Provide details for shear keys on abutment and bent caps of I-girder, U-beam, spread box beam (X-beam), and spread slab beam bridges that cross water features and meet any of the following criteria:

River and stream crossings: The distance between the bottom of the beam and the 100- year high water level, as shown on the layout, is less than 4 feet.
Tidally influenced bridges: Refer to the AASHTO
Guide Specifications for Bridges Vulnerable to Coastal Storms
for guidelines.