong.
If you're adding rock every year and still seeing deep ruts, the problem is not the surface rock — it's the base. Adding more rock on a failed base is like painting over rot. The fix at that point is to strip the surface, address the subgrade, install fabric if it's not there, and rebuild. That work is more expensive than doing it right the first time, but it's the only thing that actually solves the problem.
Good grading and leveling of the existing surface before adding fresh rock is part of proper maintenance. Grading ruts flat before topping ensures the new rock has uniform thickness and the crown is maintained.
For a new driveway, get quotes after the contractor has seen the site. The variables that drive cost — soil type, existing grade, excavation depth, haul distance, whether fabric is needed — can't be estimated from satellite imagery or a phone conversation. A quote given without a site visit is a guess, and it usually doesn't account for the problems that drive cost on your specific property.
If your existing gravel driveway ruts every winter despite regular topping, the base needs attention, not more surface rock. A contractor can probe the existing base depth and assess whether it's a drainage problem, a base thickness problem, or a subgrade problem. Each has a different fix.
If you're building new construction and the driveway needs to handle concrete trucks and other heavy equipment, size the base for that load from the start. A base built for passenger cars will fail under construction traffic, and rebuilding it after the fact is far more expensive than building it right once.
A 500-foot driveway at 12 feet wide is 6,000 square feet. At $8 to $18 per square foot installed — which includes excavation, base rock, geotextile fabric, and surface rock — that is $48,000 to $108,000. The wide range reflects base conditions: soft or organic soil that needs deep excavation costs significantly more than firm ground that needs only a standard base.
A 1,000-foot driveway at 12 feet wide and 4 inches of surface rock needs roughly 150 tons of surface material. The base layers require more — plan for 200 to 350 additional tons of crushed base rock, depending on base depth. Base and surface material combined for a 12,000-square-foot driveway typically runs 350 to 500 tons total, including base lifts.
Gravel typically costs less upfront, but the comparison depends on length. For short driveways under 80 feet, concrete's higher upfront cost is often offset by much lower maintenance — no re-topping, no annual regrading. For driveways over 200 feet, gravel wins on total cost because repair is far cheaper than patching concrete. For driveways in between, the honest answer is that it depends on how much traffic and vehicle weight the surface will see.
A standard tandem dump truck carries 14 to 18 tons of crushed rock. Delivered cost for crushed base rock typically runs $350 to $600 per load depending on source and distance. Surface rock (crushed minus or clean three-quarter inch) may cost slightly more. Material cost is only part of installed price — spreading, grading, and compacting the rock adds labor on top.
On firm, well-drained soil, 8 to 10 inches of compacted base material is the minimum. On Tualatin Valley clay or any soft, wet subgrade, 12 to 16 inches is more appropriate, and geotextile fabric under the base is important to keep rock from working into the clay. Depth is the difference between a base that holds for 15 years and one that ruts within two.
On clay soil — which describes most of the Tualatin Valley floor — yes. Without fabric, crushed rock gradually presses into clay over time as traffic loads it. The driveway slowly sinks and softens. Fabric creates a separation layer that keeps aggregate in place. It adds a few hundred dollars to the job and meaningfully extends how long the base performs without needing to be rebuilt.
Most of these questions have a general answer and a site-specific answer, and the site-specific one is the one that decides the cost. If you want a real number for your property, call (458) 272-9359 or send the details and we will walk the ground with you.