- This article is for the mountain range in Montana. For the small mountain range in British Columbia, Canada, also known as Mission Mountain, see Mission Ridge (British Columbia). For the summit in California see Mission Peak.
Looking towards McDonald Peak, high point of the Mission Mountains, rising above McDonald Lake
|Elevation||9,820 ft (2,990 m)|
The Mission Mountains or Mission Range are a range of the Rocky Mountains located in northwestern Montana in the United States. They lie chiefly in Lake County and Missoula County and are south and east of Flathead Lake and west of the Swan Range. On the east side of the range is the Swan River Valley and on the west side the Mission Valley.
The highest point in the Mission Mountains is McDonald Peak 9,820 feet (2,990 m).  The range is named for its proximity to the Jesuit St. Ignatius Mission established in the mid-19th century in what is today St. Ignatius, Montana.
The Mission Mountains are composed largely of what is called "Belt Rock" from the Belt Supergroup. The sedimentary rocks in this group formed between 1.47 and 1.4 billion years ago in the Belt Basin. The roughly circular basin collected sediments from surrounding areas for millions of years. The basin was eventually buried and later re-exposed through the collision of several tectonic plates around 80 million years ago. 
Much of the Belt Rock found in the Mission Mountains is a crumbly sedimentary rock known as mudstone. The mudstone in the Belt supergroup is often characterized by mudcracks, which points to it being formed while wet, drying, cracking then and being repeatedly flooded with new wet material that also dried and cracked.
Most of the rock in the Mission Mountains hails from the end of the Proterozoic Eon, towards the end of what is called Precambrian time.  Because they are so old, the only evidence of life in the rocks are algae blooms and very basic plant fossils. These organisms played, however, the important role of converting carbon dioxide in the water into oxygen that was pumped into the acidic and poorly oxygenated atmosphere. 
The color of the mudstone in the Missions has much to do with the presence of the mineral hematite during the its formation. Hematite is formed by iron particles' reaction to oxygen in the atmosphere. Green and gray stones found in the Missions were most likely formed in deep water, the red in more shallow water.  Ripple marks can be found in much of the rock; they would have formed mostly in shallow water with gentle waves. 
The features of the Mission Mountains strongly reflect work of the last few ice ages, the latest of those being just over 10,000 years ago. But the range is also the product of a much longer story, one that can be started with the breakup of the Pangaea supercontinent. As the continents began to spread out, the North American Plate inched westward, grinding over and against the Pacific Plate as it went. This subduction of the Pacific Plate caused the rise of the Rocky Mountains and thereby the Missions. 
About 66 million years ago, this process of uplift began to slow. This time, called the Cenozoic Era, is when the area began to look much like it does today. Looking at the globe at that time, the continents would have been about where they are today and plant and animal life would be recognizable. At that time, however, the deep valleys of western Montana would not yet have formed.
This development is believed to have come about 40 million years ago as the extensional forces that cause the uplift of the Rockies began to cause the crust to thin and crack. Near-vertical faults formed almost uniformly throughout the region, most trending northwest to southeast. The blocks then broke up, some dropping and creating valleys like the Flathead and the Swan. In all, the whole process took around 100 million years. 
Three million years ago, at the end of the Cenozoic Era, western Montana would have been full of tall mountains, but it was the next geologic process that made them what they are today. Large glaciers began to form in the area 2–3 million years ago; this was the beginning of the Pleistocene Epoch. Since then, ending just 10,000 years ago, the Mission Mountains and their surroundings were shaped by water. 
The formation of the Flathead Lobe of the Alberta Cordilleran ice sheet is what set this history into motion. At its thickest points, the Flathead Lobe glacier may have extended 4,000 feet above the valley floor. The glacier reached hundreds of miles down the Rocky Mountain Trench, ending as far south as St. Ignatius, Montana.  At the northern end of the range, the glacier flow split, part flowing slowly into the Swan Valley. 
A view of the area at that time would have been majestic, with large glaciers flowing around both sides and partially over the range. Smaller glaciers would have also flowed out of the mountains and joined the larger one in the valley.  This explains the southward pointed hook-shaped ridges at the end of each canyon in the range.
These processes also gave the Mission Mountains their distinct shapes. The many three-sided peaks, called horns or pyramidal peaks, and the knife-like ridges of the southern half of the range are results of the heavy mountain glaciation. The northern half of the range was largely rolled over by the Flathead Lobe, which was much like a huge moving ice sheet. This led to the shorter, more rounded features of the northern half of the range. 
The Pleistocene was a time of dramatic and quick sculpting in the Mission Mountains. And though that epoch has ended, the erosion continues. Rain, snow, ice, wind and other forces continue to work at the alpine landscape of the Missions.
Recorded human contact with the Mission Mountains began with the native peoples thousands of years ago and runs up to the present. The Salish and Kootenai people have traditionally used the mountains as a place for fishing, hunting, berry-picking and for performing sacred ceremonies. 
