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    The Fortress

    This reflects the 10Adventures difficulty rating for each route. We aim to keep ratings consistent across regions.
    This reflects the estimated time the majority of users will take on this trail. If you are slower, add time to the top-end figure. If you are fast, then you may complete this route faster than this time range.
    This reflects the return distance of this route as measured by the GPS file.
    18.0 km
    This reflects the total elevation gained throughout this route as measured by the GPS file. This includes all ascents and descents, and is higher than what is quoted in most route guides, which simply measure the distance between the starting-point and high-point of the route.
    1,104 m
    User Ratings
    These ratings are completed by users who have completed this trail and not subject to reviews by 10Adventures.
    Overall Rating
    This is the average user-submitted overall rating on a scale of 1 to 10, with 10 being the highest.
    Physical Difficulty
    This is the average user-submitted rating on the physical difficulty of this route. In general, green is beginner, blue is intermediate, black is advanced/most difficult and double-black is expert-only. It is recommended that users build up to black and double-black routes.
    Advanced (Diamond)
    Suitable for advanced experience level looking for a solid adventure.
    Technical Difficulty
    This is the average user-submitted rating on the technical difficulty of this route. In general, green is beginner, blue is intermediate, black is advanced/most difficult and double-black is expert-only. It is recommended that users build up to black and double-black routes.
    Intermediate (Square)
    Suitable for intermediates who are ready for a little bit more adventure.
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    Directions to Trailhead
    Panoramic views from the Fortress scramble in Kananaskis, the Canadian Rockies

    The Fortress is aptly named for its ominous appearance from Highway 40, however a scramble to the summit can be fairly easily achieved via two ascent routes. The scramble to the top of the Fortress is not only fun, but also provides a stunning view!

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    Route Description for The Fortress

    The Fortress can be ascended via either the Headwall Lakes or Chester Lake trails; we chose to ascend via Headwall Lakes and descend via Chester Lake. This loop option is only marginally longer than a direct in-out ascent via Chester Lake (the shorter direction) and would allow us to avoid the hordes at Chester Lake for half the trip as well as provide a bit of scenic variety.

    We started hiking on the Headwall Lakes trail around 8:30 am, making quick work of the first 3.0 km or so of trail that follows a snowshoe route/road that runs nearly parallel to the Spray Lakes Road until it reaches Headwall Creek. We crossed the creek on a new bridge, then after a short ascent on the snowshoe trail/road, picked up the good trail heading up Headwall Creek. It’s marked by two cairns, flagging, and a trail camera, and the snowshoe trail/road has a line of rocks across it to discourage zombie hikers from going too far.

    The trail was in very good shape and any area that had been affected by the 2013 flood was well cairned, although these sections were so short that cairns weren’t really necessary. We had been expecting greater damage and route finding difficulties since we had heard of a few groups getting lost on the trail, but the trail was about as obvious as possible without being a veritable highway like the path to Chester Lake.

    We reached the lakes after about two hours of easy hiking, then continued to the base of the Headwall-Chester col to have a snack in the sun; the Headwall Lakes valley had been entirely shaded and subsequently cool as we’d passed through. After lunch we started up the rubble to the col, which we reached in just 30 minutes. The rubble is not fairly easy as far as rubble goes!

    From the col it was an easy plod to the base of the summit block where we had to scramble up a 3 m cliff band to reach the summit. The scramble was mildly awkward as the boulders just weren’t in the right places! The view from the top was spectacular, and while it was smoky, it wasn’t as bad as it has been for much of the 2018 summer.

    Despite a gusty wind on the summit we managed to eat lunch behind a small windbreak, then retraced our route back down to the col. Depending on the time of year, the descent down the Chester Lake side of the col will have you in soft, almost sandy, scree nearly the entire way down to valley bottom, or hard-packed mud with short sections of chunky scree! This time it was the latter and the descent was quite miserable, actually, and the kilometer of rock and boulder hopping through the valley bottom to reach nicer trail was equally annoying.

    We reached Chester Lake and the insane weekend crowds about an hour after departing the col, then quickly made our way down the trail and past dozens of others to the car. It was an easy and scenic way to spend the day!

    Insider Hints for The Fortress

    • The Chester Lake Trail is closed May to June 29th each year to prevent trail damage.
    • Get to the parking lot early as the Chester Creek parking lot fills up early on weekends.

    Getting to the The Fortress Trailhead

    The trailhead is located on the unpaved Highway 742, also known as the Smith-Dorrien Trail. From Canmore drive towards the Nordic Centre. Continue past the Nordic Centre and travel 41.0 km before reaching the parking lot. If coming from Kananaskis Lakes in the south, the distance is approximately 20.0 km.

    Route Information

    • When to do

      July - September

    • Backcountry Campsites


    • Toilets

      Several day use areas along highway 742

    • Pets allowed

      Yes - On Leash

    • Scarmbling Rating

      Grade 1

    • Exposure


    • Family friendly


    • Route Signage


    • Crowd Levels


    • Route Type


    The Fortress Elevation Graph

    Weather Forecast

    Check Area Weather

    The Fortress Reviews

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