Excavation
Dirt Hauling in Tualatin, Oregon
Cojo
July 9, 2026
6 min read
Dirt hauling in Tualatin means moving excess soil off a jobsite -- or bringing clean fill in -- across a low-lying stretch of the Tualatin Valley where the Tualatin River, floodplain ground, and heavy clay define the work. Whether you are prepping a lot in an established neighborhood, adding onto a home, or grading a commercial pad, the spoil has to be loaded, hauled, and disposed of properly, and floodplain rules can shape what you do near the river. This guide covers how dirt hauling in Tualatin works and what it costs.
Tualatin sits along the Tualatin River south of Beaverton, and its low, wet ground affects every haul:
The soil, elevation, and lot on your specific site decide truck sizing and trip count. A cubic yard of dry clay is heavy enough; the same yard soaked through in January can weigh a third more, which means fewer yards per truck and more trips to stay under legal axle weights. That single fact drives a lot of what a Tualatin haul costs. The master excavation guide covers the earthwork; this page focuses on moving the dirt.
Tualatin Valley clay is the kind of soil that behaves like two different materials depending on the season. In the dry months it cuts firm and loads clean. Once the winter rain saturates it, it turns sticky and heavy -- it clings to the excavator bucket, smears across the truck bed, and tracks out onto the road on every tire. A high water table on the low ground near the river makes this worse, because water seeps into an open cut and turns the bottom of the dig to soup.
That is why the roughly May-through-October dry-season window matters so much here. Hauling in summer means firmer material, lighter loads, and fewer complications. Wet-season hauling is still possible, but it is slower, needs more truck trips per yard, and often needs dewatering -- pumping standing water out of the excavation before the machine can work the bottom. Plan the season and the ground works with you instead of against you.
Excess soil must be disposed of responsibly. Typical paths:
Most residential Tualatin spoil is clean clay, but commercial and older sites can carry contamination worth testing before hauling to a clean-fill site. Clean fill and contaminated soil are two different problems: clean clay goes to a recycling yard cheaply, while soil flagged as contaminated has to go to a permitted disposal facility at a much higher rate. A quick review of a site's history -- old fuel tanks, prior industrial use, fill of unknown origin -- tells you which path you are on before the trucks roll.
Two things happen before dirt moves. First, call 811 for utility locates -- Oregon law requires marking existing lines before you dig, and a strike on a gas or fiber line is a serious, expensive event. Second, confirm the floodplain status of the lot. Near the river, floodplain rules can limit how much fill you place, because fill in a floodplain displaces floodwater and can push it onto a neighbor.
A few points worth knowing for Tualatin dirt work:
Many Tualatin jobs move dirt both ways -- export the spoil, then import clean structural fill or gravel for the pad. Near the river, floodplain rules can restrict how much fill you add, because fill in a floodplain displaces floodwater. That makes balancing cut and fill on site especially important here.
Hauling is priced by the load or hour, plus disposal fees. These are planning baselines.
| Item | Baseline Range |
|---|---|
| Dump truck haul-off, per load (10-14 cu yd) | $250 -- $750+ per load |
| Dump / disposal fee, per load | $75 -- $300+ per load |
| Excavator + operator, hourly (loading) | $150 -- $350+ per hour |
| Fill dirt, delivered, per cu yd | $20 -- $75+ per cu yd |
| Crushed gravel, delivered, per cu yd | $45 -- $110+ per cu yd |
| Mobilization fee | $250 -- $800+ flat |
Baseline numbers are a planning floor, not a promise. On a wet Tualatin lot with saturated clay, a high water table, and dewatering, real costs often run two to three times the baseline once extra truck trips, disposal, and pump time stack up. Floodplain review, a contaminated-soil finding, or tight access can each move the number again. Wet clay hauls heavy, and floodplain rules add planning -- so a Tualatin quote depends on the specific job. Hauling often ties into broader Tualatin site prep.
A clean Tualatin haul day follows a predictable rhythm. The crew confirms 811 marks are still visible, sets a rock construction entrance so clay mud does not track onto city streets, and stages the excavator where it can load trucks without blocking the road. Then it is a loading-and-hauling cycle: load a truck, send it to the disposal or fill site, keep the machine working while it is gone. On a floodplain lot the crew watches for standing water and runs a pump if the cut starts to fill. Keeping the street clean is not optional -- Washington County and the city expect mud tracked off a site to be swept up, and a rock entrance is the cheapest way to avoid the problem.
Dirt hauling in Tualatin comes down to low, wet clay ground, floodplain rules, and timing. Balance cut and fill, confirm floodplain limits before importing fill, and work the dry season where you can. Cojo is a CCB licensed and insured Oregon excavation contractor, Hood River based and serving the Portland metro and statewide. See our excavation services or request a free estimate.
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