Agenda Packet 3-14-18 Work Session

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Concrete Improved Street System Of the 549 centerline miles of streets 34 centerline miles (85lane miles) are concrete. In 2015 staff were able to refine concrete street inventory data so condition inspections could be completed. Unlike asphalt streets, concrete streets require panel counts plus an average width and length of the panel for the calculation of PCIs. Concrete segments are best evaluated when defined as a city block. Historical concrete designs for typical city blocks contained 66 panels, three columns of panels within a block length,or 33 panels with twocolumns. Concrete streets like bike paths are built for alife of 50 or more years until complete reconstruction. Deterioration of concrete streets occur within individual panels with many panels in a street not requiring repair. Due to these unique factors for concrete streets,analyses which predict future needs of this system tend to be less accurate then asphalt surfaces. However like unimproved streets and bike paths we can provide a current condition of this system. Past repair for these streets were primarily provided by City maintenance crews which consisted of panel replacements for the worst deteriorated panels. Historical construction data indicate that 60percent of concrete streets are over 70 years in age. Based on past maintenance repairs these streets over time may have had a majority of panels replaced. By the end of the 2017 Bond Measure (2023), approximately 17 lane miles (six centerline miles) of concrete streets will have been rehabilitated from the past and current funding sources. An estimated $5 million will be spent on approximately seven lane miles of concrete streets through the new bond measure. % Condition of Concrete System by Functional Class 2017 30.00 25.00 20.00 Arterials 15.00 Collectors Locals 10.00 5.00 0.00 FailedSeriousVery PoorPoorFairSatisfactoryGood 20