Rapid Lake Trail

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.
11.6 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.
442 m
User Ratings
These ratings are completed by users who have completed this trail and not subject to reviews by 10Adventures.
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Directions to Trailhead

Discover the beauty of Idaho’s high country on the Rapid Lake Trail. This beautiful adventure explores a myriad of shimmering glacial lakes—boasting unrivaled scenery and ample opportunities to cool off. While this route demands some stamina, the payoff is worth the sweat.

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Route Description for Rapid Lake Trail

Contrary to its name, the hike to Rapid Lake is not so fast. Demanding at least a half-day commitment, this lovely path travels high into Idaho’s alpine, offering incredible scenery and a wonderful workout. Note much of the terrain is rocky and uneven, so wear a sturdy pair of footwear. Additionally, this excursion lacks proper sign postage in sections, so download the trail GPS in advance. Don’t forget to bring plenty of water to stay hydrated and dress in layers as insurance against changing conditions.

Setting out from the trailhead off Boulder Lake Road, you will take the leftmost trail that traces the northern shoreline of the Boulder Meadows Reservoir. Enjoy the scene of the beautiful pool, and the trail will eventually divert you away from the shoreline and into a swathe of woodlands. After some hiking, the path will again open, guiding you along the southern shore of Boulder Lake. At the east end of the lake, you will confront an intersection; merge onto the Kennally Creek Pack Trail here.

Beyond this point, the terrain will become increasingly rocky as you make your way up to Rapid Lake. Once at the lake, you will be granted impressive views of the surrounding granite mountainscape and the adorning lakes. Dip your tired feet in the chilly waters of Rapid Lake, then head back down to the trailhead the way you came.

Getting to the Rapid Lake Trail Trailhead

Access this hike from the trailhead off Boulder Lake Road.

Route Information

  • Backcountry Campground

    Backcountry Camping

  • When to do


  • Pets allowed

    Yes - On Leash

  • Family friendly

    Older Children only

  • Route Signage


  • Crowd Levels


  • Route Type

    Out and back

Rapid Lake Trail Elevation Graph

Weather Forecast

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Rapid Lake Trail Reviews

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