We Have Come a Long Way on Street Rehabilitation
Since 1995, the Reno City Council has made street maintenance and rehabilitation a major priority. The City's Public Works Department has put forth an extraordinary effort over the last ten years to improve neighborhood streets throughout our community, and today drivers can see the difference.
In 1997, the Reno City Council adopted a comprehensive, long term plan to catch up on the backlog the City faced regarding street maintenance. This strategic plan calls for more than merely catching up on the backlog. It provides a long-term maintenance regimen that will prevent the City of Reno from falling behind on street maintenance in the future.
Rehabilitation and Maintenance on Streets From 1995 through 2015
- 107.3 Miles of neighborhood streets have been rehabilitated
- 107.9 Miles of Regional roads have been rehabilitated
- 18.4 Miles of industrial roads have been rehabilitated
- 510.0 Miles of neighborhood collector and local streets have been surface treated
Street Rehabilitation Program and Maintenance Strategies
Crack SealCity streets that are in good condition, typically with PCI greater than 65, receive crack seal treatment. The City has an annual maintenance program to keep our high quality streets operating at their full potential. If moisture penetrates the asphalt into the base layers it can compromise the integrity of the structure and cause failures, such as fatigue cracking and potholes. Crack seal prevents moisture from working its way under the asphalt into the base layers. Crack seal treatment is relatively inexpensive but effective for keeping streets in good condition. This treatment lasts approximately three to five years.
Slurry SealSlurry seals are typically used on streets with a PCI ranging from 65 and better. Slurry seal is a mixture of an oil emulsion and coarse, sandy aggregate (1/4" to 3/8" in size) applied in a single thin layer to the entire street surface. Streets look new with slurry seals and it helps protect the surface from intrusion of moisture, other contaminants, and oxidation from sun and weather. When applied to streets in good condition, regular slurry seal applications can extend the life of street pavement beyond the normal 20 years. This treatment lasts approximately five years.
Rapid Set Slurry SealRapid set slurry seal looks similar to slurry seal, but the difference is in the emulsion. The emulsion contains polymers to cause a faster set time and allows the slurry mixture to be "stacked" in two layers when needed. This material can help resolve pavement roughness in addition to extending the life of a pavement. This treatment can improve the ride quality of deteriorated streets and typically lasts for five to ten years.
OverlayTypically, streets with a PCI rating between 41 and 60 sometimes need a little extra help. These streets still have good base material but the surfaces need work. An overlay consists of grinding a portion of the existing surface, repairing any bad spots with patching, then overlaying the area with a two to three inch layer of new asphalt concrete. Placing an overlay on streets before they get worse is less expensive than reconstruction. This treatment lasts approximately 15 years.
ReconstructionStreets with a PCI less than 40 are typically failed. These streets are typically 30 years old and older. They have outlived their service life and the only strategy is to reconstruct them. Reconstruction is the process of removing the existing pavement entirely and sometimes the base layer must be removed as well. New aggregate base material is placed and compacted or the old material is pulverized and recompacted. A new asphalt surface is placed on top. Curbs, gutters and sidewalks are often replaced as part of a road reconstruction project. Reconstructed streets are designed to last for 20 years, but with proper maintenance the constructed pavements can last for many years beyond the design life.