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2010 ADA Standards for Accessible Design Pocket Guide

308.2 Forward Reach

308.2.1 Unobstructed.

Where a forward reach is unobstructed, the high forward reach shall be 48 inches (1220 mm) maximum and the low forward reach shall be 15 inches (380 mm) minimum above the finish floor or ground.

A side view is shown of a person suing a wheelchair reaching toward a wall.  The lowest vertical reach point is 15 inches (380 mm) minimum and the highest is 48 inches (1220 mm) maximum.

Figure 308.2.1 Unobstructed Forward Reach

308.2.2 Obstructed High Reach.

Where a high forward reach is over an obstruction, the clear floor space shall extend beneath the element for a distance not less than the required reach depth over the obstruction. The high forward reach shall be 48 inches (1220 mm) maximum where the reach depth is 20 inches (510 mm) maximum. Where the reach depth exceeds 20 inches (510 mm), the high forward reach shall be 44 inches (1120 mm) maximum and the reach depth shall be 25 inches (635 mm) maximum.

Figure (a) shows a person seated in a wheelchair reaching a point on a wall above a protrusion, such as a wall-mounted counter, which is 20 inches (510 mm) deep maximum.  The maximum reach height is 48 inches (1220 mm).
In figure (b), the obstruction is more than 20 inches (510 mm) deep, with 25 inches (635 mm) the maximum depth.  The maximum reach height is 44 inches (1120 mm).

Figure 308.2.2 Obstructed High Forward Reach

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