| Sweetwater Mountains | |
|---|---|
Sweetwater Mountains, looking West toward Sonora Pass.
| |
| Highest point | |
| Peak | Mount Patterson |
| Elevation | 11,673 ft (3,558 m) |
| Coordinates | 38°26′10.5″N 119°18′20.0″W / 38.436250°N 119.305556°W / 38.436250; -119.305556 |
| Geography | |
  Sweetwater Mountains location of Sweetwater Mountains along the border of California and Nevada[1] | |
| Country | United States |
| States | California and Nevada |
| Counties | Mono County and Lyon County |
| Range coordinates | 38°25′59.696″N 119°18′3.568″W / 38.43324889°N 119.30099111°W / 38.43324889; -119.30099111 |
| Topo map | USGS Mount Patterson |
| Geology | |
| Type of rock | igneous and volcanic |
The Sweetwater Mountains (highest peak: Mount Patterson 11,654 feet (3,552 m)[2]) are a small mountain range in northern Mono County, California and western Lyon County, Nevada, separating the West Walker River from the East Walker River. Most of the range is only accessible by four wheel drive vehicle, on foot, or pack animal. Most of the range is contained in the Toiyabe National Forest. The place name appears on the 1874 California Geologic Survey map of California and Nevada.
The ghost towns of Belfort and Clinton are small gold mining camps on the southeastern slope of Mt. Patterson. The Sweetwater post office existed on the eastern boundary of the range in the 1920s. The Fales post office existed on the southwestern boundary in 1877. Both Clinton and Belfort had post offices in the 1880s. There are several other inactive small gold mining camps and gold mines in the range, including Boulder Flat, Montague Mine, Angelo Mission Mine, Kentuck Mine, Frederick Mine, Longstreet Mine, Lilly Mine, Deep Creek Mine, and Tiger Mine. The area roughly forming a SE quadrant from the summit of Mt Patterson, bounded by Sweetwater Canyon (easterly line) and Frying Pan Canyon (southerly line), is known as the Patterson Mining District of Mono County according to the 1888 report of the State of California Mineralogist. The 1888 report also records the Cameron mining camp, which is now unknown. At least one mining company issued stock: Monte Cristo Consolidated Mining Company, 100,000 shares issued in 1887 at $10 each.
The Sweetwater Mountains geology largely consists of a pluton surrounded by volcanic flow from the Little Walker Caldera. Mt. Patterson is a volcano of uncertain age which is capped with white rhyolite.
Besides Mount Patterson, other peaks in the Sweetwater Range include Middle Sister and East Sister.
The Sweetwater Mountains mostly see a subartic to alpine climate due to its high elevation with some of the lower outskirts seeing a warm Mediterranean climate type. Winters are very cold with abundant snowfall and precipitation but still not as much as the nearby Sierra crests and peaks at the samwhich are able to pick up more moisture with no rain shadow effect. However, Mt Patterson, the highest point in the mountain
