Not long ago SP member and deep snow trail-breaker extraordinaire Colonelpyat submitted the Mount Zirkel page. Included was his excellent photo:
"Looking west towards Big Agnes Mountain", taken from near the summit of Mount Zirkel:
I thought, "Hey, I climbed Big Agnes the first summer that I was in Colorado (1978). I can submit it to SP!" I may not remember much about the climb, but I can point you in the right direction, and can definitely say that the Mount Zirkel Wilderness is worth many visits.
I have no idea.
Raymond Ave, the author of a Mount Zirkel Wilderness guidebook and website responded to my email inquiry:
According to the Historic Guide to Routt County, Big Agnes Mountain was named by Robert McIntosh who prospected the area for gold in 1875. It didn’t really say who Agnes was. That’s all I know. I also know that the Historic Guide to Routt County said that Mt. Zirkel was named for an trapper who lived near the mountain, but in fact it was named for Ferdinand Zirkel who (according to documents from the US Geologic Survey) conducted petrographic analysis on some rock samples collected on a geologic exploration in the area in the late 1800’s – so I always take whatever I read in the Historic Guide to Routt County with a grain of salt.
A similar question to Routt National Forest Service office came up empty-handed. Web search hits turn up the name of a sleeping bag manufacturer in Steamboat Springs. So whoever Agnes was, in exactly what manner she was big, and why Robert McIntosh named a mountain after her remains a mystery.
That I can answer. It is in the heart of the Mount Zirkel Wilderness of north-central Colorado, north of Steamboat Springs. The peak is some 7 miles from the Gilpin Lake trailhead and more than 2 miles from the trail by the route my wife and I took. Slightly more than 12,000 feet high, it is seldom visited. On our two trips into this valley (1978 and 1989), both over long holiday weekends we didn't see anyone else once we left the trail.
The Gilpin Lake trail on the west side of the Mount Zirkel Wilderness provides access to Big Agnes Mountain.
The following is pasted from the above Forest Service link, regarding the road to the trailhead:
Drive west out of Steamboat Springs on Hwy. 40 approximately 2 miles and turn right on Elk River Road (County Road 129). Follow CR 129 about 18 miles to the Seedhouse Road (Forest Development Road 400; also CR 64) and turn right. Continue for about 10 miles to the end at the Slavonia trailhead parking. USE: Very Heavy
This road was affected by the Routt Divide Blowdown and is not open past Coyote Park as of 06/99. Users have to park in Coyote Park and walk in two miles on the road to get to the Slavonia trailhead.
The hike is through beautiful conifer and aspen groves towards Gilpin Lake. At about 1.5 miles there is a junction that heads north into Mica Basin. That route gives probable access to Big Agnes from the west, but we continued straight along the Gilpin Lake trail. About 1/2 mile before reaching Gilpin Lake we left the trail and followed Gilpin Creek into the stunning basin south of Big Agnes. These flower-filled Rocky Mountain meadows are of superb beauty. The views of the west face of Mount Zirkel are spectacular. There are several excellent areas to camp. An unnamed lake sits at the head of the cirque, at about 11,100'. See the Topo! map.
Big Agnes is easily climbed from this lake via the Southeast Ridge route. The Gold Creek Lake trail is one of several variations you can use to return to your car.
A full list of trails in the Routt National Forest can be found here.
Typically June through September. Road access to the trail head will be probably be limited in winter. The Forest Service has a current conditions page, which seems to be of limited usefulness.
Raymond Ave's website also has a current conditions page, with further relevant links.
Sawtooth Range from Big Agnes
The Forest Service Seedhouse Campground is located near the trail head. There is a $10 camping fee. The Forest Service link is not clear if that is per night or per stay, up to the 14-day limit.
Big Agnes is in the Mount Zirkel Wilderness of the Routt National Forest. Wilderness camping regulations apply.
This link provides full regulatory details: www.wilderness.net
Note that special regulations apply to backcountry camping near Gilpin and Gold Creek Lakes due to heavy use. From the above Forest Service site:
Due to the popularity and easy accessibility of this trail, this area receives some of the highest use of any area in this wilderness. This trail is not suggested if you are seeking solitude. Gilpin, Gold Creek and Three Island Lake trails are the most heavily used areas on the district. If seeking solitude, please refer to trails less heavily traveled. Overuse and abuse have led to implementing special regulations in hopes for revegetation. Regulations prohibit camping within 1/4 mile of the lake. Please camp elsewhere using low impact techniques or visit Gilpin Lake on day hikes.
Since reaching Big Agnes requires several miles of cross country travel through pristine wilderness, please follow Leave No Trace guidelines when in the area.
The joys of a mountain like Big Agnes are as much the privilege of hiking through such beauty as the climb itself. Let's help it remain that way for future visitors.
The following is pasted from the above Bureau of Land Management link, which I feel free to post here since it is my tax dollars at work: