Known as the Heart Creek Bunker, Diefenbunker, Vault, and Bow Valley Bunker, the large caverns in Mount McGillivray are a unique hiking destination with a colorful history. Urban legend has it that the massive bunker was carved into the side of the mountain to house important government officials during the Cold War. The real reason for the “bunker”, however, was to store sensitive documents1. Due to budget constraints and humidity, documents were never stored here, but the caverns remain as a testament to the politics and paranoia of the late ’50s. An interesting place to visit year round.
The trail to the Bow Valley Bunker begins at the Heart Creek Parking lot, just off the Trans Canada Highway, across from Lac des Arcs. Look for the Trans Canada Trail marker on the west side of the parking lot (NOT the the Heart Creek Trailhead). If you pass an interpretive sign about black bears within a few metres, you’re on the right track. Continue through mixed forest to a gravel-bed gulley (200 m from the parking lot). The path has been re-established post floods and is easy to follow.
At the halfway point (~1 km from parking lot), you will cross another gulley. Continue through the forest on a fairly level trail, then go down a big hill. At the junction (marked with a Trans Canada Trail marker), turn left. At the next junction (also marked), turn left again. From here, it’s only 200 metres to the cavern entrance.
Bring bright headlamps so you may explore the 80′ x 25′ caverns2. There is also a smaller cavern that may have been meant to be a reception area or lounge3.
Allow 5-15 minutes to explore the caverns! We enjoyed some cocoa and cookies at the cave entrance after and watched a train go by Lac des Arcs below. This trail is a quick win when you want to try something new!
Bow Valley Bunker Trail At A Glance
SAFETY NOTE: The bunker entrance (and 100 metres of the trail before it) is on an avalanche slope. Do not do proceed if the slope is snow covered!
Distance: 3.8 km return
Elevation gain: 94 m
Chariot friendly: Yes
Directions from Calgary: Go west on Hwy 1 for 86 km. Take exit 105 (Lac des Arcs) and turn left. Continue straight to the Heart Creek Parking Lot.This is a fun hike to do on the way to or from Canmore as it’s quick and easy!
What’s your favorite hike in Bow Valley Provincial Park?