Excavation work in 97030 covers downtown Gresham, the MAX Blue Line corridor along NE 8th Street, and the residential and mixed-use redevelopment pockets between Civic Drive and Hogan. This is the densest stretch of Gresham -- older single-family homes mixed with mid-density apartment infill, small commercial pads, and the increasing volume of accessory dwelling unit (ADU) work that comes with city policies that have opened up backyard development.
What Makes 97030 Excavation Distinct
Three factors define the 97030 excavation environment. First, the soil column varies block to block. Most of downtown Gresham sits on Boring Lava Group bedrock with an alluvial cap of varying thickness. Some lots hit weathered rock at 4 to 6 feet; others have 15+ feet of mixed silt and clay before refusal. The depth-to-rock determines whether a basement is practical and whether trenching uses a standard mini-ex or a rock attachment.
Second, the buried infrastructure inventory is messy. Downtown Gresham has been built and rebuilt repeatedly since the 1940s. Decommissioned septic systems from before sewer extension, abandoned utility laterals, lead service lines from older homes, and undocumented private storm drains are all common finds. Locates are mandatory and hand-digging at every utility crossing is standard.
Third, Multnomah County and the city of Gresham share permit jurisdiction depending on parcel location. Both agencies want erosion control compliance and stormwater management plans on most projects.
What Cojo Handles in 97030
Our 97030 excavation scope covers:
- ADU pad and footing excavation -- the most common 97030 residential job.
- Single-family home additions, garage slabs, and basement excavation where feasible.
- Driveway tear-out and rebase for older asphalt that has reached end of life.
- Utility trenching for sewer lateral replacement, water service upgrades, and electrical conduit.
- Stormwater work -- catch basins, infiltration trenches, drywell pits where allowable.
- Backyard regrade for drainage correction and retaining wall footings.
- Small commercial pad prep for ground-floor retail and mixed-use new construction.
We do not do deep-foundation work over 10 feet. Anything below that needs a structural excavator with shoring expertise.
Cost Discipline: What 97030 Excavation Runs
Excavation is the most variable scope in the paving and site-prep family. Two similar-looking lots can have radically different costs if one hits rock at 4 feet and the other does not. The baseline below is a planning frame -- the real quote depends on what the walk and locate package surface.
Industry Baseline Range
| Scope | Typical Cost |
|---|---|
| ADU or garage pad (small residential) | $5,000 to $18,000+ |
| Basement excavation (residential, with shoring) | $20,000 to $80,000+ |
| Driveway 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 |
| Small commercial pad prep (per sq ft) | $5 to $18 |
Current Market Reality
Trucking and disposal fees are the biggest movers in 97030 excavation pricing since 2021. Metro transfer station tipping fees have climbed 30% to 60% depending on the material classification. Mixed loads -- which used to be tolerated at lower rates -- now get rejected at most receivers, which means concrete demo and asphalt demo are separated at the source. Crew rates for a CCB-licensed Gresham excavation outfit run higher than rural Oregon because regional construction demand keeps wages elevated. A small excavation job that was $4,000 in 2019 is closer to $6,500 to $8,000 today for the same scope -- driven by haul, disposal, and fuel rather than margin.
Permits, Locates, and the Multnomah County Process
Gresham building department reviews most ADU, addition, and new-construction excavation work. Multnomah County engineering reviews work in the unincorporated pockets. Either way, the process includes:
- 811 utility locate request before any dig (legal requirement, 2 business days).
- City or county permit application with site plan and erosion control plan.
- Pre-construction meeting on larger jobs.
- Inspection at key milestones -- footing dig, backfill, final grade.
We pull permits, schedule locates, coordinate inspections, and run erosion control compliance on every job. The property owner does not have to navigate the agency interface.
Erosion Control and the Wet Season
97030 sits in Portland's moderate-to-heavy rainfall band -- 40 to 44 inches per year with most falling between November and April. Oregon's ESCP (Erosion and Sediment Control Plan) rules require BMP setup on any disturbance over 500 sq ft. Practical site setup includes a stabilized entrance pad, silt fence around the perimeter, gravel filter berms at low points, and inlet protection on downstream catch basins.
Dry-season excavation (June through September) runs faster and cheaper than wet-season work because the BMP footprint is lighter and soil is workable without pumping. We work year-round, but a project that can wait 6 to 8 weeks for dry ground usually saves money on both labor hours and disposal weight (wet soil weighs more, which raises tip fees).
Adjacent Scopes That Pair With Excavation
A 97030 excavation rarely ships alone. Most jobs come with one or more of:
- New asphalt or concrete pad after the dig.
- Curb and ADA ramp work on commercial pads.
- Sealcoat and stripe scheduled inside 12 months once new asphalt cures.
- Final landscape regrade.
For driveway tear-out and rebuild, see our driveway excavation in Gresham page. For backyard regrade and drainage work, our backyard excavation in Gresham page covers the residential scope. Once new asphalt is cured, our Multnomah County sealcoating cycle keeps it on schedule.
How a 97030 Excavation Quote Comes Together
We walk the site, identify visible locates, request 811 locates for buried utilities, take soil notes, and check for groundwater indicators in any exposed cut. The written quote itemizes excavation hours, haul loads, disposal fees, permit cost, erosion control setup, and contingency line items for unknowns the site walk could not resolve.
Cojo runs excavation crews across the Portland metro corridor year-round. We are CCB-licensed and insured, and we hold our excavation work to the standards Gresham and Multnomah County inspectors require because this is jurisdiction we work in every week. See our broader excavation services page for scope detail.
Schedule a site walk and we will give you a real range for your 97030 project. Most quotes turn around inside 48 hours of the walk.