The Trinity Alps near Granite Lake
|Elevation||9,025 ft (2,751 m)|
|Length||249 km (155 mi) |
|Width||181 km (112 mi) |
|Area||25,595 km2 (9,882 sq mi) |
|States||Oregon and California|
The Klamath Mountains are a rugged and lightly populated series of mountain ranges in northwestern California and southwestern Oregon in the western United States. They have a varied geology, with substantial areas of serpentine and marble, and a climate characterized by moderately cold winters with very heavy snowfall and warm, very dry summers with limited rainfall, especially in the south. As a consequence of the geology and soil types, the mountains harbor several endemic or near-endemic trees, forming one of the largest collections of conifers in the world. The mountains are also home to a diverse array of fish and animal species, including black bears, large cats, owls, eagles, and many species of salmon. Millions of acres in the mountains are managed by the United States Forest Service.
Physiographically, the Klamath Mountains include the Siskiyou Mountains, the Marble Mountains, the Scott Mountains, the Trinity Mountains, the Trinity Alps, the Salmon Mountains, and the northern Yolla-Bolly Mountains. They are a section of the larger Pacific Border province, which in turn is part of the Pacific Mountain System (Pacific Coast Ranges) physiographic division.
The three highest peaks in the Klamaths are Mount Eddy in Siskiyou County, California, at 9,025 feet (2,751 m), and Thompson Peak and Mount Hilton in Trinity County, California, at 9,001 feet (2,744 m) and 8,934 feet (2,723 m), respectively. The northernmost and largest sub-range of the Klamath Mountains are the Siskiyou Mountains.
Protected areas 
A large portion of the Klamath Mountains is managed by the United States Forest Service. Several national forests lie in the Klamath Mountains region, including the Shasta-Trinity National Forest, Siskiyou National Forest, Klamath National Forest, Six Rivers National Forest, and Mendocino National Forest.
There are extensive hiking trail systems, recreation areas, and campgrounds both primitive and developed in the Klamaths. A 211-mile (340 km) stretch of the Pacific Crest Trail (PCT) passes through these mountains as well. This section of the PCT is known locally as "The Big Bend" and is the transition from the California Floristic Province to the Cascades.
The rocks of the Klamath Mountains originated as island arcs and continental fragments in the Pacific Ocean. The island masses consisted of rifted fragments of pre-existing continents and volcanic island masses created over subduction zones. These island masses contain rocks as old as 500 million years ago, in the early Paleozoic Era. A succession of eight island terranes moved eastward on the Farallon plate and collided with the North American plate between 260 to about 130 million years ago. Each accretion left a terrane of rock of a single age. During the accretion, subduction of the plate metamorphosed the overlying rock and produced magma which intruded the overlying rock as plutons. Serpentinite, produced by the metamorphism of basaltic oceanic rocks, and intrusive rocks of gabbroic to granodiorite composition are common rocks within the Klamath terranes.
As a consequence of the geology, the mountains harbor rich biodiversity, with several distinct plant communities, including temperate rain forests, moist inland forests, oak forests and savannas, high elevation forests, and alpine grasslands. These communities form the Klamath Mountains ecoregion. One of the principal plant communities in the Klamath Mountains is Mediterranean California Lower Montane Black Oak-Conifer Forest.
The ecoregion includes several endemic or near-endemic species, such as Port Orford cedar (Chamaecyparis lawsoniana), Foxtail pine (Pinus balfouriana spp. balfouriana), and Brewer spruce (Picea breweriana), forming one of the largest collections of different conifers in the world. The flowering plant Kalmiopsis leachiana, also endemic to the Klamaths, is limited to the Siskiyou Mountains in Oregon.
A large concentration of diverse coniferous species of trees exists in these mountains. Thirty conifer species (or more depending on where one delineates the region) inhabit the area, including two endemic species Picea breweriana and Chamaecyparis lawsoniana, making the Klamath Mountains one of the richest coniferous forest regions of the world—in terms of concentrated species diversity. The region also has several edaphic plant communities, adapted to specific soil types, notably serpentine outcrops.
