Home > California > Yosemite Village > Yosemite Hydroelectric Power Plant, Highways 120 & 140, Yosemite Village, Mariposa County, CA
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Item Title
Yosemite Hydroelectric Power Plant, Highways 120 & 140, Yosemite Village, Mariposa County, CA
LocationHighways 120 & 140,
Yosemite Village, CA
Find maps of Yosemite Village, CA
Created/Published
Documentation compiled after 1968.
Notes
Survey number HAER CA-20
Building/structure dates:
1918 initial construction
Building/structure dates:
1939 subsequent work
Building/structure dates:
1951 subsequent work
Significance: The Yosemite Hydroelectric Power Plant is a good example of its type and possesses a high level of integrity. Though once commonplace the type of system utilized by the power plant is becoming rare with intact systems even more rare. There are no other known penstock-fed systems in California with their original Pelton wheels (a particular type of turbine), generators, switch boards, and design intact.
Subjects
T-plan BuildingsWooden BuildingsNational Parks & Reserves
Related Names
Galloway, J. D.
Markwart, A. H.
Collection
Historic American Engineering Record (Library of Congress)
Contents
Photograph caption(s):
1. POWER HOUSE, VIEW TO EAST
2. POWER HOUSE, VIEW TO SOUTHEAST WITH PACIFIC GAS AND ELECTRIC SUBSTATION IN FOREGROUND
3. POWERHOUSE, PLAQUE ON SOUTH WALL AT ENTRY
4. POWERHOUSE, PLAQUE ON SOUTH WALL AT ENTRY
5. POWERHOUSE, PELTON-FRANCIS TURBINES (GENERATORS) [UNITS NOS. 1 AND 2] WITH REGULATOR PANEL AT LEFT AND GATE VALVE IN CENTER FOREGROUND
6. POWERHOUSE, PELTON-FRANCIS TURBINE (GENERATOR), [UNIT NO. 2]
7. POWERHOUSE, PELTON-FRANCIS TURBINE (GENERATOR), [UNIT, NO. 1]
8. POWERHOUSE, PELTON-FRANCIS TURBINE (GENERATOR)
9. POWERHOUSE, REGULATOR PANEL
10. POWERHOUSE, TRANSFORMER
11. SCREENHOUSE, VIEW TO SOUTH/SOUTHWEST
12. SCREENHOUSE, VIEW TO SOUTH/SOUTHWEST
13. SCREENHOUSE, VIEW TO SOUTH/SOUTHWEST
14. SCREENHOUSE, DRIVE WHEEL ON SCREEN
15. SCREENHOUSE, MAIN GATE (INTAKE) AS MANUALLY OPERATED ORIGINALLY [NOW CONTROLLED HYDRAULICALLY]
16. SCREENHOUSE, ROTATING SCREEN FOR FILTERING WATER
17. DIVERSION DAM, VIEW TO SOUTH/SOUTHWEST WITH SCREENHOUSE, PLATFORM, AND INTAKE AT RIGHT
18. DIVERSION DAM, VIEW TO EAST WITH SCREENHOUSE BEHIND TREES AT LEFT
19. DIVERSION DAM, VIEW TO SOUTH
20. PENSTOCK, VIEW TO NORTH NEAR SCREENHOUSE WITH HIGHWAY 140 IN FOREGROUND
21. PENSTOCK, VIEW TO SOUTHWEST WITH NO. 1 BUTTERFLY VALVE FOR AUTOMATIC SHUTOFF JUST BELOW SCREENHOUSE IN FOREGROUND
22. PENSTOCK, VIEW TO NORTHEAST FROM HIGHWAY 140 JUST EAST OF NO. 1 BUTTERFLY VALVE
23. PENSTOCK, VIEW TO SOUTHEAST
24. PENSTOCK, VIEW TO EAST NEAR HIGHWAY 140
25. PENSTOCK, VIEW TO SOUTH
26. PENSTOCK, VIEW TO NORTHWEST WITH STEEL CAT WALK AND PENSTOCK PORTION
27. PENSTOCK, VIEW TO NORTH/NORTHWEST WITH TRESTLE IN FOREGROUND
28. Photocopy of microfiched construction drawing by Pelton Water Wheel Company, San Francisco, California, dated May 6, 1947. (Microfiched drawing located at the Denver Service Center, #104/601 54 - 2 of 18) LONGITUDINAL SECTION OF RECONSTRUCTED TURBINE UNIT NO. 2
29. Photocopy of microfiched construction drawing by Pelton Water Wheel Company, San Francisco, California, dated Feb. 8, 1934. (Microfiched drawing located at the Denver Service Center, #104/60154 - 3 of 18) 24' HAND OPERATED GATE VALVE
30. Photocopy of microfiched construction drawing by Pelton Water Wheel Company, San Francisco, California, dated 6-24-31. (Microfiched drawing located at the Denver Service Center, #104/60154 - 4 of 18) 0-3 & 0-5 GOVERNORS, CHART OF PIECE NUMBERS
31. Photocopy of microfiched construction drawing by Pelton Water Wheel Company, San Francisco, California, originally dated 5-2-47 with alterations dated 6-7-54 and 11-9-54. (Microfiched drawing located at the Denver Service Center, #104/60151 - 5 of 18) LONGITUDINAL SECTION OF RECONSTRUCTED TURBINE - UNIT NO. 2.
