Civil Structural Health Monitoring Workshop. Berlin. Germany. 2012. Report. A fracture-critical highway bridge with active cracks was monitored using strain gages to determine the number and amplitude of stress cycles under service loads. The measured response was used to estimate the remaining fatigue life of fatigue-sensitive members. Previous calculations based on a deterministic approach revealed that the fatigue life had long been exceeded. Due to the scatter inherent in the fatigue data, a probabilistic approach for estimating the remaining fatigue life was developed. The probabilistic method allows a bridge owner to weigh the risk of maintaining a bridge past its design service life.