| Mokelumne Wilderness | |
|---|---|
Round Top Peak in the Mokelumne Wilderness | |
Map of theUnited States | |
| Location | Sierra Nevada Mountain Range,Alpine /Amador /Calaveras counties,California,United States |
| Nearest city | South Lake Tahoe, California (north),Markleeville, California (east) |
| Coordinates | 38°35′00″N119°58′43″W / 38.58333°N 119.97861°W /38.58333; -119.97861 |
| Area | 105,165 acres (425.59 km2) |
| Established | 1964 |
| Governing body | U.S. Forest Service |
TheMokelumne Wilderness is a 105,165-acre (164 sq mi; 426 km2)[1] federally designatedwilderness area located 70 miles (110 km) east ofSacramento, California. It is within the boundaries of three national forests:Stanislaus,Eldorado andToiyabe. First protected under theWilderness Act of 1964, the Mokelumne's borders were expanded under theCalifornia Wilderness Act of 1984 with the addition of 55,000[2] acres. The wilderness takes its name from theMokelumne River, which was named after aMi-wok Indian village located on the riverbank in California's Central Valley.[3]
The wilderness encompasses an area of theSierra Nevada mountain range betweenEbbetts Pass andCarson Pass. There are two sections separated by the Blue Lakes Road and anOff-Road Vehicle corridor.
Elevations range from 4,000 feet (1,200 m) to 10,381 feet (3,164 m). The highest point is Round Top (10,364 feet[4]), a remnantvolcano from which the wilderness area's volcanic soils are derived.
The west slopes have been eroded byglaciation and water down to the granitebedrock which has created a dramatic contrast between the volcanic and the granitic landscapes.
The wilderness protects habitat for a great variety of plants and animals especially on the slopes of Round Top, which is designated a special interest area. Plants include Ponderosa pine, canyon live oak as well as alpine vegetation ofWhitebark pine, subalpine fir, and western juniper, withwestern white pine,mountain hemlock, and lodgepole pine found in sheltered areas.Waterways such as the North Fork of the Mokelumne River have riparian zones of white and mountain alder, creek dogwood, western azalea and bitter cherry.Wildlife include the black bear andmule deer, as well as martin, bald eagle and the Californiaspotted owl.[5]
The Round Top Botanical Area is at the junction of three botanical provinces and includes red fir forest, sagebrush scrub, subalpine and alpine environments. The combination of soil types, varying exposure and elevations produce diverse plant life, such as the phantom orchid (Cephalanthera austiniae), a rare parasitic plant. The plant's common name is due to its color being all or mostly white.
The Round Top Geologic Area has more than 3,000 acres (12 km2) within the wilderness and encompasses a variety of geological areas, including exposedgranodiorite, lava flows, dikes, glacialmoraines andcirques. The landform known as Elephants Back is a rounded mass of solidified lava. Mineralization produced gold-bearing quartz veins, and relics of past gold mining activities are still present in the area.
The Wilderness experiences a warm summer Mediterranean to subarctic climates. Snow can be found at all elevations with more the higher you go especially around the crests.