Specifically in the Russian Wilderness, Dr. John O. Sawyer and Dr. Dale Thornburgh discovered 17 species of conifers in one square mile of varied mountainous terrain, not to mention over 400 other species of vascular plants. They called this diverse area the Miracle Mile. Conifer species in the Klamath Mountains include Coast Douglas-fir (Pseudotsuga menziesii ssp. menziesii), Lawson's Cypress (also known as Port Orford Cedar; Chamaecyparis lawsoniana), Ponderosa Pine (Pinus ponderosa), Sugar Pine (Pinus lambertiana), Mountain Hemlock (Tsuga mertensiana), White Fir (Abies concolor var. lowiana), Red Fir (A. magnifica var. shastensis), Weeping Spruce (Picea breweriana), Coast Redwood (Sequoia sempervirens), Western Red Cedar (Thuja Plicata), and Pacific Yew (Taxus brevifolia).
- Trinity Alps flora
Typical species of the Trinity Alps region include Douglas fir, ponderosa pine, red fir, white fir, black oak, canyon live oak, Pacific madrone, bigleaf maple, California buckeye, incense cedar, and Jeffrey pine. California's northernmost stand of Gray Pine ("Pinus sabiniana") is found here along the South Fork of the Salmon River.
The vast forested wildlands, coupled with a low rate of human settlement in the rugged remote terrain, makes for excellent habitat for a number of species. Mammal species include mountain lions, black bears, bobcats, lynx, raccoons, martens, fishers, beavers, grey fox, red fox, northern flying squirrel, and plentiful deer. Bird species include golden eagles, bald eagles, pileated woodpecker, band-tailed pigeon, several hawks including goshawks, several large owl species including the spotted owl, plus an extensive variety of additional species both plant and animal.
The area used to have grizzly bears and gray wolves. A project to reintroduce Roosevelt Elk began in 1985 in the western Marble Mountains, near Elk Creek. Over the next 10 years the number and placement of reintroduced animals was expanded, and now elk can be seen roaming throughout the Marble Mountain Wilderness, in the northern Siskiyou Mountains, and along the South Fork of the Salmon River.
Rivers and fish 
The many mountains, streams and rivers form a major spawning ground for several species of trout and salmon; yet recently, in the last 50 years, some of the fish stocks have fallen drastically, particularly salmon stocks. The ecoregion's rivers and streams are home to nine species of native salmonids. The depletions occur mainly because the creation of dams and clear cut logging on the steep rugged slopes of the area both contribute to large amounts of silt in the stream beds, which in turn interferes with the salmon spawning, as they lay their eggs in exposed gravel beds. Other notable fish species, besides king salmon and silver salmon, include steelhead, brown trout, rainbow trout, kokanee salmon, eastern brook trout, crappie, bluegill, catfish, large and smallmouth bass.
See also 
- "Klamath Mountains". Peakbagger.com. Retrieved March 26, 2013.
- Sugihara, et al., pp. 170–194
- "Klamath National Forest". U.S. Forest Service. Retrieved March 26, 2013.
- Sawyer (2004), pp. 128–135
- Sawyer (2006), p. 104
- Benke, et al., p. 543
- "Pacific Northwest Forest Areas". U.S. Forest Service. Retrieved March 28, 2013.
- "Map of the national forests and other public lands of California". U.S. Forest Service. Retrieved March 28, 2013.
- "Wilderness". Oregon Wild. Retrieved March 28, 2013.
- "Wilderness Areas in California". Wilderness.net. Retrieved March 28, 2013.
- Bishop, pp. 29–31
- Irwin, William P.; Wooden, Joseph L. "Plutons and Accretionary Episodes of the Klamath Mountains, California and Oregon". U.S. Geological Survey. Open-File Report 99-374.
- "Klamath Mountains". Oregon Department of Geology and Mineral Industries. Retrieved December 11, 2011.
- "Serpentine and serpentinite". U.S. Geological Survey. Retrieved December 11, 2011.
- Hirt, William. "Geologic overview of the eastern Klamath Mountains" (PDF). Weed, CA: College of the Siskiyous Department of Natural Sciences. p. 4. Retrieved December 11, 2011.
- Hogan, C. Michael (August 29, 2008). "California Black Oak: Quercus kelloggii". GlobalTwitcher. N. Stromberg. Retrieved March 28, 2013.
- Kauffmann, Michael E. (2012). Conifer Country. Kneeland, CA: Backcountry Press. ISBN 9780578094168. OCLC 798852130.
- "The Klamath-Siskiyou Mountains: A Center of Diversity, Endemism, and Rarity". U.S. Forest Service. Retrieved April 12, 2013.
- Briles, et al., p. 590
- Axelrod, p. 51
- Kauffmann, Michael (October 2012). "Kin to the Earth - Remembering John Sawyer". Northcoast Environmental Center. Retrieved March 31, 2013.
