To request a ranger program at Dyke Marsh Wildlife Preserve call 703‑235-1530. Hours & Seasons. The grounds at Dyke Marsh Wildlife Preserve are open year-round from 6 am to 10 pm. Facilities. Restrooms, water fountains, and trash cans are located on the Mount Vernon Trail between the two large parking lots in Belle Haven Park. There are also restrooms, water fountains, and trash cans near the marina boat ramp.
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