CFR › Title 23 › Part 774Part 774 — Parks, Recreation Areas, Wildlife and Waterfowl Refuges, and Historic Sites (Section 4(f))§ 774.1— Purpose.§ 774.3— Section 4(f) approvals.§ 774.5— Coordination.§ 774.7— Documentation.§ 774.9— Timing.§ 774.11— Applicability.§ 774.13— Exceptions.§ 774.15— Constructive use determinations.§ 774.17— Definitions.