Home › CFR › Title 23 › Part 77423 CFR Part 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.