43 C.F.R. § 17.270
This section applies to recipients that operate, or that receive Federal financial assistance for the operation of programs or activities involving recreation.
(a) Accessibility in existing recreation facilities. In the case of existing recreation facilities, accessibility of programs or activities shall mean accessibility of programs or activities when viewed in their entirety as provided at § 17.217. When it is not reasonable to alter natural and physical features, the following other methods of achieving accessibility may include, but are not limited to:
[47 FR 29546, July 7, 1982, as amended at 68 FR 51377, Aug. 26, 2003]