Near Groveland in Tuolumne County, California — The American West (Pacific Coastal)

O’Shaughnessy Dam

Photographed By Karen Key, June 22, 2007

1. O'Shaughnessy Dam Marker

Inscription.

O’Shaughnessy Dam. . (Tablet 1) , O’Shaughnessy Dam , 1915–1922 , City and County of San Francisco. , James Rolph Jr. Mayor , , . Foundation Elev. 3388 . Bottom Valves Elev. 3508 . Initial Crest Elev. 3726 . Length of Crest 600 . Storage Cap’y Gals. 66,000,000,000 . Drainage Area Acres 294,000 . Reservoir Area Acres 1590 . Concrete Volume Cu. Yds. 390,000 , M.M. O’Shaugnessy, Engineer , Utah Construction Co. Contr’s. , , (Tablet 2) , Structure Completed 1938 . Height Increased 68 Feet . Federal Emergency Administration of Public Works . Project No. 1429 , , Angelo J. Rossi, Mayor , Public Utilities Commission , . Lewis F. Byington, President . George Filmer, Vice President . John H. McCallum, Commissioner . John P. Murphy, Commissioner . John P. McLaughlin, Commissioner . EDW. G. Cahill, Mgr. of Utilities . M.M. O’Shaughnessy, Engineer, Design . L.T. McAfee, Engineer, Construction . Transbay Construction Co., Contractor , , . Height Above Stream Bed, Ft. 312 . Height Above Foundation, Ft. 426 . Crest Elev. Ft. 3,812 . Crest Length, Ft. 900 . Storage Cap'y, Gals. 117,300,000,000 . Watershed Area. Sq. Mi. 459 . Reservoir Area, Acres 1,972 . Concrete Volume. Cu. Yds. 675,000 , , (Tablet 3) , Canyon Power Tunnel , 1962–1964 , George Christopher, Mayor , Public Utilities Commission , . Stuart n. Greenberg, President . Thos. P. White, Vice Pres. . Thos. F. Stack . George F. Hansen . Bert Simon , , Robert C. Kirkwood, Manager of Utilities , Oral L. Moore, General Manager Hetch Hetchy Water Supply , , Length: O’Shaughnessy Dam to early intake – 10.1 miles , Dimensions: 14'-0" by 14'-6" Horseshoe , Capacity: 850 Cubic Feet Per Second , , (Tablet 4) , 75th Anniversary of the Completion of the O’Shaughnessy Dam , July 11, 1998 , Hetch Hetchy Water and Power , , and in recognition of the contributions of , Hetch Hetchy Water and Power Personnel , Tuolumne County, The U.S. Forest Service , The National Park Service , , City and County of San Francisco , Willie L. Brown, Jr., Mayor , , San Francisco Public Utilities Commission , . Victor G. Makras, President . Ann Moller Caen, Vice President, E. Denis Normandy, Commissioner . Robert K. Werbe, Commissioner . Frank L. Cook, commissioner , , Anson B. Moran, General Manager SFPUC , Lawrence T. Klein, General Manager, HW&P , . This historical marker is Near Groveland in Tuolumne County California

(Tablet 1)
O’Shaughnessy Dam
1915–1922
City and County of San Francisco.
James Rolph Jr. Mayor

• Foundation Elev. 3388 • Bottom Valves Elev. 3508 • Initial Crest Elev. 3726 • Length of Crest 600 • Storage Cap’y Gals. 66,000,000,000 • Drainage Area Acres 294,000 • Reservoir Area Acres 1590 • Concrete Volume Cu. Yds. 390,000

M.M. O’Shaugnessy, Engineer
Utah Construction Co. Contr’s.

(Tablet 2)
Structure Completed 1938 • Height Increased 68 Feet • Federal Emergency Administration of Public Works • Project No. 1429

Angelo J. Rossi, Mayor
Public Utilities Commission
• Lewis F. Byington, President • George Filmer, Vice President • John H. McCallum, Commissioner • John P. Murphy, Commissioner • John P. McLaughlin, Commissioner • EDW. G. Cahill, Mgr. of Utilities • M.M. O’Shaughnessy, Engineer, Design • L.T. McAfee, Engineer, Construction • Transbay Construction

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Co., Contractor

• Height Above Stream Bed, Ft. 312 • Height Above Foundation, Ft. 426 • Crest Elev. Ft. 3,812 • Crest Length, Ft. 900 • Storage Cap'y, Gals. 117,300,000,000 • Watershed Area. Sq. Mi. 459 • Reservoir Area, Acres 1,972 • Concrete Volume. Cu. Yds. 675,000

(Tablet 3)
Canyon Power Tunnel
1962–1964
George Christopher, Mayor
Public Utilities Commission
• Stuart n. Greenberg, President • Thos. P. White, Vice Pres. • Thos. F. Stack • George F. Hansen • Bert Simon

Robert C. Kirkwood, Manager of Utilities
Oral L. Moore, General Manager Hetch Hetchy Water Supply

Length: O’Shaughnessy Dam to early intake – 10.1 miles
Dimensions: 14'-0" by 14'-6" Horseshoe
Capacity: 850 Cubic Feet Per Second

(Tablet 4)
75th Anniversary of the Completion of the O’Shaughnessy Dam
July 11, 1998
Hetch Hetchy Water and Power

and in recognition of the contributions of
Hetch Hetchy Water & Power Personnel
Tuolumne County, The U.S. Forest Service
The National Park Service

City and County of San Francisco
Willie L. Brown,

Structure Completed 1938 image. Click for full size.

