Wyoming · Yellowstone National Park · Geyser

Semi-Centennial Geyser

63 mi from Bozeman · ~1.8 hr drive

Semi-Centennial Geyser is a geyser catalogued in Wyoming by the U.S. Geological Survey's Geographic Names Information System — about 63 miles from Bozeman, MT, inside Yellowstone National Park. Coordinates and the closest documented metro are listed below; for current access and soaking rules, check with the relevant land manager before visiting.

Safety & access

Read before visiting

Verify access before driving in. The U.S. Geological Survey catalogs the geographic feature, not its access status. Hot springs in our database span the full range from developed public soaking pools to private resorts to wild thermal water on federal/state land. Some require entry fees; some are on private property; some are in National Park Service units where soaking is prohibited.

This feature is inside Yellowstone National Park and is federally protected. Stay on designated boardwalks and trails — leaving them damages fragile thermal-features and is illegal. Soaking is prohibited in most NPS thermal areas.

Water in geysers and boiling springs reaches well over 180 °F (82 °C) and can scald instantly. Never enter the water. Steam itself can cause burns.

Before you go: check current conditions and access rules with the relevant land manager — National Park Service unit, U.S. Forest Service ranger district, Bureau of Land Management field office, state-park department, or the property owner if it's private. Wild thermal water can be unsafe to enter without a thermometer; surface temperatures can vary dramatically from the deeper pool. When in doubt, don't soak.

State: Wyoming
Nearest city: Bozeman, MT · 63 mi · ~1.8 hr drive
Type: Geyser
Coordinates: 44.7861°, -110.7399°
Park: Yellowstone National Park (NP)
County: Park
GNIS ID: 1594093

From Wikipedia: Semi-Centennial Geyser is located just north of Roaring Mountain in Yellowstone National Park in the U.S. state of Wyoming. Situated next to the Grand Loop Road, the geyser was first noticed when it had a few small eruptions in 1919. A few years later at 6:40am on August 14, 1922 the geyser erupted in the first of a series of increasingly violent eruptions. By the afternoon on the same day reports stated that the ejected water was exceeding 300 feet (91 m) in height. By the evening of the 14th, the geyser had scattered debris and rocks a distance of 450 ft (140 m) from the crater. Short lived, Semi-Centennial Geyser has been quiet since and a small pool of water now exists where the geyser erupted. As the geyser showed its biggest activity in 1922, the 50th anniversary of the establishment of Yellowstone National Park in 1872, it was accorded the name of Semi-Centennial. Excerpt from the Wikipedia article on Semi-Centennial Geyser, available under CC BY-SA 4.0.

About Yellowstone National Park

National Park Service unit

Semi-Centennial Geyser is inside Yellowstone National Park, a U.S. National Park managed by the National Park Service. Conditions, road status, trail closures, boardwalk routing, and reservation requirements are published directly on the park's NPS page — check it before driving in, especially in winter.

Entrance fee: $35 per vehicle. Per vehicle, valid 7 days. Combined Yellowstone + Grand Teton pass available. An America the Beautiful annual pass ($80) covers entrance to all NPS units and is worth it after ~3 park visits per year.

Park homepage: https://www.nps.gov/yell/

Visiting Semi-Centennial Geyser

Trip planning

The exact location is at 44.7861°, -110.7399° — open in Google Maps for driving directions from your location.

If you've visited Semi-Centennial Geyser and have current notes (parking, access, soaking rules, fees, ownership), tell us at /contact — we update pages as we learn more.

Stay nearby

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Driving in? The nearest documented metro is Bozeman, MT — 63 miles away (~1.8 hr drive). See accommodation in Bozeman on Booking.com → RoamFound earns a small commission if you book through this link, at no extra cost to you. How we handle affiliate links.