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All steps on a flight of stairs shall have uniform riser heights and uniform tread depths.  Risers shall be 4 inches (100 mm) high minimum and 7 inches (180 mm) high maximum.  Treads shall be 11 inches (280 mm) deep minimum.

Related Code Sections

504.2 General Site and Building Elements, Treads and Risers
All steps on a flight of stairs shall have uniform riser heights and uniform tread depths.  Risers shall be 4 inches (100 mm) high minimum and 7 ...
505.10.3 General Site and Building Elements, Bottom Extension at Stairs
At the bottom of a stair flight, handrails shall extend at the slope of the stair flight for a horizontal distance at least equal to one tread depth ...
505 General Site and Building Elements, Handrails
tread depth beyond the last riser nosing.  Extension shall return to a wall, guard, or the landing surface, or shall be continuous ...
1009.5.6 Recreation Facilities, Size
Each transfer step shall have a tread clear depth of 14 inches (355 mm) minimum and 17 inches (430 mm) maximum and shall have a tread clear width ...
1009.6.1 Recreation Facilities, Pool Stairs
Pool stairs shall comply with 504. EXCEPTION: Pool step riser heights shall not be required to be 4 inches (100 mm) high minimum and 7 inches ...