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UN 9900

UN 9900

UN 9900

Page Type: Mountain/Rock

Location: Colorado, United States, North America

Lat/Lon: 38.84210°N / 105.6323°W

Object Title: UN 9900

County: Park

Activities: Hiking

Season: Spring, Summer, Fall, Winter

Elevation: 9900 ft / 3018 m


Page By: Sarah Simon

Created/Edited: Apr 6, 2010 / Apr 19, 2010

Object ID: 611209

Hits: 1741 

Page Score: 79.04%  - 10 Votes 

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Rocky summit area
Rocky summit area

This twin-cone-shaped peak rises abruptly out of the surrounding high prairie of southern Park County. This is a neat, petite, double-humped peak capped by rocky summit boulders made of red volcanic conglomerate, remnants of the ancient, giant Guffey Volcano. The peak is easily accessible and can be visited in all seasons. From the summit, the visitor can enjoy views of the nearby ranching country and soft, rounded hills as well as high country to 14,000 feet and beyond in the distance to the west and north.

Rank: 2,372nd highest peak in Colorado
Prominence: 320 feet
USGS Quad: Dicks Peak

Rank and Prominence Information Source: Lists of John

Getting There

UN 9900_Getting There Map

UN 9900 is east of CO Hwy 9, roughly 15 miles south of the town of Hartsel (which is located at the intersection of CO Hwy 9 and US Hwy 24). The peak is in far southern Park County near Thirtynine Mile Mountain, about 8 miles as the crow flies southwest of Eleven Mile Reservoir.

Red Tape

Threemile Mountain from the summit
Threemile Mountain from the summit
Breaking trail toward summit area
Breaking trail toward summit area

Very few rules govern your use of this part of the National Forest. There are privately-held ranches nearby, however; be mindful of avoiding private property. There is no fee to use this part of the National Forest and parking is free.


Lela among the summit area rocks
Lela among the summit area rocks
Northwest from the summit ridge
Northwest from the summit ridge

Immediately Surrounding the Peak
This peak is close to roadways and clean, reliable water sources are scarce. Camping right near the peak cannot be recommended.

US Forest Service Campgrounds
The National Forest Service has a large selection of campgrounds in and around the Lake George area.

Campground NameElevationSitesNightly RateReservations?Notes
Blue Mountain8,200 ft.21$12YesLess than 3 miles as the crow flies from the summit of Blue Mountain.
Spruce Grove8,600 ft.27$12NoLet the gurgling Tarryall Creek sing you to sleep.
Twin Eagles8,600 ft.9$8NoMust haul or purify drinking water.
Happy Meadows7,900 ft.8$12NoSituated along the South Platte River.
Round Mountain8,500 ft.16$12YesDrinking water, vault toilet and trash pickup.
Springer Gulch8,300 ft.15$12YesSituated within the Elevenmile Canyon; water, tables, fire grates.
Riverside8,000 ft.19$12YesSituated within Elevenmile Canyon; large grassy meadow with little shade.

Eleven Mile State Park
Colorado State Parks operates eight campgrounds near the Eleven Mile Reservoir, as well as 25 backcountry campsites accessible by foot or boat only. Visit this site for detailed information.

Weather & Seasons

Zone Forecast for Guffey, CO

Summer: The route can be a bit hot and dusty in the summer, but the road should be dry and accessible and the breezes on top pleasant.

Spring: The snowpack is less deep here than in the high country and melts out faster than higher areas to the west. None-the-less, expect post-holing through unconsolidated snow drifts in the trees.

Fall: The aspen coating the slopes of this peak and surrounding neighbors make this area a golden-hued heaven in the fall.

Winter: Thanks to proximity to both US Hwy 24 Colorado Hwy 9, as well as to “primary dirt roads”, this peak is accessible year-round, barring a major blizzard (the roads in this area are prone to wind-drifting). Expect some deep snow wallowing where the trees are thick during a winter ascent.


Threemile Mountain from the summitLela among the summit area rocksUN 9900_Getting There MapUN 9900Approaching UN 9900 from the northNorthwest from the summit ridgeRocky summit area
Breaking trail toward summit area