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The Longs Peak Map includes Longs Peak, Bear Lake, Glacier Gorge, Moraine Park and Wild Basin areas of RMNP. With a scale of 1:25,000, this sectional map provides much greater detail such as backcountry campsites, footbridges and water and snow hazards.

Rocky Mountain National Park Dayhiker's Guide describes 33 of the best day hikes in the park. Trails are cross-referenced with the RMNP Trails Illustrated topographic map.

Chasm Lake

Trail Features: Alpine Lake, Outstanding Panoramic Views chasm-lake
Trail Location: Longs Peak Ranger Station
Roundtrip Length: 8.5 Miles
Trailhead Elevation: 9405 Feet
Total Elevation Gain: 2500 Feet
Avg. Elev Gain / Mile: 588 Feet
Highest Elevation: 11,823 Feet
Trail Difficulty Rating: 13.50 (strenuous)
Parking Lot Latitude 40.27215
Parking Lot Longitude -105.55682

Trail Description:

The hike to Chasm Lake begins from the Longs Peak Trailhead. To reach the trailhead from Estes Park, drive 8.9 miles south on Colorado Highway 7 to the turnoff for the Longs Peak Ranger Station. From the turnoff drive another mile to the ranger station. Please note that parking is fairly limited, and the lot fills up very early on weekends. Additional parking is available along the roadside leading up to the trailhead, but is also quite limited. You may also want to note that car-camping isn't allowed in the parking area.

Due to the popularity of the hikes from this trailhead, the length of time to reach most destinations, exposure to afternoon thunderstorms, and limited parking, you'll definitely want to arrive as early in the morning as possible, especially on weekends during the summer months. Day hikers planning to summit Longs Peak usually arrive between 3 a.m. and 5 a.m.

Starting at an elevation of roughly 9405 feet, hikers will be following the East Longs Peak Trail for much of this hike.

Longs Peak is the highest point in Rocky Mountain National Park. The 14,259-foot peak is named after Major Stephen H. Long, who led an expedition across the Great Plains and along the base of the Rockies in 1820. While out on the plains, in the distant view, the expedition could see the highest mountain in the northern range. Although they never entered Rocky Mountain National Park, three members of the expedition would later become the first to climb Pikes Peak.

longs-peak and mt-lady-washingtonJohn Wesley Powell, along with several others including William Byers, the founder of Rocky Mountain News, would make the first ascent of Longs Peak in 1868. Powell, the one-arm Civil War General, would also become the first person to float the Colorado River through the Grand Canyon.

From the Longs Peak Ranger Station the trail begins a steep climb through a thick forest of lodgepole pine, spruce and fir. Roughly one-half mile from the trailhead hikers will reach the Eugenia Mine Trail junction, and at 1.2 miles will pass the short side trail that leads to the Goblins Forest Backcountry Campground (containing six individual campsites).

At roughly 2.2 miles from the trailhead, and an elevation of roughly 10,750 feet, hikers will finally emerge from the forest and enter the subalpine zone. Dominating the landscape along this stretch of trail is krummholz, a German word that means twisted wood, which describes the stunted and irregular growth patterns of trees found in the transition zone between forest and tundra. Mt. Meeker, Longs Peak and Mt. Lady Washington will also come into view at this point as well.

longs-peak-diamondAt just over 2.5 miles you'll reach the spur trail that leads to the Battle Mountain Backcountry Campsite (contains one group campsite). Beyond the junction the main trail leaves the subalpine zone and begins to ascend Mills Moraine.

At roughly 3.4 miles, and an elevation of 11,540 feet, hikers will arrive at the Chasm Lake Trail junction. From this point 13,281-foot Mt. Lady Washington will be the dominating feature towards the west. If needed, an outhouse is located here as well.

From the junction the Chasm Lake Trail travels southwest along the wall of a deep gorge that offers birds-eye views of Peacock Pool and Columbine Falls as you proceed towards the lake. Compared to the East Longs Peak Trail the grade along this stretch of trail is much more moderate. After skirting along the wall of the gorge the trail eventually passes over the top of the waterfall before emerging onto a small alpine basin.

After a brief walk through the basin the trail begins to climb sharply up the headwall that forms Chasm Lake. This section of trail requires a bit of route finding as well as some easy rock scrambling. Although there are cairns that follow different routes up this section, your most efficient route will likely be towards the right, heading almost straight up the draw. This section of “trail” ascends for roughly two-tenths of a mile before reaching the top of the wall where you'll finally enjoy your first views of Chasm Lake. The two photos below give an indication of where the route travels. In the photo on the left you can see the trail as it passes above Columbine Falls before ascending the headwall. The photo on the right offers a close-up view from the bottom of the draw:


Chasm Lake sits in a deep cirque at the base of Mt. Lady Washington towards the north and Longs Peak towards the west. The famous east-facing wall of Longs Peak, known as the "Diamond", rises more than 2,400 feet above this incredibly stunning and dramatic alpine lake. Looking towards the south is 13,911-foot Mt. Meeker. The Keyboard of the Winds is also visible from this vantage point. Much of the shoreline around the lake is accessible, however, some minor rock scrambling is required to reach some of the better vantage points.

chasm lake

The national park website provides additional information on hiking in the Longs Peak area, as well as general hazards you should be aware of while hiking in the high country.

If you still have the energy, plenty of time, and good weather, you'll have the option of continuing on to the Boulder Field and the Keyhole.