Morrow County stretches from the Columbia River south into the Blue Mountains with Heppner as the county seat and Boardman as the commercial and industrial hub along the river. Irrigon, Lexington, Ione, and Hardman round out the small-town network across one of Oregon's classic wheat-country counties. The work mix has changed dramatically over the last decade -- Boardman has grown into a regional logistics, data-center, and food-processing center with major Amazon AWS, Threemile Canyon Farms, and Boardman Wind / Solar developments anchoring the work base. Heppner and the inland communities still run on traditional wheat, ranching, and small-commercial paving.
This guide covers Morrow County subgrade, the I-84 corridor work mix, the Boardman data-center spec environment, and 2026 cost ranges for ag, downtown, and industrial paving.
Heppner, Boardman, Irrigon, and the County Split
Heppner is the county seat at roughly 1,250 residents with a small downtown along Main Street (Highway 207), the Heppner Hospital District facilities, the Morrow County courthouse, and rural-residential and ranch paving demand. The county-government complex and the Pioneer Memorial Hospital drive most institutional work in the inland county.
Boardman has emerged as the dominant commercial center despite being smaller than Heppner -- roughly 3,500 residents with the Port of Morrow industrial complex, the Amazon AWS data-center cluster, the Lamb Weston frozen-potato plant, the Tillamook Cheese cheese-making facility, and a substantial trucking and logistics corridor along I-84. Irrigon along the Columbia, Lexington and Ione south of Heppner, and Hardman in the Blue Mountain foothills round out the work mix.
For lot striping that pairs with paving, see the Morrow County parking lot striping guide.
Columbia Plateau Subgrade
Morrow County subgrade is shaped by the Columbia Plateau geology:
- Columbia River alluvium (Boardman, Irrigon) -- well-drained sand and silt loam; excellent base bearing
- Columbia Plateau wheat country (Lexington, Ione, the central county) -- Palouse silt loam (loess) over Columbia River basalt; frost-susceptible but well-drained
- Blue Mountain foothills (Hardman, southern county) -- weathered basalt and forest clay; rock-hammer common on hillside cuts
- Irrigated bottoms -- silty loam with agricultural history; can need geotextile under base
Frost depth on the plateau commonly reaches 18 to 30 inches; the river-edge sites at Boardman see milder frost.
Standard base build for a Morrow County commercial lot:
- 12 to 18 inches of crushed-aggregate base over native subgrade
- Geotextile fabric where subgrade has clay content over 15 percent
- 3 to 4 inch asphalt base lift
- 2 inch wear course
- 6 inches total mat thickness for retail, 7 to 8 for data-center and heavy-truck work
For trenching, hillside cuts, and site prep, the Morrow County excavation guide covers the work mix.
Boardman Industrial Spec Environment
The Boardman industrial corridor operates on tighter pavement specifications than typical eastern Oregon work. Amazon AWS, Lamb Weston, and Tillamook facilities specify thicker mats, polymer-modified binder, and more aggressive compaction targets than retail or small-commercial work. Data-center campus paving frequently runs:
- 8 inches total mat thickness with stabilized base
- PG 70-22PM polymer-modified binder
- Documented compaction testing at minimum every 1,000 square feet
- Stormwater management with detention basins and infiltration galleries
- Prevailing-wage compliance under federal or large-corporate contract terms
Plan accordingly when bidding adjacent commercial work -- nearby Boardman small-commercial projects often inherit elevated material costs because the local hot-mix plant is producing premium mixes for the larger campuses.
Climate and the Paving Window
Boardman at 290 feet of elevation along the Columbia is one of the warmest spots in eastern Oregon. Summer highs commonly reach 95 to 105 degrees F, winter lows are mild compared to the high desert (15 to 25 degrees F typical), and the paving window is longer than the inland communities. Heppner at 1,955 feet and Hardman at 3,500 feet run on a substantially shorter season.
Boardman paving window:
- Optimal: mid-May through mid-October
- Marginal: early May, late October
- Hard no-go: November through April
Heppner / inland paving window:
- Optimal: late May through mid-September
- Marginal: mid-May, late September
- Hard no-go: October through mid-May
Pair every paving job with a Morrow County sealcoating cycle every 2 to 3 years.
ODOT, County, and Industrial Permits
ODOT approach permits apply on I-84, Highway 74 (Heppner Highway), Highway 207, and Highway 730. Morrow County permits unincorporated work, and Heppner, Boardman, Irrigon, Lexington, and Ione each have city processes. Boardman industrial work runs under Port of Morrow contract authority for tenant projects and individual corporate contracts for the larger facilities.
Stormwater compliance is tighter along the Columbia corridor due to watershed protection. DEQ 1200-C applies on projects disturbing 1 acre or more.
Industry Baseline Range
Industry Baseline Range
| Project Type | Typical Size | Baseline Cost Range |
|---|---|---|
| Small commercial / downtown lot | 5,000 to 10,000 sq ft | $25,000 to $52,000 |
| Medium commercial lot | 10,000 to 25,000 sq ft | $52,000 to $130,000 |
| Large industrial / data-center / port lot | 25,000 to 250,000 sq ft | $130,000 to $1,250,000+ |
| Residential / ranch driveway | 600 to 2,000 sq ft | $4,500 to $14,000 |
| Ranch / agricultural / wheat-haul road | per linear foot, 14 ft wide | $25 to $48 per linear ft |
| Overlay (existing base in good shape) | per sq ft | $3.75 to $6.25 per sq ft |
| Full-depth replacement | per sq ft | $7.50 to $13.00 per sq ft |
Current Market Reality
Morrow County paving prices split between Boardman-area work (running near central-Oregon medians because of data-center demand and a busy hot-mix plant in Boardman) and Heppner-area work (running higher because of haul distance and smaller scale). 2026 delivered hot-mix cost has climbed roughly 18 to 22 percent over 2022. For statewide context, see the Oregon asphalt paving cost guide.
Selecting a Morrow County Paving Contractor
Morrow County overlaps with Umatilla County and the broader Columbia Plateau paving market. Verify on every bid:
- CCB license, active Oregon insurance, and worker's comp
- Itemized base prep, mat thickness, binder grade, and compaction lines
- Documented compaction-test plan for data-center or industrial work
- References from comparable Morrow or Umatilla County jobs
- Realistic schedule that accounts for the prime Boardman industrial demand window
Plan Your Morrow County Paving Project
Cojo paves Morrow County from Boardman and the I-84 corridor through Heppner, Irrigon, Lexington, and out to the more remote ranching properties. We bid every job with itemized engineering and pair the work with an asphalt maintenance services cycle so the high-desert UV and freeze-thaw do not steal the pavement's service life.
Request a quote and we will walk your site, document subgrade and use-case loading, and write a bid that fits Columbia Plateau conditions.