2018-165 Transportation Plan - Laserfiche WebLink

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it~2 B11:!JD6E11l·NG F.OR GOOD SfAiJ:E QFRIEPAltR The County evaluated its transportation system inventory and likely maintenance and preservation needs over the next 20 years. Below, each element of the County's inventory is described with annual expenditure needs summarized at the end. I PAVEMENT The primary type of paved roadway under Kittitas County's jurisdiction is Bituminous Surface Treated Road. Bituminous surface treatment (BST), also known as chip seal, is a lower-cost treatment that has a short design life of approximately 7 years. The county currently has 498-centerline miles of BST paved roadways that are in fair to very good condition (PSC more than 40). Performing an overlay of a BST roadway is approximately $30,000 per centerline mile. Table 5, below, summarizes the annual investment need for pavement preservation based on this inventory. 75 miles of paved roadway are chip sealed each year under the current maintenance schedule. With a total of 498 miles of roadway this means that the entire network is maintenanced every 7 years, which is the design life of a chip seal treatment. Consistent with Goal 5 of Sustainably Funded and Maintains What We Have, this plan recommends continuing the current maintenance schedule and associated expenditures to keep the roadways in good repair. I GRAVEL ROADS While paved roads make up the majority of the County road network, Kittitas County also maintains 64 miles of gravel roads. While gravel is less expensive than chip sealing, gravel roads only have a design life of one year and must be maintained more frequently. Historically the County has budgeted enough to perform the necessary annual maintenance to keep all of the gravel roads in good repair and it is recommended that this maintenance plan continue. l OTHER SUPPORTING INFRASTRUCTURE While pavement preservation is the primary cost related to County roads, there are other important elements to consider, including shoulders, culverts and drainage features, pedestrian facilities, guardrail, concrete barriers, signals and signage. Table 5 summarizes costs associated with these and other maintenance preservation activities over the life of this plan. I OPERATIONAL EXPENDITURES There are a variety of regular operations that must take place to keep the transportation network in good repair. These include vegetation control, snow and ice control, and the operations associated with pedestrian crossings, paths and trails, and litter clean up. I BRIDGES As described earlier, there are 268 bridges under Kittitas County's jurisdiction and ten are considered functionally obsolete or structurally deficient. To protect the safety and continued mobility of Kittitas County residents and businesses, this Plan recommends continuing the current practice of rehabilitating one bridge each year. It is assumed that the cost to rehabilitate a bridge is approximately $2 million, a conservative estimate to ensure that enough funds are available to cover all project costs and any unforeseen costs. Currently the majority of this cost is being borne by the County, so assuming no outside funding the cost to the County of retrofitting these bridges would be approximately $20 million over the next 10 years. In addition to the 10 identified deficient bridges, 97 bridges on the County's inventory will meet or exceed their 75-year design life within the 20-year horizon of this document. Continuing to prioritize and budget $2 million annually after addressing the 10 deficient bridges provides enough money based on currently estimated costs to make substantial progress on these additional bridges as repairs are needed. The cost for bridge replacement is included in the project list in Table 11 (page 53). I MAJOR FINDINGS It is worthwhile to note that this analysis suggests that the County's historical investments in preservation, maintenance, and related operations are not sufficient to cover the expected operational costs for the next 20 years. The County will need to potentially consider additional funding sources for transportation in order to meet the operational 45 IP age