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City of Sammamish’s overlay program provides major street maintenance of roadways. This maintenance include street overlays, 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. In 2017 the City allocated $3,500.000.00
What is the overlay and its process?
Overlay is the paving of a second layer of asphalt over existing asphalt with a mixture of coarse rock and asphalt, about two inches in depth.
Depending on the degree of cracking, crumbling or sinking, some areas on the roadway can be cut out and patched before the overlay. The overlay process reduce pavement distress, lower noise levels, reduce life-cycle costs, and provides long-lasting service.
Besides overlaying the streets during the annual overlay project, contractor’s crews also repair broken curbs, sidewalks, and rebuild the sidewalk ramps to meet the most 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 to allow for the placement of the new asphalt surface to match the existing gutters and cul-de-sac/median islands.
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 and adjusted to the new roadway elevation.
When the street reaches its optimum compaction value based on WSDOT standards and has cooled enough to safely carry traffic, crews reopen travel lanes. At signalized intersections, crews place new loop detectors into the pavement. Finally, crews add new lane markers, crosswalk stripes and arrows.
General Information about the Project:
Hours of work will be between 7:00 am and 5:00pm daily.
Driveway Access on most streets will remain open throughout most of the construction, with one lane of traffic that is controlled by flaggers. In cul-de-sacs, crews will work with the residents to temporarily close the cul-de-sac so that paving operations can be completed quickly. During the actual paving process, there is typically a two to three hour time period where access to driveways is not allowed. This is time needed for the pavement to cool and harden before traffic can drive on it.
On Street Parking will need to be restricted on construction days. Signs will be posted in advance of the work to notify residents of the parking restrictions.
Waste and Recycling Schedule will not be affected by construction. When days of paving and waste collection coincide, we work with the collection service to adjust their route schedule and focus first on the streets that are being paved. If there is construction in your neighborhood, please be sure to have your waste and recycling out extra early.
Tree Trimming may need to be done in front of your house. If there is vegetation in front of your property that extends out into the street, it will need to be pruned back to allow the equipment to do the street resurfacing. Please trim the vegetation along your property if this is the case. City crews or the Contractor will trim vegetation as needed for the project. However, they will only be doing the minimum needed to clear the road for paving and some additional trimming may need to be completed afterwards by the adjacent property owner.
Street Cuts - 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 any underground utility work done, such as water, sewer, telephone, gas, electrical, etc., you are strongly encouraged to expedite this work if it involves utility work under the new pavement. Please call us as soon as possible to coordinate this work.
If you have any questions about the construction please call or email Ben Ressler.