This study evaluates the functional condition of flexible pavement in the Los Tamarindos neighborhood of Portoviejo, Ecuador, applying the Pavement Condition Index (PCI) according to ASTM D6433-16. A total of 87 road segments were surveyed through detailed visual inspections and distress classification, and pavement deterioration was projected for five- and ten-year horizons using Markov chains under three maintenance scenarios: no intervention, crack sealing, and resurfacing. The predominant distress types identified included alligator cracking, block cracking, and longitudinal/transverse cracking. The deterioration modeling showed that resurfacing yields the greatest improvement in pavement performance and effectively extends service life compared to crack sealing or no maintenance actions. Based on PCI results and deterioration forecasts, a prioritized intervention plan was formulated using a multi-criteria decision framework integrated with GIS tools to support optimized technical and financial planning. The findings reinforce the usefulness of PCI as a reliable tool for municipal pavement management and highlight its value for urban road systems in contexts with limited technical capacity and budget constraints.