Calculate cubic yards, bags needed, and Willamette Valley–accurate ready-mix costs for any Eugene project — driveways, foundations, wet-season slabs, Lane County footings & more.
Cubic yards, bags needed & Willamette Valley ready-mix cost — instant results
Driveway: 4 in. min, 3,000 PSI. No air entrainment required in Eugene's mild climate. Rebar on expansive clay (west Eugene). No permit needed for private flatwork. Avoid pouring on saturated subgrade Nov–Apr. Call 811 before digging.
Patio/walkway 3.5–4 in · Driveway 4–5 in · Garage floor 4–5 in · Footing 12–18 in · Foundation wall 8 in min · Retaining wall 8–12 in
Eugene's two dominant concrete challenges are its expansive Willamette Valley clay soils and its long wet-weather construction season. Malpass clay — common in west and south Eugene — has some of the highest shrink-swell potential of any soil in the Pacific Northwest, expanding dramatically with winter rain saturation and contracting in summer drought, causing slab settlement and foundation cracking without proper subgrade prep. Eugene's wet winters (Nov–Apr) also saturate subgrades, making it extremely difficult to achieve the 95% compaction required under concrete slabs — waiting for dry, firm subgrade is often more cost-effective than pouring over wet clay. Ready-mix costs $139–$177/yd from local Lane County suppliers. [web:95][web:92][web:99]
Malpass clay and related expansive clay soils in west and south Eugene have very high shrink-swell potential, shrinking in summer drought and expanding with winter rains. Never pour concrete directly on uncompacted clay or saturated subgrade. Over-excavate 4 inches and replace with compacted ¾-inch crushed base; use 3,000–3,500 PSI with rebar or wire mesh on clay sites; and wait for dry, firm, compacted subgrade before scheduling any pour. A geotechnical report is required by Eugene Building & Permit Services for most new foundations. [web:99]
Eugene Building & Permit Services does NOT require a permit for concrete flatwork (patios, driveways, walkways on private property). Permits ARE required for all structural concrete — foundations, stem walls, retaining walls over 4 ft, ADUs, garages, and additions. A mandatory footing inspection is required before any structural concrete is placed. Contact Eugene Building & Permit Services at (541) 682-5086 before starting any structural project.
10×40 ft at 4 in. = ~4.9 yd. At $139–$170/yd → $681–$833 material. 3,000 PSI standard. Rebar recommended over clay. No permit for private flatwork. Avoid Nov–Apr pours on saturated subgrade. Call 811 before digging. [web:95]
Eugene's Oct–May rainy season creates saturated subgrades. Never pour on standing water or waterlogged clay — wait for firm, compacted subgrade. Cover fresh concrete immediately if rain is forecast within 2 hours of placement. Protect from heavy rain for the first 4 hours after finishing. Schedule pours for dry-weather windows whenever possible. [web:97]
Oregon RSC requires footings at 12 in. min below grade in Lane County. 3,000–3,500 PSI. #4 rebar min. Eugene Building & Permit Services mandatory footing inspection before pour. Geotech report typically required for new residential construction in Eugene's clay-soil areas. ADU foundations follow ORSC Chapter 4 provisions. [web:96]
Eugene is served by multiple Willamette Valley ready-mix suppliers. Short-load fees of $100–$200 apply for orders under 7–8 yards. Weekend/holiday surcharges of $50–$100 are common. Pump truck rental adds $300–$800/day for projects where direct truck chute access is not possible. [web:92]
| Mix / PSI | Eugene / Lane Co. Price / Yd | National Avg | Best For | Oregon RSC |
|---|---|---|---|---|
| 2,500 PSI | $139–$152 | $119–$132 | Non-structural walkways, interior slabs | Non-Structural |
| 3,000 PSI ← OR Standard | $144–$162 | $124–$140 | Driveways, patios, garage floors | Compliant |
| 3,500 PSI | $150–$168 | $130–$148 | Foundations, structural slabs, ADUs | Compliant |
| 4,000 PSI | $158–$177 | $136–$155 | Heavy structural / commercial | Compliant |
| 5,000 PSI | $168–$195 | $147–$172 | Post-tensioned / commercial specialty | Engineer Req. |
| Fiber / Stamped / Colored | $175–$225 | $155–$205 | Decorative driveways, outdoor patios | Compliant |
Issues all Eugene building permits under the Oregon Residential Specialty Code. Permits required for foundations, structural slabs, retaining walls, ADUs, garages, and additions. Mandatory footing inspection before structural concrete is placed. Contact at (541) 682-5086 or visit Eugene City Hall.
Visit Eugene PermitsAll Oregon concrete contractors must hold a valid Construction Contractors Board (CCB) license. Oregon law requires CCB licensing for any construction work over $500. Always verify your Eugene concrete contractor's CCB license before signing a contract — unlicensed contractor work creates significant homeowner liability.
Verify OR Contractor LicenseOregon law requires calling 811 at least 2 business days before any excavation in Eugene. The Oregon Utility Notification Center coordinates free marking of underground NW Natural gas, EWEB electric/water, and telecom lines. Failure to call is a violation of Oregon law and creates serious safety and financial liability.
Visit Oregon 811