Diablo Dam
| Diablo Dam | |
|---|---|
 | |
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| Location | Washington, U.S. |
| Opening date | 1930 |
| Dam and spillways | |
| Type of dam | Concrete arch-gravity[1] |
| Impounds | Skagit River |
| Height | 389 ft (119 m)[1] |
| Length | 1,180 ft (360 m)[1] |
| Reservoir | |
| Total capacity | 88,500 acre⋅ft (109,200,000 m3)[1] |
| Catchment area | 1,103 mi2 (2,860 km2)[1] |
| Surface area | 990 acres (400 ha)[1] |
| Power Station | |
| Commission date | 1936 |
| Turbines | 2x 64.5 MW[2] |
| Installed capacity | 129 MW[2] |
| Capacity factor | 61% |
| Annual generation | 689,400,000 KWh[3] |
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Diablo Dam is one of three dams along the upper Skagit River in Whatcom County, Washington and part of the Skagit River Hydroelectric Project that supplies Seattle with some of its power needs. The dam was built in Diablo Canyon, a gorge of solid granite with vertical walls rising 160 feet (49 m) from the river bed, yet were less than 100 feet (30 m) apart. Construction began in 1927, and was completed in 1930. The dam began generating electricity in 1936.[4]
The result was a power-generating dam that holds a reservoir known as Diablo Lake. At the time it was completed, Diablo Dam, at 389 feet (119 m), was the tallest dam in the world.[5] Water from the dam operates two main generators, each with a capacity of 64.5 MW.[2]Lua error in Module:Coordinates at line 489: attempt to index field 'wikibase' (a nil value). The dam and its original associated power generation infrastructure were listed on the National Register of Historic Places in 1989.[6]
Climate
[edit | edit source]The Western Regional Climate Center (WRCC) reports weather station 452157 at Diablo Dam since 1948, presently at Lua error: callParserFunction: function "#coordinates" was not found. with an elevation of 891 feet (272 m).[7] The dam is in a transitional maritime-mediterranean climate (Köppen: Cfb/Csb) depending on summer rainfall isotherm.
| Climate data for Diablo Dam, Washington (1991–2020 normals, extremes 1914–present) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 62 (17) |
63 (17) |
76 (24) |
90 (32) |
103 (39) |
110 (43) |
106 (41) |
106 (41) |
101 (38) |
87 (31) |
65 (18) |
59 (15) |
110 (43) |
| Mean maximum °F (°C) | 48.4 (9.1) |
52.7 (11.5) |
63.7 (17.6) |
75.9 (24.4) |
86.4 (30.2) |
90.8 (32.7) |
95.6 (35.3) |
94.8 (34.9) |
88.4 (31.3) |
72.7 (22.6) |
55.1 (12.8) |
48.5 (9.2) |
98.3 (36.8) |
| Mean daily maximum °F (°C) | 38.5 (3.6) |
43.2 (6.2) |
49.0 (9.4) |
57.2 (14.0) |
66.1 (18.9) |
70.3 (21.3) |
78.1 (25.6) |
78.8 (26.0) |
71.3 (21.8) |
57.5 (14.2) |
44.7 (7.1) |
38.1 (3.4) |
57.7 (14.3) |
| Daily mean °F (°C) | 34.0 (1.1) |
36.7 (2.6) |
41.1 (5.1) |
47.4 (8.6) |
55.2 (12.9) |
59.8 (15.4) |
65.8 (18.8) |
66.4 (19.1) |
60.1 (15.6) |
49.5 (9.7) |
39.8 (4.3) |
34.2 (1.2) |
49.2 (9.6) |
| Mean daily minimum °F (°C) | 29.5 (−1.4) |
30.3 (−0.9) |
33.1 (0.6) |
37.5 (3.1) |
44.2 (6.8) |
49.4 (9.7) |
53.4 (11.9) |
53.9 (12.2) |
48.9 (9.4) |
41.5 (5.3) |
34.8 (1.6) |
30.2 (−1.0) |
40.6 (4.8) |
| Mean minimum °F (°C) | 17.4 (−8.1) |
21.2 (−6.0) |
25.5 (−3.6) |
30.7 (−0.7) |
35.8 (2.1) |
42.5 (5.8) |
47.3 (8.5) |
47.3 (8.5) |
41.4 (5.2) |
31.8 (−0.1) |
24.4 (−4.2) |
19.1 (−7.2) |
11.2 (−11.6) |
| Record low °F (°C) | −2 (−19) |
0 (−18) |
9 (−13) |
24 (−4) |
28 (−2) |
33 (1) |
38 (3) |
37 (3) |
31 (−1) |
18 (−8) |
5 (−15) |
−2 (−19) |
−2 (−19) |
| Average precipitation inches (mm) | 12.25 (311) |
7.38 (187) |
8.16 (207) |
4.60 (117) |
2.71 (69) |
2.25 (57) |
1.25 (32) |
1.51 (38) |
3.41 (87) |
8.64 (219) |
13.66 (347) |
11.57 (294) |
77.39 (1,965) |
| Average snowfall inches (cm) | 12.2 (31) |
9.9 (25) |
4.2 (11) |
0.3 (0.76) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
3.1 (7.9) |
16.0 (41) |
45.7 (116.66) |
| Average extreme snow depth inches (cm) | 11.0 (28) |
7.7 (20) |
4.1 (10) |
0.1 (0.25) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
1.9 (4.8) |
9.7 (25) |
16.0 (41) |
| Average precipitation days (≥ 0.01 in) | 18.8 | 15.6 | 19.0 | 16.5 | 12.8 | 12.1 | 6.4 | 6.3 | 10.8 | 16.6 | 19.9 | 19.5 | 174.3 |
| Average snowy days (≥ 0.1 in) | 4.4 | 2.6 | 2.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.3 | 5.1 | 15.5 |
| Source 1: NOAA[8] | |||||||||||||
| Source 2: National Weather Service[9] | |||||||||||||
Panorama
[edit | edit source]
See also
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References
[edit | edit source]
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- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Includes construction photos.
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External links
[edit | edit source]- Diablo Dam, 1929-1932 (Part 1) (Part 2) (Part 3) – silent film clips of construction posted by Seattle Municipal Archives on YouTube
External links
[edit | edit source]- Historic American Engineering Record (HAER) documentation, filed under Newhalem, Whatcom County, WA:
- HAER No. WA-24-D, "Skagit Power Development, Diablo Powerhouse", 43 photos, 2 color transparencies, 6 measured drawings, 5 photo caption pages
- HAER No. WA-24-E, "Skagit Power Development, Incline Railway", 4 photos, 1 photo caption page
- HAER No. WA-24-F, "Skagit Power Development, Diablo Dam", 12 photos, 1 measured drawing, 2 photo caption pages
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 | This Whatcom County, Washington state location article is a stub. You can help Wikipedia by expanding it. |
- Dams in Washington (state)
- Seattle City Light dams
- Buildings and structures in Whatcom County, Washington
- Historic American Engineering Record in Washington (state)
- Hydroelectric power plants in Washington (state)
- United States power company dams
- Dams completed in 1930
- Energy infrastructure completed in 1936
- Arch dams
- Dams on the Skagit River
- National Register of Historic Places in Ross Lake National Recreation Area
- 1930 establishments in Washington (state)
- Whatcom County, Washington, geography stubs