Tours & timed entry · North Dakota
Garrison Dam Power Plant Tours — tickets & tours bookable on Recreation.gov, at Sakakawea Lake. Official listing facts below, plus how its release and cancellation patterns work.
The Garrison Dam was completed in 1954 and holds back the waters of the Missouri River creating the third largest manmade reservoir in the United States. The reservoir known as Lake Sakakawea is 178 miles long and up to 14 miles wide in places. The Garrison Dam itself is 2.5 miles long and 210 feet high and.5 miles wide at its base.
| Type | Tickets & tours — bookable on Recreation.gov |
|---|---|
| Area | Sakakawea Lake |
| Managed by | US Army Corps of Engineers |
| Location | Riverdale, North Dakota |
| Phone (official listing) | 701-654-7411 |
| Official listing | Recreation.gov — Garrison Dam Power Plant Tours |
Tickets and timed-entry inventory on Recreation.gov follows the same physics as campgrounds: a listing-defined release pattern, carts that hold for about fifteen minutes, and sold-out dates that return when plans change — because every ticket in this system can be cancelled, and cancelled inventory comes straight back to the calendar, first-come. The listing text above is the authority for this facility's exact window; our release- windows guide shows how to read any listing's pattern, and how cancellations work explains why "sold out" is a snapshot rather than a verdict.
Planning the wider trip? The park guide ties this listing to the area's campgrounds, guides, and season notes.
On Recreation.gov, via the official listing linked in the facts table. itOpened never takes bookings — we publish the data and watch the calendars.
Timed-entry and ticket inventory recycles: abandoned carts return after about fifteen minutes, and cancellations return dates first-come, all season. Re-check at release times and in the final days before your date.
The official listing classifies it as 'Ticket Facility' — the facts table carries the listing's own description of what's included.
Every figure in this article traces to one of the sources above. If a number isn't sourced, we don't print it.
Last updated 2026-10-30.