Odessa Lake, Bear Lake Trailhead, Rocky Mountain National Park, Colorado

Odessa Lake - 8.3 miles

Bear Lake Trailhead

Odessa Lake

Odessa Lake

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Round-Trip Length: 8.3 miles
Start-End Elevation: 9,475' - 10,055' (10,692' max elevation)
Elevation Change: +580' net elevation gain (+1,912' total roundtrip elevation gain)
Skill Level: Moderate
Dogs Allowed: No
Bikes Allowed: No
Horses Allowed: Yes
Related Trails:

Odessa Lake - 8.3 Miles Round-Trip

Odessa Lake is located 4.15 miles from the Bear Lake Trailhead in Rocky Mountain National Park. It lies in a steep valley hemmed in by The Little Matterhorn, The Gable (11,939') and Joe Mills Mountain. Hikers will enjoy alpine landscapes and excellent fishing at Odessa Lake:

Trail Map | Photo Gallery

The trail rises quickly over Bear Lake through young aspen to the Odessa Lake - Mill Creek Basin split (.45 miles : 9,725'). It climbs steadily to the Flattop Mountain Trail junction (1.0 mile : 9,965'), beyond which grades steepen up a notably rocky path.

The trail negotiates a short but steep-sided scree field through the vestiges of treeline to the Sourdough Campsite spur (2.65 miles : 10,585').

It crests past the campsite and drops gently to several unmarked spurs for Lake Helene (3.0 miles : 10,610'). Remain vigilant, as spurs are unmarked and fairly easy to miss.

Lake Helene fills a shallow depression fed by the glacier-laden slopes of Flattop Mountain (12,324'), Ptarmigan Point (12,363') and Notchtop Mountain (12,129').

The trail makes a sharp hairpin turn (north) past Lake Helene, around and down the west flank of Joe Mills Mountain. Knobtop Mountain (12,331'), Little Matterhorn (11,586'), and the deep valley below come into view as the trail runs down rugged, open talus to the Odessa Lake access spur (4.0 miles : 10,035').

Bear left and follow the outlet stream to Odessa Lake (4.15 miles : 10,055'). Odessa Lake's east shore is cluttered, but those with time can find social trails leading to its secluded and exceptionally attractive west shore. Be mindful of changing weather and remember that you must climb 637' back through treeline on the return hike to Bear Lake.

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Key GPS Coordinates - DATUM WGS84

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  • N40 18.716 W105 38.761 — 0.0 miles : Bear Lake Trailhead
  • N40 19.051 W105 38.638 — .45 miles : Mill Creek Basin junction - begin loop
  • N40 18.987 W105 39.185 — 1.0 miles : Flattop Mountain Trail junction
  • N40 19.357 W105 40.359 — 2.25 miles : Trail levels across scree field
  • N40 19.383 W105 40.732 — 2.65 miles : Sourdough Backcountry campsite spur
  • N40 19.238 W105 41.142 — 3.15 miles : Lake Helene
  • N40 20.024 W105 40.975 — 4.0 miles : Odessa Lake access spur
  • N40 19.901 W105 41.058 — 4.15 miles : Odessa Lake

Worth Noting

  • Lingering snow can mask the narrow trail and create hazardous footing on the descent from Lake Helene to Odessa Lake. Exercise caution when traveling over these steep, rocky slopes.

  • Odessa Lake is a popular angling and camping destination with limited space. Plan trips in advance.

Camping and Backpacking Information

The following backcountry campsites are accessible from the Bear Lake Trailhead. Permits are required for all overnight stays. Fires are not permitted within Rocky Mountain National Park. Camp safely away from dead trees, as close as possible to the silver metal arrowhead posted at each site. Red arrowheads on trees provide additional guidance to each campsite from the main trail:

    Sourdough Backcountry Campsite (10,628')
  • There is one designated site located 2.65 miles from the Bear Lake Trailhead, 60 yards north of the main trail on the south flank of Joe Mills Mountain. The site is located in a level spruce bench. One bear box is available. Water is available from the North Fork of Mill Creek, Lake Helene and Two Rivers Lake.

  • Odessa Lake Backcountry Campsite (10,065')
  • There are two designated sites located 4.1 miles from the Bear Lake Trailhead in a spruce-fir stand east of Odessa Lake on the north side of its outlet stream. The sites are located just over the log bridge crossing of this stream. One bear box is available. Water is available from Odessa Lake and its outlet stream.

  • Fern Lake Backcountry Campsite (9,530')
  • There's one group site and four individual sites located 5.1 miles and 5.3 miles from Bear Lake Trailhead, respectively. Both are located in a mixed pine forest on the NE and NW sides of Fern Lake, respectively. Each has access to a bear box + privy. Water is available from Fern Lake and its inlet - outlet streams.

Fishing Information

  • A valid Colorado fishing license is required for all persons 16 years + to fish in Rocky Mountain National Park. No other permit is necessary, however special regulations may exist for each location. It's your responsibility to know and obey them. Regulations may change at anytime. Special restrictions may be put in place above and beyond what's listed here. Contact the Park before your trip for current information.

  • Odessa Lake is a catch and release only area: No bait or worms are allowed in catch-and-release waters.

  • Certain waters in the park with restored native fish populations are open year round during daylight hours, except as indicated. Use barbless hooks only. Any and all fish species taken must be immediately returned to the water unharmed.

  • Method of Capture: Each person shall use only one hand-held rod or line. A 'second rod stamp' is not honored in park waters. Only artificial lures or flies with one (single, double, or treble) hook with a common shank may be used. "Artificial flies or lures" means devices made entirely of, or a combination of, materials such as wood, plastic, glass, hair, metal, feathers, or fiber, designed to attract fish.

  • This does not include: (a) any hand malleable material designed to attract fish by the sense of taste or smell; (b) any device to which scents or smell attractants have been externally applied; (c) molded plastic devices less than 1.5 inches long; (d) foods; (e) traditional organic baits such as worms, grubs, crickets, leeches, minnows, and fish eggs; and (f) manufactured baits such as imitation fish eggs, dough baits, or stink baits. Fly fishers may utilize a two hook system, where one hook is used as an attractant.

  • While in possession of any fishing equipment, bait for fishing (insects, fish eggs, minnows, or other organic matter) or worms is prohibited. Children 12 years of age or under, however, may use worms or preserved fish eggs in all park waters open to fishing except those designated as catch-and release areas.

  • Use of lead sinkers (or other lead fishing materials) is strongly discouraged.

Rules and Regulations

  • Horses are not permitted on the Odessa Lake access spur.

Directions to Trailhead

The Odessa Lake is accessible from the Bear Lake Trailhead, 8.9 miles from the Beaver Meadows Entrance Station in Rocky Mountain National Park.

Just past the Beaver Meadows entrance station, turn left onto Bear Lake Road. The Bear Lake Trailhead is located at the end of this road. Additional parking and alternative access can be found at the Glacier Gorge Trailhead. This will add an additional 1 mile roundtrip to the hike.

Contact Information

Rocky Mountain National Park
Visitor Information:
970.586.1206

Backcountry Office:
970.586.1242

Campground Reservations:
800.365.2267

Emergency Dispatch:
970.586.1203

Trip Reports

There are no trip reports on this trail.



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