Sherman County has the smallest population of any Oregon county, with Moro as the county seat at roughly 320 residents, Wasco as the largest community at 410, and Rufus, Grass Valley, and Kent rounding out a county where the entire population fits comfortably under 2,000. The county sits on the Columbia Plateau wheat country between the Deschutes River and the John Day River with I-84 running along the Columbia River edge at the north end. Paving demand here is driven by ranch and wheat-haul access, wind-farm infrastructure, and ODOT-spec frontage along I-84 and Highway 97.
This guide covers Sherman County subgrade, the Columbia Plateau climate and wind exposure, the wind-energy commercial work base, and 2026 cost ranges that reflect long haul distances and a tiny commercial market.
Moro, Wasco, Rufus, and the County Spread
Moro is the county seat with a small downtown along Main Street (Highway 97) and the Sherman County courthouse complex. Wasco (north of Moro on Highway 97) and Grass Valley (south of Moro on Highway 97) anchor small downtown grids and serve as service nodes for the surrounding wheat farms and ranches. Rufus along I-84 and the Columbia River hosts the Rufus rest area, the Lone Pine Truck Stop, and the John Day Dam visitor center. Kent and Klondike round out the rural community map.
Outside the towns, Sherman County is wheat country -- some of the most productive dryland wheat farms in the country -- and the work mix reflects that. Grain elevators along the rail line, ranch headquarters scattered across the plateau, and a substantial wind-energy presence (Shepherds Flat, Wheatridge, and adjacent projects) drive periodic large-scale paving demand for access roads, substation pads, and maintenance facilities.
For lot-marking work that pairs with paving, see the Sherman County parking lot striping guide.
Columbia Plateau Subgrade
Sherman County subgrade is consistent across most of the county -- Columbia River basalt overlain by Palouse silt loam (loess) ranging from 2 to 30 feet deep, with thin lake-bed clay deposits in low-lying areas. Practical implications:
- Loess is well-drained but frost-susceptible
- Basalt is excellent base material once exposed but requires rock-hammer on hillside cuts
- The deeply incised Columbia and John Day River canyons create dramatic elevation changes -- access roads frequently traverse 1,000+ feet of vertical from plateau down to river
Frost depth on the plateau commonly reaches 24 to 36 inches; the river-edge sites at Rufus see milder frost.
Standard base build for a Sherman County commercial lot:
- 12 to 18 inches of crushed-aggregate base over native subgrade
- Geotextile fabric where subgrade is clay-heavy
- 3 to 4 inch asphalt base lift
- 2 inch wear course
- 6 inches total mat thickness for downtown commercial, 7 to 8 for wind-farm access and grain-truck routes
For trenching, hillside cuts, and site prep, the Sherman County excavation guide covers the work mix.
Climate: Wind and the Paving Window
Sherman County is one of the windiest counties in Oregon -- the same gorge winds that drive the wind-energy industry create real paving-logistics challenges. Sustained wind cools hot-mix faster than calm air, shortening the workable window after delivery. Crews schedule placement for the calmer morning and evening windows when feasible.
Moro at 1,820 feet of elevation sees winter lows to 0 degrees F or colder. Rufus at 200 feet along the Columbia is several degrees warmer year-round but exposed to the strongest gorge winds. Summer highs reach 95 to 105 degrees F across the plateau.
Paving window:
- Optimal: late May through mid-September
- Marginal: mid-May, late September
- Hard no-go: October through mid-May -- frost and freeze-thaw
Pair every paving job with a Sherman County sealcoating cycle every 2 to 3 years.
ODOT, Wind-Energy, and Federal Permits
ODOT approach permits apply on I-84, Highway 97, Highway 206, and the various ODOT facility approaches. Wind-energy work typically operates under master development agreements that bundle BLM, ODOT, and county permitting. Sherman County itself permits unincorporated work; Moro, Wasco, Grass Valley, and Rufus each have city processes.
Stormwater triggers are rare at Sherman County's rural density. DEQ 1200-C applies on projects disturbing 1 acre or more of ground -- this often catches wind-farm and grain-elevator expansion work.
Industry Baseline Range
Industry Baseline Range
| Project Type | Typical Size | Baseline Cost Range |
|---|---|---|
| Small commercial / downtown lot | 5,000 to 10,000 sq ft | $27,000 to $56,000 |
| Medium commercial lot | 10,000 to 25,000 sq ft | $56,000 to $140,000 |
| Wind-farm access / substation pad | 25,000 to 100,000 sq ft | $140,000 to $550,000+ |
| Residential / ranch driveway | 600 to 2,000 sq ft | $4,800 to $14,500 |
| Ranch / wheat-haul access road | per linear foot, 14 ft wide | $26 to $50 per linear ft |
| Overlay (existing base in good shape) | per sq ft | $4.00 to $6.50 per sq ft |
| Full-depth replacement | per sq ft | $7.50 to $13.50 per sq ft |
Current Market Reality
Sherman County prices reflect long haul distances -- the nearest hot-mix plants are in The Dalles, Hermiston, or seasonal portable plants set up for ODOT or wind-farm work. Mobilization and haul cost routinely run 15 to 30 percent higher than comparable Willamette Valley work. The wind-energy commercial work base shapes pricing on access-road and substation-pad work, with polymer-modified binder and prevailing-wage compliance pushing wind-farm bids above standard commercial rates. For statewide context, see the Oregon asphalt paving cost breakdown.
Choosing a Contractor for Remote Plateau Work
Sherman County is far enough from any metro that contractor selection narrows quickly to crews willing to mobilize for the haul. Things to verify:
- CCB license, active Oregon insurance, and worker's comp
- Documented hot-mix source and haul plan
- References from comparable Sherman, Gilliam, or Wasco County jobs
- Wind-energy contract experience if scope includes substation or access-road work
- Realistic schedule built around the wind exposure and short summer window
- Itemized base prep, mat thickness, and compaction documentation
Plan Your Sherman County Paving Project
Cojo paves Sherman County for ranch driveways, downtown commercial lots in Moro, Wasco, and Rufus, wind-farm access work, and ODOT-spec frontage along I-84 and Highway 97. We bid every job with itemized engineering and pair the work with an asphalt maintenance services cycle so wind, UV, and freeze-thaw do not steal the pavement's service life.
Contact our crew for a written bid built for Columbia Plateau conditions instead of a Willamette Valley template.