| Climate data for Blue Lakes, California, 1991–2020 normals, 1983–2020 extremes: 8057ft (2456m) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 59 (15) | 64 (18) | 76 (24) | 79 (26) | 90 (32) | 93 (34) | 94 (34) | 92 (33) | 83 (28) | 77 (25) | 66 (19) | 58 (14) | 94 (34) |
| Mean maximum °F (°C) | 50.2 (10.1) | 50.9 (10.5) | 56.6 (13.7) | 61.5 (16.4) | 67.4 (19.7) | 75.0 (23.9) | 79.6 (26.4) | 78.6 (25.9) | 74.6 (23.7) | 67.2 (19.6) | 57.9 (14.4) | 50.4 (10.2) | 80.7 (27.1) |
| Mean daily maximum °F (°C) | 36.5 (2.5) | 37.1 (2.8) | 41.9 (5.5) | 46.0 (7.8) | 53.3 (11.8) | 62.9 (17.2) | 71.2 (21.8) | 70.3 (21.3) | 64.3 (17.9) | 53.5 (11.9) | 42.5 (5.8) | 35.6 (2.0) | 51.3 (10.7) |
| Daily mean °F (°C) | 26.6 (−3.0) | 26.6 (−3.0) | 30.5 (−0.8) | 34.4 (1.3) | 41.6 (5.3) | 50.3 (10.2) | 58.6 (14.8) | 58.0 (14.4) | 52.5 (11.4) | 43.0 (6.1) | 33.4 (0.8) | 26.2 (−3.2) | 40.1 (4.5) |
| Mean daily minimum °F (°C) | 16.7 (−8.5) | 16.0 (−8.9) | 19.1 (−7.2) | 22.7 (−5.2) | 29.8 (−1.2) | 37.6 (3.1) | 45.8 (7.7) | 45.7 (7.6) | 40.7 (4.8) | 32.5 (0.3) | 24.3 (−4.3) | 16.8 (−8.4) | 29.0 (−1.7) |
| Mean minimum °F (°C) | −1.9 (−18.8) | −1.0 (−18.3) | 1.0 (−17.2) | 7.2 (−13.8) | 18.1 (−7.7) | 27.2 (−2.7) | 38.0 (3.3) | 38.2 (3.4) | 30.5 (−0.8) | 20.8 (−6.2) | 10.2 (−12.1) | 0.0 (−17.8) | −7.4 (−21.9) |
| Record low °F (°C) | −16 (−27) | −18 (−28) | −9 (−23) | −7 (−22) | 6 (−14) | 16 (−9) | 28 (−2) | 30 (−1) | 5 (−15) | 2 (−17) | −7 (−22) | −21 (−29) | −21 (−29) |
| Averageprecipitation inches (mm) | 7.63 (194) | 6.89 (175) | 6.32 (161) | 4.08 (104) | 2.23 (57) | 0.84 (21) | 0.45 (11) | 0.35 (8.9) | 0.72 (18) | 2.23 (57) | 4.08 (104) | 7.13 (181) | 42.95 (1,091.9) |
| Average extreme snow depth inches (cm) | 55.9 (142) | 70.8 (180) | 79.7 (202) | 69.8 (177) | 49.0 (124) | 17.8 (45) | 0.8 (2.0) | 0.0 (0.0) | 0.3 (0.76) | 3.9 (9.9) | 15.0 (38) | 38.0 (97) | 85.1 (216) |
| Average precipitation days(≥ 0.01 in) | 12.2 | 12.8 | 14.6 | 12.2 | 8.4 | 3.7 | 2.3 | 1.7 | 3.0 | 5.8 | 9.8 | 13.1 | 99.6 |
| Source 1: XMACIS2 (1999-2020 snow depth)[6] | |||||||||||||
| Source 2: NOAA (Precipitation)[7] | |||||||||||||
There are several mountains in the wilderness including these named peaks:[8][9][10]
This is not a complete list and only includes non-numbered named peaks above 8,600 ft elevation in the wilderness.

The Mokelumne Wilderness has a variety of recreational opportunities all year. With landscapes ranging from deep canyons to alpine heights and more than two hundred ice-scoured lakes andtarns, fishing and hiking are popular activities as well as cross country skiing. Access is from roads surrounding the wilderness boundary with Carson Pass being the most used entry point.ThePacific Crest Trail, theTahoe–Yosemite Trail and the Emigrant Summit Trail all cross through the Mokelumne Wilderness. The Emigrant Summit Trail is a designated National Recreation and Historic Trail that follows the western boundary and then passes through the wilderness fromEmigrant Valley toCaples Lake.
Wilderness permits are required year-round for overnight visits.[11]
Adkinson, RonWild Northern California. The Globe Pequot Press, 2001