- Strothmann and Roy, p. 1
- "Port-Orford-cedar Gate Closures In Effect". U.S. Forest Service. October 22, 2012. Retrieved March 31, 2013.
- Sawyer (2006), pp. 69, 71, 78, 80, 101, 117, 184
- "The Klamath/North Coast Bioregion -- An Overview". California Natural Resources Agency. Retrieved March 31, 2013.
- White, pp. 54, 243, 261, 318, 322
- Lewon, p. 20
- Wuerthner, p. 121
- "Botanical Areas". U.S. Forest Service. Retrieved April 6, 2013.
- "Elk Habitat Management Strategy: Klamath National Forest" (PDF). County of Siskiyou. May 2007. Archived from the original on March 31, 2012.
- Urness, Zach (September 17, 2011). "Happy Camp, Calif., in Klamath River country, is an epicenter of outdoors recreation". The Oregonian (Portland, OR).
- Moyle, Peter B.; Israel, Joshua A.; Purdy, Sabra E. (2008). "Salmon, Steelhead, and Trout in California: Status of an Emblematic Fauna" (PDF). University of California, Davis. pp. 20, 26. Retrieved April 12, 2013.
- "Klamath-Siskiyou". World Wildlife Fund. Retrieved April 12, 2013.
- "Trinity River". Kiene's Fly Shop. Retrieved April 12, 2013.
- Sawyer (2006), pp. 162–164, 166
- "Klamath Mountains Ecoregion" (PDF). Oregon Department of Fish and Wildlife. January 2006. p. 195. Retrieved April 12, 2013.
Works cited 
- Axelrod, Daniel I. (January 1985). Miocene Floras from the Middlegate Basin, West-Central Nevada. University of California Publications in Geological Sciences 129. Berkeley, CA: University of California Press. ISBN 9780520096950. OCLC 10532850.
- Benke, Arthur C., ed., and Cushing, Colbert E., ed.; Stanford, Jack A.; Gregory, Stanley V.; Hauer, Richard F.; Snyder, Eric B. (2005). Rivers of North America. Burlington, MA: Elsevier Academic Press. ISBN 0-12-088253-1. OCLC 59003378.
- Bishop, Ellen Morris (2004). Hiking Oregon's Geology (2nd ed.). Seattle, WA: Mountaineers Books. ISBN 9780898868470. OCLC 53887464.
- Briles, Christy E.; Whitlock, Cathy; Skinner, Carl N.; Mohr, Jerry (2011). "Holocene forest development and maintenance on different substrates in the Klamath Mountains, northern California, USA" (PDF). Ecology (Ecological Society of America) 92 (3): 590–601. doi:10.1890/09-1772.1. PMID 21608468. Retrieved March 29, 2013.
- Lewon, Dennis (2001). Hiking California's Trinity Alps Wilderness. Helena, MT: Falcon. ISBN 9781560447139. OCLC 47039653.
- Sawyer, John O. (2004). "Conifers of the Klamath Mountains". Vegetation Ecology, Proceedings of the second conference on Klamath-Siskiyou ecology. Cave Junction, OR: Siskiyou Field Institute.
- Sawyer, John O. (2006). Northwest California: A Natural History. Berkeley, CA: University of California Press. ISBN 9780520928367. OCLC 76812956.
- Skinner, C.N.; Taylor, A.H.; Agee, J.K. (2006). "Klamath Mountains bioregion". In Sugihara, N.G.; van Wagtendonk, J.W.; Fites-Kaufman, J.; Shaffer, K.E; Thode, A.E. Fire in California’s Ecosystems. Berkeley, CA: University of California Press. ISBN 9780520932272. OCLC 86110764.
- Strothmann, R.O.; Roy, Douglass F. (December 1984). "Regeneration of Douglas-fir in the Klamath Mountains Region, California and Oregon" (PDF). U.S. Forest Service. Retrieved March 31, 2013.
- White, Mike (2010). Trinity Alps and Vicinity: Including Whiskeytown, Russian Wilderness, and Castle Crags Areas (5th ed.). Berkeley, CA: Wilderness Press. ISBN 9780899975016. OCLC 351330287.
- Wuerthner, George (1997). California's Wilderness Areas. Englewood, CO: Westcliffe Publishers. ISBN 9781565792333. OCLC 39698847.
|Wikimedia Commons has media related to:|