Pavement Management Program

Program Summary

The City of Sammamish Pavement Management Program is a systematic approach that is used to manage the planning, maintenance, repair, and rehabilitation of the City's streets. The goal of the program is to maintain, preserve, and extend the life of the City’s road network in the most cost-effective and efficient manner. This is done by monitoring and managing the condition of the pavement over time, making timely repairs, and implementing preventive maintenance strategies.

The program is comprised of various types of projects that all aim to improve the condition of the City's roadway network. Types of projects include pavement overlays, crack-sealing and chip-sealing, street rehabilitation, street reconstruction, and pavement condition surveys. Pavement overlay projects are generally completed on an annual basis, while other project types are completed on an as-needed basis.  

Current Program Projects

In 2025, the City of Sammamish Pavement Management Program will include the completion of two projects – the 2025 Overlays Project and the Pavement Condition Survey & Management Plan Project.  Click on the link below to see more specific project information.

2025 Overlays

Pavement Condition Survey & Management Plan

The City of Sammamish’s overlay projects provide major street maintenance of roadways in the form of pavement resurfacing, pavement rehabilitation, curb and sidewalk repair, and appropriate Americans with Disabilities (ADA) retrofit work. Pavement overlay projects also replace pavement markings and vehicle detection loops for traffic signals.

For its annual overlay program, the City allocates a certain amount of dollars each year to pave roadways. 

What is an Overlay?

Overlay is the paving of a second layer of asphalt over existing asphalt. It applies about two inches of a mixture of coarse rock and asphalt.  This process extends the useful life of well-traveled streets by up to 20 years.

Some areas of the roadway may need repair before the overlay. Depending on the degree of cracking, crumbling or sinking, some areas may be cut out and patched.

The overlay process reduces pavement distress, lowers noise levels, reduces life-cycle costs, and provides long-lasting service. 

What Happens During the Annual Overlay Project?

Contractor’s crews also repair broken curbs, sidewalks, and rebuild sidewalk ramps to meet current ADA (Americans with Disabilities Act) guidelines. ADA sidewalk ramps makes sidewalks easily accessible to all users.

After the curb and sidewalk repairs are completed, crews prepare the roadway for the asphalt overlay. Defects or cracking in the asphalt may be removed and patched.

Crews then mill and grind the roadway before placing overlay asphalt. This allows the new surface to match up with existing gutters and cul-de-sac/ median islands. 

How the Overlay Process Works

During resurfacing, dump trucks bring hot asphalt to the project site. A paving machine lays down hot asphalt, and large rollers compact the asphalt as it cools. Manhole covers and other utility covers in the roadway are raised to the top of the new asphalt. 

Once the street has reached its optimum compaction value, crews can reopen travel lanes when the asphalt cools enough for safety. At signalized intersections, crews place new loop detectors into the pavement. Finally, crews add new lane markers, crosswalk stripes and arrows.

How Overlays Impact You

Ordinance # 02001-78 prohibits the excavation of resurfaced or newly constructed roads for a minimum of five years following construction or paving. If you are planning to have underground utility work done under the new pavement, you are strongly encouraged to expedite it. This may include utility work such as water, sewer, telephone, gas, electrical, etc. Please call us as soon as possible to coordinate this work.