Criteria in this section are not intended for C-shaped bents or through-girder bents.

Cap depth cannot be less than cap width unless the cap is widened for the purposes of:

meeting minimum support length per Article 4.7.4.4
accommodating a cap-to-column connection when one or both elements are precast
satisfying vertical clearance needs to a lower roadway

See Chapter 4 – Substructure Design, Section 4 - Rectangular Reinforced Concrete Bent Caps, for minimum cap widths as well as column and drilled shaft dimensions based on beam or girder type.