This depends on many factors, including the following:
- Funding requirements: Some funding sources can only be used in certain areas or on certain streets (i.e. on Federal Aid System streets, on streets within US Census Bureau Census Tracts, etc.), and when those funds are used for projects, streets are selected accordingly based on the requirements of the funding source.
- High-Priority Repairs: Streets may be prioritized where recognized problems exist (i.e. failed culverts, structural problems, etc.) that could potentially endanger the travelling public.
- Upcoming utility projects: Street repair is prioritized such that areas that are slated for underground utility work are not be repaired until AFTER the utility work is completed.
- ADA Compliance: Street repair work may be prioritized to incorporate ancillary work as required to comply with the Americans with Disabilities Act.
- Economy of Scale: Due to the construction cost unit price increase that occurs when smaller projects are completed instead of larger projects, street projects are typically completed when larger amounts of funding have been accumulated. By funding larger projects at lower unit prices, more streets can be paved during a given project and available funding is spent in the most efficient manner.
- Pavement Condition Index (PCI) Rating: The City maintains an AASHTO-compliant pavement management system, which includes a visual assessment rating of every street segment in Shasta Lake. This rating, called a PCI Rating, is made on a 100-1 scale, with 100 being best. PCI Ratings are reevaluated and updated every five years and can be used when comparing streets to determine which street is more in need of repairs.
Typically, several of these factors combine for a single project, which leads to focused projects that meet the funding source requirements. Final determination of which streets are included in a given project is made by the City Engineer, under the supervision of the City Manager.