The first major outside attention to the Mission Mountains came in the 1920s. Forest service employee Theodore Shoemaker led several parties of visitors thorough the range between 1922 and 1924, one of which included members of the Great Pacific Railway Company, which owned a great deal of land in the range. On a 1923 trip Shoemaker triangulated the locations of several peaks, which led to the first map of the high country. 
The first major protective action for the Mission Range came on October 21, 1931 when 67,000 acres of land along the east side of the Mission Divide was classified as the Mission Mountains Primitive Area. The Great Pacific Railway Company owned 30 percent of this land at the time of the classification, which was exchanged over the course of years for other land in the Flathead National Forest. 
Further stories about the Mission Mountains and the surrounding area can be found in the local books, In the Shadows of the Missions and Indian Trails and Grizzly Tales.
As most of the Mission Mountains fall under special protection, land use is limited largely to recreation.
The best time to hike in the Mission Mountains is between the beginning of July and October. Winter ends late in the high country and even in the beginning of July hikers will often find high passes and lakes snow-covered and wet. Snow starts to fly as early as October and hiking season is over by the end of the month. Winter recreation is best in the spring months. June is wet, but between February and May one can do some great winter camping, snowshoeing and skiing.
Hikers unfamiliar with the range should know that only a few of its hikes are "easy". The terrain, especially in the south is very steep and trails are not always kept clear. If you leave the trail and start scaling the rocks you will find out quickly that 1.5-billion-year-old mudstone is very brittle and not a very reliable handhold. Climb around with caution. In the daytime it can be very hot, but nights are very cold, so pack accordingly. Though the Missions aren't huge, it is always a good idea to bring a map. The USGS topographic maps of the area are available at local sporting goods stores and not a bad thing to have in your pack.
Because the range is a protected wilderness area, motorized trail bikes, motorcycles, three- and four-wheelers, snowmobiles, hang-gliders and mountain bikes are not permitted. Getting caught with one will result in a ticket.
The range has about 45 miles of official trails. Experienced hikers can, however, break off onto the plethora of game and Indian trails that often cut through the rougher terrain. Horses can be taken used on most official and some other trails, but Missions are a rough and before riding in the Missions riders should consult local experts. People wishing to take horses into the range need to consult the Flathead National Forest requirements, which include hay restrictions and other rules. 
Non-tribal members passing through land belonging to the Confederated Salish and Kootenai Tribes are required to carry a valid tribal lands-usage permit, which can easily be obtained at local sporting goods stores. The pass is good for one year and allows access to the Mission Mountains, stretches of the Flathead River, among others.
The Mission Mountains have several overlapping protection areas. Much of the Mission Mountain Range is falls under the management of the Confederated Salish and Kootenai Tribes of the Flathead Nation.
Most of the range is also part of the Flathead National Forest, under which the Mission Mountains Wilderness is designated as a wilderness area. The wilderness area is in the Swan Lake Ranger District. The 73,877 acre wilderness was designation on Jan. 4, 1975 and is managed under the Wilderness Act of 1964.
The southern end of the Mission Mountains includes a large grizzly bear protection area which is usually closed to hikers from July thru September. This allows the bears to feed on lady bugs and cut worms, and attempts to keep bear-human contact to a minimum. 
The Mission Mountains have a wide range of flora and fauna. Mule deer, elk, white-tailed deer, mountain goats, moose, black bears, grizzly bears, coyote, wolverine, lynxs, bobcats and mountain lions have all been spotted in the range. Smaller animals found in the Missions include hoary marmots, yellow-bellied marmots, snowshoe rabbit, pica, chipmunk, squirrel, porcupine, muskrat, badger, skunk, beaver, marten, weasel, and mink. 
The most common trees found in the range are the ponderosa pine, western red cedar, douglas fir, western larch, western white pine, lodgepole pine, limber pine, whitebark pine, Engelmann spruce, alpine fir, grand fir, western larch, quaking aspen, alder, and Rocky Mountain maple. Cedars most often grow in the creek bottoms while others are spread throughout the landscape. 
Up in the higher reaches of the Missions one finds the alpine larch. Found between the elevations of about 6,500 feet-7,000 feet this tough little tree can be found all over the range, twisted and tangled along high ridges and surrounding its peaks.
A few major peaks in the Mission Mountains include: Daughter-of-the-Sun Mountain, Flat-Top, Glacier Peak, Gray Wolf Peak, Kakashe Mountain, McDonald Peak, Mount Calowahcan (formally Mt. Harding), Mountaineer Peak, Sonyelm, and West and East St. Mary's Peaks.
Lakes found in the range include: Ashley Lakes, Cold Lakes, Lake of the Stars, Lost Sheep Lake, Lucifer Lake, McDonald Lake (reservoir), Mud Lakes, Mullman Lakes, Rainbow Lake, Schwarz Lake, Summit Lake, and Terrace Lake, among others.
MISSION RANGE INFORMATION
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