The Washtenaw County Road Commission (WCRC) is responsible for road and bridge construction on public roads located outside city and village limits. Road construction projects are selected based on criteria including: pavement condition, traffic counts, available funding, and road classification (primary or local).

Due to limited road funding, WCRC must balance repair types with our available budget and make the right investment at the right time to preserve the overall road network. To learn more about road funding, visit our FAQ.

What are the common types of road construction projects and what do they cost?

The cost of road repairs depends on a number of variables, including the location, type of construction, the number of lanes, lane width, and the condition of the road. Road work typically cost more in urban areas than rural areas. Keeping a road in “good” condition is less expensive than rebuilding a deteriorated road.

Below are some common types of road construction projects. The costs mentioned in the descriptions below are estimates per lane mile. Please note that projects can cost more or less depending on the cost of materials, schedule, traffic volumes, environmental impacts and other factors.

Pulverize & Resurface

When a road is in “poor” condition, it may be rebuilt through a process of pulverization and resurfacing. WCRC uses a machine called a pulverizer which is capable of breaking up 6-10 inches of existing asphalt pavement. WCRC then recycles and compacts the pulverized asphalt to create a new road base. After establishing the new road base, crews apply two layers of new asphalt to create a smooth, long-lasting road surface.  A pulverized and resurfaced road will last 10-15 years and costs approximately $300,000 per mile.

Mill & Resurface

Roads that are in “fair” condition are good candidates for a mill and resurfacing project. During a typical mill and resurfacing project, one layer (1.5–2 inches) of existing asphalt is removed (milled) and the road is resurfaced with a new layer of asphalt. A milled and resurfaced road will last around 7-9 years and costs approximately $170,000 per mile. If the road has deteriorated into “poor” condition, milling one layer of the roadway is usually not enough to improve the ride condition and prevent future deterioration and potholes.

Chip Seal / Seal Coat

Chip sealing is a relatively low-cost surface treatment that seals and prevents water from seeping into the roadway. Chip sealing helps prevent potholes and protects the road surface from the damaging effects of weather, sun, and traffic. A chip seal can help extend the life of a road by 3-7 years and costs approximately $25,000 per mile. WCRC aims to chip seal roads that have been recently pulverized or milled in order to extend their lifespans.

Bridges – Routine Maintenance & Reconstruction

Washtenaw County is home to 119 bridges, many of which were built in the early 1900s. Each year WCRC performs preventative maintenance on bridges with available resources. However, a bridge must be completely replaced if it is deemed structurally unsound during WCRC’s routine inspections.

Bridge replacement projects differ in scope depending on the type, size, traffic volume, and environmental surroundings. A bridge replacement will typically take 3-6 months to construct and can cost anywhere from $500,000 to $3 million depending on the size of the project.

Culverts – Repairs & Replacement

WCRC is also responsible for the maintenance of over 2,000 culverts. Culverts allow water to easily flow underneath a road. Culverts are prefabricated and can be round, oval or box-shaped. They can span between 1 to 20 feet. Similar to the Washtenaw County’s bridges, many culverts were built in the early 1900s, have exceeded their lifespans and require repairs or replacements.

Why is this road being treated when our road looks much worse?

Due to limited road funding, WCRC is focused on making the right investment at the right time (asset management) to save taxpayer dollars and extend the service life of our roads. Asset management is similar to vehicle maintenance. You can wait until the engine fails before you take your car in for repairs, or you can take your car in for routine oil changes. Routine maintenance will make your car run smoother and avoid costly engine repairs. Road work is similar. WCRC performs preventative maintenance on roads that are already in “good” condition to extend the road’s lifespan and avoid costly reconstruction projects when a road falls into “poor” condition.

Why are you putting “tar and gravel” on our paved road?

The tar and gravel you see on a road is called a chip seal. During a chip seal project, a dump truck full of slag stone locks on to a chip spreader that is pulled backward. A thin layer of liquid asphalt is sprayed down in front of the chip spreader.

During the chip seal process- from the time the gravel is placed on the road to when the excess is swept away- the speed limit is 35 mph. At 35 mph, vehicles should not be damaged by loose stones.

Chip sealing is a relatively low-cost surface treatment that prevents water from seeping into the roadways, which helps prevent potholes and protects the road surface from the damaging effects of weather, sun, and traffic. A chip seal can help extend the life of a road by 3-7 years.

Will I be able to access my driveway when crews are paving?

Yes, with one exception – when crews are paving directly in front of a driveway. Paving operations typically take 30-60 minutes. During paving operations, traffic must be restricted due to the extremely hot temperature of the asphalt and to minimize damage to the new road surface.

Paving is a moving operation and weather-dependent. There is no exact schedule of when crews will be pave in front of a driveway. If you see crews nearing your residence, let them know your needs and they will assist you in entering or exiting your driveway safely.

What do I do if construction activities, vehicles or materials damage my car?

If your vehicle sustained damage while driving through a construction zone on a road under the jurisdiction of the Washtenaw County Road Commission (WCRC), you may be eligible to file a claim. Please visit our Damage Claim page for more information. WCRC’s jurisdiction includes public roads located outside of city and village limits.

How can I stay informed of upcoming road construction?

During the summer construction season, WCRC publishes a weekly road construction schedule on Thursday mornings which includes roadwork occurring the following week. To view the weekly schedule, click here. For a complete list of the year’s scheduled road construction projects, visit our Current Projects page.

Current Projects

Click to view a list and map of this year’s road improvement projects.

Four-Year Road Millage

Click to learn more about Washtenaw County’s road & non-motorized path millage.