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cracking, patching, asphalt raveling, and transverse cracking in a given length of roadway. From these observations, the Pavement Surface Condition (PSC) rating is calculated. The rating is a scale of Oto 100 (Figure 16). Pavement Condition Index Very ood 80 -100 60 -80 Fair 40 -60 Poor 20 -40 Ve.ry PoQr 0 -20 Figure 16 PSC Rating Scale These ratings are used to evaluate treatment strategies, assess overall management of the roadway surface network, and inform future funding needs. As Figure 17 shows, pavement degrades in a non- linear fashion. Once pavement falls into the fair/poor categories, its condition rapidly degrades without maintenance intervention. The cost to bring a road into good condition or maintain it at this level escalates quickly as the roadway degrades. A road in good condition can be maintained with simple patching and sealing, whereas roads in fair condition may require an overlay, and very poor condition roads often require full reconstruction. Excellent ; Typical Pave rnef'/f . 0,.4 : 40% Drop · "'o _ Good : In Qualtty '<,7<) : '> Fair T _____ 75%ofltfe __ . -·-----•, Poor Very Poor 0 5 10 ' ,: 40% Drop : tn Quality : I 15 Years 20 Figure 17 National Standard Deterioration Curve for Pavement In addition to roadways, the other major asset that the County is responsible for is bridges. The state mandates a biannual review of all bridges to determine their condition. The result of this analysis is a rating of bridges to determine the condition of the structure and if they are functionally obsolete or structurally deficient. Of the 268 bridges under the county's jurisdiction, 60 have only timber railing or no railing at all, while several other structures require deck rehabilitation, scour repairs, railing improvements, painting, or structural concrete repa i rs. I ADMINISTRATION AND OPERATIONS Another critical component to keeping the County's transportation system functioning are the public works staff that administer and support the system by responding to emergencies, conducting maintenance activities, administering permits, and providing planning and engineering improvements to the system. I OTHER ROADWAY OPERATIONS Other roadway operations include the roadway elements such as traffic control and street lighting that keep the network operating efficiently. There are many other elements of County roads including shoulders, drainage features, walls, guardrail, signage, traffic signals and streetlights. Most of these elements have not had a systematic method of evaluating condition over time, with elements of the 42 IP a g e 25 30