A construction access road is the cheapest thing on the job until it fails. Then it is the most expensive, because everything stops. Whether you are reaching a tower location, a pad site, a well site or a back corner of a large development, a temporary road has one job: carry loaded trucks and heavy equipment in any weather without rutting or pumping. That comes down to subgrade preparation, the right base material at the right thickness, and drainage. This guide covers how to build one that holds up and how to estimate the rock.
Start with the subgrade, not the rock
Most failed access roads fail underneath. Rock placed on soft, wet or organic subgrade will punch down into it, and you end up hauling stone into a hole that keeps swallowing it. Strip vegetation and topsoil, proof roll to find soft spots, and either undercut and replace or stabilize them before you place base.
In Texas, expansive clay is the usual culprit. Clay that pumps under a loaded truck will keep pumping no matter how much rock sits on top, which is why separation and drainage matter as much as thickness.
Use a separation layer where the ground is soft
On soft subgrade, a geotextile separation fabric between the soil and the base is often what makes the difference. It keeps the stone from migrating down into the soil and the soil from pumping up into the stone, which preserves the load carrying capacity you paid for. On firm, well-drained subgrade you may not need it. On clay that has been wet, you almost certainly do.
Choosing the base material
For a temporary haul road, you want an angular, well-graded crushed material that locks together and sheds water. Crushed limestone base and crushed concrete base both work well and are common choices across Texas.
Angularity matters more here than on a finished pad because the surface takes repeated turning and braking loads. Rounded gravel moves under traffic. Well-graded crushed material with fines binds and stays put.
Thickness and width
Thickness depends on subgrade strength and the loads you are running. As a general planning range, a light-duty access road on firm subgrade may need only a modest section, while a haul road carrying loaded tandems and lowboys over weak subgrade can need substantially more, placed in compacted lifts rather than one deep dump.
Width should account for the widest equipment plus shoulder, and any turnouts or turnarounds you need. Do not forget the turnaround at the end. A truck that cannot turn around is a truck that backs a long way or damages the shoulder.
Drainage decides how long it lasts
Crown the road so water runs off rather than standing, and ditch the sides where the grade allows. Standing water at the edge of a haul road migrates under it and softens the subgrade you worked to prepare. Where the road crosses a drainage path, culvert it. Most access roads that fall apart in Texas fall apart after a wet week, not because the rock was wrong.
How to estimate the rock
Compute volume the same way you would a pad. Multiply length by width by compacted thickness in feet, divide by 27 for cubic yards, then convert to tons at roughly 1.9 to 2.1 tons per cubic yard for most crushed base. Add an allowance for compaction and for the material that works into the subgrade on the first passes, which is real and often underestimated.
Then plan for maintenance material. A haul road in continuous use needs periodic regrading and top-up rock. Budget for it rather than treating the first placement as the whole cost.
Getting it delivered
Give your supplier the road dimensions, the subgrade conditions, and the traffic it will carry, and confirm delivered cost per ton including haul. On remote corridor work, haul distance can exceed material cost, so the nearest qualified pit usually wins even at a higher pit price.
Most failed access roads fail underneath. Rock placed on soft subgrade disappears into it.
Call 214-282-7980 or request a quote at aggregatesnow.com.