... methods for inspection of cracks, and ultrasonic methods for inspection of cracks or corrosion loss. 3- 5. Critical Area Checklist For the periodic inspection of any hydraulic steel structure, ... (3) Connections at ends of diagonal members (high stress, fracture critical). 3- 6. Inspection Intervals The maximum time interval between periodic inspections of hydraulic steel structures ... inspected structures, date and time of inspection, type of inspection, inspection procedure, inspection equipment, inspector identity and qualifications, and a record of discontinuities detected that...