Salt Springs Reservoir
The 141,900 acre-foot (175,000,000 m) reservoir is formed by Salt Springs Dam on the North Fork of the Mokelumne River. The concrete-faced rock-fill dam is 332 feet (101 m) tall and was completed in 1931. It is owned by Pacific Gas and Electric and its sole purpose is hydroelectricity production, though limited recreation is available. A short pipeline from the reservoir conveys water to the 44 MW Salt Springs Powerhouse. Some of the water is returned to the river downstream, but much of it flows into the Tiger Creek Conduit, a concrete flume that moves water downstream for use in other powerhouses in PG&E's Mokelumne River Project (FERC Project 137).
The dam has a history of settlement problems caused by poor consolidation of the rocks during construction. The concrete face has been cracked many times by the movement, causing leaks. The surface of the dam consists of cracks, craters and shotcrete overlays. It was decided to use a flexible geomembrane to cover the portions of the dam with the greatest leakage. The installation of the membrane was completed in 2005.
The dam is being examined as the lower pool in a 380-1,140 MW pumped-storage project with the Bear River Dam as the upper pool.
Climate
| Climate data for Salt Springs Reservoir, California | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 74 (23) |
78 (26) |
82 (28) |
90 (32) |
95 (35) |
100 (38) |
103 (39) |
105 (41) |
103 (39) |
97 (36) |
84 (29) |
80 (27) |
105 (41) |
| Mean maximum °F (°C) | 66 (19) |
71 (22) |
72 (22) |
78 (26) |
84 (29) |
91 (33) |
96 (36) |
96 (36) |
93 (34) |
86 (30) |
75 (24) |
65 (18) |
98 (37) |
| Mean daily maximum °F (°C) | 51.9 (11.1) |
53.2 (11.8) |
57.2 (14.0) |
62.3 (16.8) |
70.0 (21.1) |
80.0 (26.7) |
88.2 (31.2) |
88.7 (31.5) |
83.4 (28.6) |
72.9 (22.7) |
59.0 (15.0) |
50.5 (10.3) |
68.1 (20.1) |
| Daily mean °F (°C) | 42.8 (6.0) |
43.1 (6.2) |
46.6 (8.1) |
50.3 (10.2) |
57.2 (14.0) |
65.0 (18.3) |
72.9 (22.7) |
72.8 (22.7) |
68.9 (20.5) |
55.3 (12.9) |
45.3 (7.4) |
42.3 (5.7) |
55.2 (12.9) |
| Mean daily minimum °F (°C) | 33.7 (0.9) |
34.9 (1.6) |
35.9 (2.2) |
38.3 (3.5) |
44.3 (6.8) |
51.8 (11.0) |
57.7 (14.3) |
56.9 (13.8) |
52.4 (11.3) |
46.4 (8.0) |
38.7 (3.7) |
34.0 (1.1) |
43.8 (6.5) |
| Mean minimum °F (°C) | 21.9 (−5.6) |
23.7 (−4.6) |
25.3 (−3.7) |
28.7 (−1.8) |
35.1 (1.7) |
41.5 (5.3) |
49.8 (9.9) |
49.0 (9.4) |
42.4 (5.8) |
35.4 (1.9) |
27.6 (−2.4) |
22.6 (−5.2) |
19.0 (−7.2) |
| Record low °F (°C) | 8 (−13) |
10 (−12) |
13 (−11) |
12 (−11) |
25 (−4) |
32 (0) |
38 (3) |
37 (3) |
33 (1) |
22 (−6) |
6 (−14) |
−2 (−19) |
−2 (−19) |
| Average precipitation inches (mm) | 8.19 (208) |
6.74 (171) |
6.85 (174) |
3.74 (95) |
2.08 (53) |
0.84 (21) |
0.21 (5.3) |
0.28 (7.1) |
0.95 (24) |
2.60 (66) |
5.71 (145) |
6.89 (175) |
45.08 (1,144.4) |
| Average snowfall inches (cm) | 14.3 (36) |
12.0 (30) |
15.5 (39) |
7.1 (18) |
0.5 (1.3) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.1 (0.25) |
2.5 (6.4) |
10.2 (26) |
62.2 (156.95) |
| Average precipitation days (≥ 0.01 in) | 11 | 10 | 12 | 9 | 7 | 4 | 1 | 1 | 3 | 5 | 9 | 10 | 82 |
| Source: NOAA | |||||||||||||
See also
References
- ^ "FERC Seeks Input on App for 1,140-MW GreenGenStorage Pumped Storage Hydro Project". Retrieved 14 October 2016.
- ^ "U.S. Climate Normals Quick Access – Station: Sonora, CA". National Oceanic and Atmospheric Administration. Retrieved May 23, 2023.