| Climate data for Mount Patterson 38.4189 N, 119.2930 W, Elevation: 11,411 ft (3,478 m) (1991–2020 normals) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Mean daily maximum °F (°C) | 30.5 (−0.8) |
29.2 (−1.6) |
31.6 (−0.2) |
36.0 (2.2) |
44.1 (6.7) |
54.3 (12.4) |
62.9 (17.2) |
62.3 (16.8) |
56.2 (13.4) |
46.7 (8.2) |
36.4 (2.4) |
30.4 (−0.9) |
43.4 (6.3) |
| Daily mean °F (°C) | 19.4 (−7.0) |
17.9 (−7.8) |
21.4 (−5.9) |
24.6 (−4.1) |
31.0 (−0.6) |
41.3 (5.2) |
49.1 (9.5) |
48.4 (9.1) |
42.2 (5.7) |
33.6 (0.9) |
25.2 (−3.8) |
19.4 (−7.0) |
31.1 (−0.5) |
| Mean daily minimum °F (°C) | 8.2 (−13.2) |
6.6 (−14.1) |
9.3 (−12.6) |
13.2 (−10.4) |
20.0 (−6.7) |
28.2 (−2.1) |
35.3 (1.8) |
34.5 (1.4) |
28.3 (−2.1) |
20.5 (−6.4) |
14.0 (−10.0) |
8.4 (−13.1) |
18.9 (−7.3) |
| Average precipitation inches (mm) | 8.88 (226) |
7.43 (189) |
6.50 (165) |
3.53 (90) |
2.12 (54) |
0.66 (17) |
0.71 (18) |
0.72 (18) |
0.59 (15) |
2.25 (57) |
3.27 (83) |
7.27 (185) |
43.93 (1,117) |
| Source: PRISM Climate Group[3] | |||||||||||||
| Climate data for Lobdell Lake, California (9249 ft) , 1991–2024 normals and extremes | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 57 (14) |
61 (16) |
64 (18) |
65 (18) |
76 (24) |
83 (28) |
86 (30) |
83 (28) |
81 (27) |
75 (24) |
67 (19) |
57 (14) |
86 (30) |
| Mean maximum °F (°C) | 52 (11) |
52 (11) |
55 (13) |
60 (16) |
66 (19) |
75 (24) |
79 (26) |
78 (26) |
74 (23) |
67 (19) |
59 (15) |
52 (11) |
80 (27) |
| Mean daily maximum °F (°C) | 37.5 (3.1) |
37.4 (3.0) |
41.3 (5.2) |
45.2 (7.3) |
52.9 (11.6) |
63.2 (17.3) |
71.5 (21.9) |
70.7 (21.5) |
63.8 (17.7) |
53.8 (12.1) |
43.9 (6.6) |
36.9 (2.7) |
51.5 (10.8) |
| Daily mean °F (°C) | 26.9 (−2.8) |
26.1 (−3.3) |
29.4 (−1.4) |
33.4 (0.8) |
41.0 (5.0) |
49.9 (9.9) |
57.8 (14.3) |
56.8 (13.8) |
50.7 (10.4) |
41.6 (5.3) |
33.0 (0.6) |
26.5 (−3.1) |
39.4 (4.1) |
| Mean daily minimum °F (°C) | 16.2 (−8.8) |
14.7 (−9.6) |
17.5 (−8.1) |
21.7 (−5.7) |
29.0 (−1.7) |
36.6 (2.6) |
44.2 (6.8) |
43.0 (6.1) |
37.4 (3.0) |
29.3 (−1.5) |
22.0 (−5.6) |
16.2 (−8.8) |
27.3 (−2.6) |
| Mean minimum °F (°C) | −4 (−20) |
−3 (−19) |
1 (−17) |
5 (−15) |
15 (−9) |
22 (−6) |
35 (2) |
34 (1) |
24 (−4) |
12 (−11) |
3 (−16) |
−2 (−19) |
−8 (−22) |
| Record low °F (°C) | −21 (−29) |
−13 (−25) |
−10 (−23) |
−6 (−21) |
3 (−16) |
9 (−13) |
22 (−6) |
21 (−6) |
16 (−9) |
−4 (−20) |
−10 (−23) |
−21 (−29) |
−21 (−29) |
| Average precipitation inches (mm) | 4.15 (105) |
3.90 (99) |
3.75 (95) |
1.81 (46) |
1.61 (41) |
0.65 (17) |
0.66 (17) |
0.72 (18) |
0.80 (20) |
1.38 (35) |
2.43 (62) |
3.74 (95) |
25.6 (650) |
| Average extreme snow depth inches (cm) | 50 (130) |
55 (140) |
59 (150) |
44 (110) |
22 (56) |
1 (2.5) |
0 (0) |
0 (0) |
0 (0) |
4 (10) |
12 (30) |
30 (76) |
59 (150) |
| Source: NOAA[4] | |||||||||||||
To find the table data on the PRISM website, start by clicking Coordinates (under Location); copy Latitude and Longitude figures from top of table; click Zoom to location; click Precipitation, Minimum temp, Mean temp, Maximum temp; click 30-year normals, 1991-2020; click 800m; click Retrieve Time Series button.
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