Photographed By Karen Key, June 22, 2007

2. Structure Completed 1938

Jr., Mayor

San Francisco Public Utilities Commission
• Victor G. Makras, President • Ann Moller Caen, Vice President, E. Denis Normandy, Commissioner • Robert K. Werbe, Commissioner • Frank L. Cook, commissioner

Anson B. Moran, General Manager SFPUC
Lawrence T. Klein, General Manager, HW&P

Topics. This historical marker is listed in these topic lists: Industry & Commerce • Waterways & Vessels. A significant historical month for this entry is July 1834.

Location. 37° 56.859′ N, 119° 47.273′ W. Marker is near Groveland, California, in Tuolumne County. Marker can be reached from Hetch Hetchy Road. Touch for map. Marker is in this post office area: Groveland CA 95321, United States of America. Touch for directions.

Other nearby markers. At least 8 other markers are within 18 miles of this marker, measured as the crow flies. Hetch Hetchy Reservoir and O’Shaughnessy Dam (here, next to this marker); Producing Clean Renewable Energy (here, next to this marker); Water Quality at Hetch Hetchy (here, next to this marker); Trails and Waterfalls (here, next to this marker); Hetch Hetchy Railroad (here, next to this marker); John Muir... The Woodcutter (approx. 17.3 miles away); The Ahwahneechee

Canyon Power Tunnel image. Click for full size.

Photographed By Karen Key, June 22, 2007

3. Canyon Power Tunnel

(approx. 17.4 miles away); James Hutchings (approx. 17½ miles away). Touch for a list and map of all markers in Groveland.

Also see . . .
1. Yosemite National Park. O'Shaughnessy Dam and Hetch Hetchy Reservoir is part of the park. (Submitted on July 29, 2007, by Karen Key of Sacramento, California.)

2. O'Shaughnessy Dam. Wikipedia entry (Submitted on July 29, 2007, by Karen Key of Sacramento, California.)

3. Restore Hetch Hetchy. There are organizations seeking to drain the reservoir and restore Hetch Hetchy Valley to its natural condition. (Submitted on July 29, 2007, by Karen Key of Sacramento, California.)

4. Hetch Hetchy Railroad. The Hetch Hetchy Railroad, a 68 mile standard gauge Class III railroad, operated from 1917 to 1949. (Submitted on July 29, 2007, by Karen Key of Sacramento, California.)

5. Virtual Museum of the City of San Francisco. M.M. O'Shaughnessy Employed as City Engineer (Submitted on July 29, 2007, by Karen Key of Sacramento, California.)

6. San Francisco Public Library. Historical photographs, mainly of the Hetch Hetchy Railroad. (Submitted on July 29, 2007, by Karen Key of Sacramento, California.)

75th Anniversary of the Completion of the O'Shaughnessy Dam image. Click for full size.

Photographed By Karen Key, June 22, 2007

4. 75th Anniversary of the Completion of the O'Shaughnessy Dam

O'Shaughnessy Dam Markers image. Click for full size.

Photographed By Karen Key, June 22, 2007

5. O'Shaughnessy Dam Markers

O'Shaughnessy Dam in the distance image. Click for full size.

Photographed By Karen Key, June 22, 2007

6. O'Shaughnessy Dam in the distance

O'Shaughnessy Dam image. Click for full size.

Photographed By Karen Key, June 22, 2007

7. O'Shaughnessy Dam

Photographed By Karen Key, June 22, 2007

8. O'Shaughnessy Dam

Photographed By Karen Key, June 22, 2007

9. O'Shaughnessy Dam

Photographed By Karen Key, June 22, 2007

10. O'Shaughnessy Dam

Photographed By Karen Key, June 22, 2007

11. Canyon Power Tunnel

Canyon Power Tunnel - Looking back towards the dam image. Click for full size.

Photographed By Karen Key, June 22, 2007

12. Canyon Power Tunnel - Looking back towards the dam

Hetch Hetchy Reservoir — Kolana Rock image. Click for full size.

Photographed By Karen Key, June 22, 2007

13. Hetch Hetchy Reservoir — Kolana Rock

Hetch Hetchy Reservoir — Wapama Falls image. Click for full size.

Photographed By Karen Key, June 22, 2007

14. Hetch Hetchy Reservoir — Wapama Falls

O'Shaughnessy Dam - Boat Hoist image. Click for full size.

Photographed By Karen Key, June 22, 2007

15. O'Shaughnessy Dam - Boat Hoist

Hetch Hetchy Reservoir image. Click for full size.

Photographed By Karen Key, June 22, 2007

16. Hetch Hetchy Reservoir

Credits. This page was last revised on December 28, 2020. It was originally submitted on July 29, 2007, by Karen Key of Sacramento, California. This page has been viewed 4,371 times since then and 99 times this year. It was the Marker of the Week September 9, 2007. Photos: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16. submitted on July 29, 2007, by Karen Key of Sacramento, California. • J. J. Prats was the editor who published this page.