Excavation work in 97230 covers the Gateway, Parkrose, and Argay neighborhoods between Interstate 205 and the Columbia Slough. This is mixed-use ground -- older single-family homes, mid-century commercial pads going through redevelopment, and a long industrial frontage along NE Sandy Boulevard. The excavation calls here split roughly between residential site prep for new accessory dwelling units, commercial pad work for retail and mixed-use redevelopment, and utility trenching for property upgrades.
What Makes 97230 Excavation Different
Two things matter on every 97230 site walk. First, the high groundwater near the Columbia Slough means many parcels south of NE Killingsworth and east of NE 102nd hit water within 6 to 10 feet of grade. That changes how you trench, how you shore, and whether you can put a basement in at all. Second, the soil column varies. Some lots are on alluvial fill from the Slough, some are on the original Portland Hills silt cap, and a few near the Sandy River escarpment have catastrophic-flood gravels just below grade. The right machine and the right haul plan depend on which one you have.
Add a layer of buried infrastructure -- decommissioned septic systems from before the area was sewered, older lead service lines, and undocumented private storm drains -- and 97230 excavation is rarely a clean dig. Locates are mandatory, hand-digging at every utility crossing is standard, and most jobs need a pre-construction sub-surface scan if a basement or significant footing is involved.
What Cojo Handles in 97230
Our 97230 excavation scope covers:
- Single-family home site prep (footings, basement excavation, ADU pad, garage slab subbase).
- Driveway and parking pad excavation, including tear-out of existing failed asphalt and base.
- Utility trenching for new sewer laterals, water service replacements, gas line installs, and electrical conduit runs.
- Stormwater work -- catch basin installs, infiltration trenches, drywell pits where they are still allowable under BES rules.
- Backyard regrade for drainage, retaining wall footings, and pool subbase.
- Commercial pad prep for ground-floor retail and mixed-use new construction.
We do not do deep-foundation work over 10 feet -- a structural excavator with shoring expertise is the right call for that. For everything else, 97230 sites are inside our standard route.
Cost Discipline: What Real 97230 Excavation Runs
Excavation pricing is the most variable scope inside the paving and site-prep family. Two identical-looking residential pads can have radically different costs if one hits groundwater at 6 feet and the other does not. The industry baseline below is a planning frame, not a quote.
Industry Baseline Range
| Scope | Typical Cost |
|---|---|
| Residential pad (small ADU or garage) | $5,000 to $18,000+ |
| Basement excavation (residential, with shoring) | $20,000 to $80,000+ |
| Driveway excavation (tear-out and rebase, 800 to 2,000 sq ft) | $4,000 to $20,000+ |
| Utility trenching (per linear foot, 4 to 6 feet deep) | $25 to $75 |
| Stormwater drywell or infiltration trench | $3,500 to $15,000+ |
| Backyard regrade for drainage (per sq ft) | $3 to $9 |
| Commercial pad prep (per sq ft, mid-rise residential) | $5 to $18 |
Current Market Reality
Trucking and disposal fees are the two cost drivers that have moved hardest since 2021. Tipping fees at the Metro transfer station and at private clean-fill receivers have climbed 30% to 60% depending on the material classification. Concrete and asphalt demo haul is now its own line item rather than a buried cost, because mixed loads get rejected at most receivers. Hourly excavator rates for a CCB-licensed Portland crew with insurance run higher than rural Oregon. A small excavation job that came in at $4,000 in 2019 is closer to $6,500 to $8,000 today for the same scope -- not because of margin, but because of haul, fuel, and disposal.
Portland BES Stormwater Rules in 97230
The Bureau of Environmental Services regulates how stormwater gets handled on Portland parcels. In 97230, the rules tighten near the Columbia Slough watershed because runoff carries directly into a salmon-bearing waterbody. Practical implications for a homeowner or developer:
- New impervious surfaces over 500 sq ft typically require an on-site infiltration or detention solution.
- Drywells are still allowed in some 97230 subareas but ruled out in others depending on hydric soil classification and proximity to the slough.
- The Simple Trees + Soils method works for small residential projects but requires the soil to actually pass an infiltration test.
- Any work that touches a city-maintained storm system needs a BES permit pulled at the start of the job.
We pull the permit, schedule the BES inspection, and run the test pit where infiltration sizing is the determining factor.
Erosion Control and the Wet Season
97230 sits in Portland's heaviest rainfall band -- the Gateway area sees 40 to 44 inches annually with most falling between November and April. ESCP (Erosion and Sediment Control Plan) compliance is mandatory on any site disturbing more than 500 sq ft inside city limits. Practical site setup includes a stabilized entrance pad, silt fence around the perimeter, gravel filter berms at any low point, and inlet protection on every downstream catch basin. We carry the BMP supplies on every job; the inspector wants to see them before the excavator drops a track on dirt.
Dry-season work in 97230 (June through September) is faster and cheaper than wet-season work because the erosion control footprint is lighter and the soil is workable without pumping. We do work year-round, but a job that can wait 6 to 8 weeks for dry ground usually saves money.
Adjacent Scopes That Pair With Excavation
A 97230 excavation rarely ships alone. Most projects come with one or more of:
- New asphalt or concrete pad after the dig.
- Sealcoat and stripe scheduled inside 12 months once new asphalt cures.
- Final landscape regrade and seeding.
If you are doing a driveway tear-out plus rebuild, our driveway excavation in Portland page walks through the residential scope. For backyard regrade work, our backyard excavation in Portland page covers drainage swales, retaining wall footings, and post-excavation surface restoration. Once the new asphalt is cured, our Multnomah County sealcoating cycle keeps it on schedule.
How a 97230 Quote Comes Together
We walk the site, identify the locates that are visible, request locates from 811 for the ones that are buried, take soil notes, and check groundwater indicators in any exposed cut bank. The written quote itemizes excavation hours, haul loads, disposal fees, BES permit cost, erosion control setup, and any contingency line items for the unknowns the site walk could not resolve.
Cojo runs excavation crews across the Portland metro corridor year-round. We are CCB-licensed, insured, and we hold our excavation work to the standards that Portland inspectors require because we work in this jurisdiction every week. See our broader excavation services page for scope detail.
Start with a site walk and we will give you a real range for your 97230 project. Most quotes turn around inside 48 hours of the walk.