32. Photocopy of microfiched construction drawing by Pelton Water Wheel Company, San Francisco, California, dated 4-19-47. (Microfiched drawing located at the Denver Service Center, #104/60154 - 6 of 18) LONGITUDINAL SECTION OF 31' SINGLE DISCHARGE PELTON-FRANCIS TURBINE.
33. Photocopy of microfiched construction drawing by Galloway & Markwart Engineers, San Francisco, California, dated originally Jan. 23, 1917, with revisions dated April 20, 1917, and June 8, 1917. (Microfiched drawing located at the Denver Service Center, #104/60154 - 7 of 18) PENSTOCK PIPE, MAP - PROFILE - PIPE DETAILS
34. Photocopy of microfiched construction drawing by Galloway & Markwart Engineers, San Francisco, California, dated originally Jan. 23, 1917, with a revision dated April 20, 1917. (Microfiched drawing at the Denver Service Center, #104/60154 - 8 of 18) PENSTOCK PIPE, AIR VALVES - MAN HOLE - REDUCER & PIPE BENDS - EXPANSION JOINT & ANCHORS, 'Y' CONNECTION & BLIND FLANGE.
35. Photocopy of microfiched construction drawing by Galloway & Markwart Engineers, San Francisco, California, dated March 21, 1917. (Microfiched drawing at the Denver Service center, #104/60154 - 11 of 18) DETAILS OF SCREEN FOR INTAKE CHAMBER
36. Photocopy of microfiched construction drawing by Galloway & Markwart Engineers, San Francisco, California, dated April 3, 1917. (Microfiched drawing at the Denver Service Center, #104/60154 - 12 of 18) POWER STATION BUILDING, PLAN - ELEVATIONS & DETAILS
37. Photocopy of microfiched construction drawing by Galloway & Markwart Engineers, San Francisco, California, dated originally April 11, 1917 with a revision dated May 4, 1917. (Microfiched drawing at the Denver Service Center, #104/60154 - 13 of 18) YOSEMITE POWER PLANT - FOUNDATION PLAN AND DETAILS
38. Photocopy of microfiched construction drawing by Galloway & Markwart Engineers, San Francisco, California, dated originally July 3, 1917, with a revision dated Sept. 5, 1917. (Microfiched drawing of the Denver Service Center, #104/60154 - 15 of 18) FLOWLINE PIPE - DETAILS OF WOOD STOVE PIPE, AIR VALVES, MAN HOLES, STAND PIPE & PIPE BENDS
39. Photocopy of microfiched construction drawing by Galloway & Markwart Engineers, San Francisco, California, dated July 6, 1917 (Microfiched drawing at the Denver Service Center, #104/60154 - 16 of 18) FLOW LINE PIPE TRESTLE DETAILS
40. Photocopy of microfiched construction drawing by Galloway & Markwart Engineers, San Francisco, California, dated July 6, 1917. (Microfiched drawing located at the Denver Service Center, #104/60154 - 17 of 18) FLOW LINE PIPE TRESTLE DETAILS
41. Photocopy of microfiched construction drawing by Galloway & Markwart Engineers, San Francisco, California, dated Feb. 9, 1918. (Microfiched drawing located at the Denver Service Center, #104/60154 - 18 of 18) PLAN OF ELECTRICAL EQUIPMENT
42. Photocopy of original print construction drawing by General Electric Company, Schenectady, N.Y., dated Jan. 10, 1917 (original print located at Yosemite National Park 104/60264) OUTLINE - GENERATOR, EXCITER & MACHINE
43. Photocopy of microfiched construction drawing by Office of Park Engineer, Yosemite National Park, California, dated Sept. 25, 1934 (Microfiched drawing located at the Denver Service Center, #104/8058) STANDPIPE DETAILS FOR POWER HOUSE PENSTOCK LINE
44. Photocopy of microfiched construction drawing by Galloway & Markwart Engineers, San Francisco, California, dated Feb. 1918 (Microfiched drawing located at the Denver Service Center, #104/2222) PLAN AND DETAILS OF DAM AND INTAKE
45. Photocopy of original construction drawing by Yosemite National Park, California, dated August, 1931. (Original located at Federal Records Center, Denver, Colorado - 104/5069) PLAN FOR CONTROLLING LEAKAGE AT POWER HOUSE DIVERSION DAM
46. Photocopy of microfiched construction drawing by Yosemite National Park, California, date unknown. (Microfiched drawing located at the Denver Service Center, #104/5048). ELECTRIC DISTRIBUTION SYSTEM (SHEET 1 OF 2, Eastern Section).
47. Photocopy of microfiched construction drawing by Yosemite National Park, California, date unknown. (Microfiched drawing located at the Denver Service Center, #104/5048). ELECTRIC DISTRIBUTION SYSTEM (SHEET 2 OF 2, Weastern Section).
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