Lot Grading in Sherwood, Oregon

Quick Verdict

Lot grading in Sherwood is the shaping of a property so it drains correctly and provides a stable base for a home, driveway, or yard. Sherwood sits at the south edge of the Tualatin Valley on gently rolling ground that has shifted from farmland to fast-growing subdivisions. The soil is largely fine valley silt and clay that drains slowly and holds winter moisture, so drainage is the central concern. Good grading here establishes positive slope away from structures, works the gentle rolls with cut and fill, and adds drainage where the soil cannot keep up. With Sherwood's steady residential growth, grading to city standards on these newer lots is essential.

What Lot Grading Does

Grading shapes raw or awkward ground into a buildable, drainable lot. It cuts the high spots, fills the low ones, and sets a slope that sends water where you want it. On a new build it creates the compacted pad; on an established lot it fixes drainage and usability.

The guiding principle is positive drainage away from the foundation. In Sherwood, where the fine valley soil drains slowly, that slope is what keeps crawlspaces dry and foundations stable. The gently rolling terrain gives some natural fall to work with, but lots often still need cut and fill to create a level building area and enough slope for water to move. A common target is a fall of several inches over the first ten feet out from the house, so surface water runs to the street or a drainage system instead of pooling against the slab.

Sherwood's Ground

Sherwood's location and history shape its lots. It sits on former Tualatin Valley farmland, and the ground reflects that:

• Fine silt and clay soils that drain slowly and hold winter water
• Gently rolling terrain with modest rises and low draws
• Former farmland now built into subdivisions with graded lots
• Some low, wet areas that need extra drainage attention
• A high winter water table in the low spots, where the ground stays soft

The slow-draining soil is the everyday challenge. It stays wet into spring and does not absorb water quickly, so grading has to build in a path for water to leave. On the gentle rolls, cut and fill create level pads. Our Oregon excavation contractor guide covers how these valley soils behave in earthwork.

The Grading Process

A Sherwood lot grading job typically follows this sequence:

Step	Purpose
Evaluate lot	Read soil, slope, and drainage
Clear and strip	Remove vegetation, save topsoil
Rough grade	Cut and fill to a level pad
Compact	Firm fill in lifts for stability
Fine grade	Set exact slopes and drainage falls
Drainage	Add drains where slow soil needs help

On Sherwood's gently rolling lots, cut-and-fill slope balancing is common: soil cut from a high spot fills a low one on the same lot, creating a level pad while keeping haul-off down. The same rolling-valley approach applies just north in lot grading in Tualatin, which shares Sherwood's soil and terrain.

Compaction and Proof-Rolling on Valley Clay

On slow-draining clay, how the fill is placed matters as much as the shape of the finished grade. Fill dumped in one deep layer traps soft, wet soil that keeps settling for years, so a proper pad is built in thin lifts -- usually six to twelve inches -- with each layer compacted before the next goes down. That is what stops a driveway or slab from cracking as the ground beneath it sinks unevenly.

Before anything gets built on the pad, a crew often proof-rolls it: running a loaded truck or roller across the surface to find soft, pumping spots where wet clay flexes under the weight. Those areas get dug out and replaced with compacted gravel so the whole pad carries load the same way. On Sherwood's clay this step is the difference between a stable base and a foundation that settles.

• Build fill in thin lifts, not one deep dump
• Compact each lift to a firm, non-pumping surface
• Proof-roll the pad to find soft spots
• Over-excavate and replace weak areas with gravel

Drainage on Slow Soil

In Sherwood, grading and drainage go together because the fine valley soil drains slowly. Surface slope alone often is not enough, so swales, catch basins, and downspout drainage lines carry water off the lot to the street or storm system. A yard that floods every winter is usually a drainage problem that regrading and a French drain solve.

Getting drainage right protects the foundation from the constant moisture that fine soil holds and keeps the yard usable through the wet season. On newer subdivision lots, the grading has to tie into the neighborhood's storm system correctly, which is part of meeting the city's development standards.

Growth, Permits, and Erosion Control

Sherwood is a growing city, and it enforces grading and drainage standards, especially in new development. Grading that involves significant cut or fill, a new build, or a subdivision lot commonly requires a permit and must meet City of Sherwood and Washington County drainage requirements.

Larger disturbances trigger erosion control, and a site that clears an acre or more can fall under the state DEQ 1200-C construction stormwater permit. That matters on slow-draining ground, where loosened clay turns to sediment fast and washes into storm drains and creeks. Erosion measures -- silt fence, gravel entrances, covered stockpiles, and a stabilized surface before winter -- are part of doing the job to standard, not an afterthought. Always call 811 before digging so buried utilities are located and marked.

Because Sherwood's residential growth is active and standards are enforced, working to the approved grading and drainage plan is essential. An experienced contractor handles the permitting and erosion control as part of the project, and makes sure a lot ties into the neighborhood drainage properly.

What Drives the Cost

Lot grading cost in Sherwood is driven by lot size, the amount of cut and fill, the soil, and how much drainage the slow ground requires. A simple regrade is affordable; a full pad with drainage on slow-draining soil costs more.

Unit	Baseline Range
Grading / leveling, per sq ft	$0.75 - $4.00+ per sq ft
Excavator + operator, hourly	$150 - $350+ per hour
Crushed gravel, delivered, per cu yd	$45 - $110+ per cu yd
French drain, per linear foot	$15 - $120+ per linear foot
Minimum job callout	$500 - $1,500+

Industry Baseline Range: grading and leveling runs $0.75 to $4.00+ per square foot, an excavator and operator runs $150 to $350+ per hour, crushed gravel delivered runs $45 to $110+ per cubic yard, and a French drain runs $15 to $120+ per linear foot. Small jobs carry a $500 to $1,500+ minimum callout.

These are industry baseline ranges for planning only -- actual pricing depends on site conditions, soil, access, depth, haul-off, and current market conditions. Get a site-specific quote.

Current Market Reality

Real costs often run 2 to 3 times baseline when soft clay has to be over-excavated, drainage and erosion control are required, or fill and gravel have to be trucked in. On Sherwood's slow-draining lots, most quality grading is scheduled for the drier May through October window, when the fine valley soil firms up enough to compact and hold a grade. Winter grading fights mud and a high water table and usually costs more for a worse result.

The Bottom Line

Lot grading in Sherwood means shaping gently rolling valley ground into a level, well-drained pad on slow-draining soil. Balance cut and fill, compact in lifts, pair slope with drainage, and meet the city's development standards, and the site drains and builds well. As a CCB licensed and insured Oregon contractor working statewide since 2009, Cojo grades lots across Sherwood and the south Tualatin Valley. See our excavation services or request a free estimate to plan your project.