Since 2018, thousands of Pacific newts have been recorded dead on Alma Bridge Road in Santa Clara County. This road bisects the largest known population of Pacific newts’ upland forest habitat and breeding grounds near Lexington Reservoir, resulting in one of the world’s highest reported rates of amphibian roadkill. Volunteers who first documented the mass mortality have observed a consistent decline in the number of dead newts recorded each rainy season. A simple linear regression of carcass counts versus year from 2018–2024 shows that road-killed newts per hour of volunteer effort have declined significantly at a rate of approximately 10% per year (P = 0.045). Simple and multiple linear regressions revealed no significant relationship between carcass counts and traffic volume or precipitation. Because roadkill declines typically reflect population declines when other factors remain constant, these results suggest the population may be approaching a crash. A mitigation plan is currently in progress; however, even if fully effective, it would not have prevented 9,633 recorded newt deaths between 2018 and 2024. We suggest that a mitigation timeline exceeding 10 years from problem recognition, while addressing less than 30% of the roadway where mortality occurs, may be typical but is not an appropriate response given the scale of mortality and population risk.