1769 Expedition of Portola and Ortega
1773 Expedition of Moncada and Palou
1776 Presidio Pueblo and Mission San Francisco established by de Anza
1825 Ending of Spanish royal rule in California
1833 Mexican Secularization Act opens California world trade
1835 Trading post established at Yerba Buena cove
1836 First adobe building built at Yerba Buena
1846 JULY 9: Pueblo of Yerba Buena taken by U.S.S. Portsmouth, commanded by Captain R.B. Montgomery. Montgomery appointed his lieutenant, Washington Bartlett, who was bi-lingual, to be the first American Alcalde or Mayor. Bartlett proclaimed the name of the Pueblo to be San Francisco.
1849 Drinking water sold by the barrel and bucket in the streets
1850-1852 San Francisco devastated by fire six times
1851 • Mountain Lake Water Company formed
• Sausalito Water and Steam Tug Company importing water from Marin
1853 Mountain Lake Water Company granted first of several time extensions
1856 • San Mateo lands excluded in San Francisco City and County consolidation
• First pipelines laid in the City
1857 San Francisco City Water Company brings water from Lobos Creek
1858 Spring Valley Water Company franchised by State Legislature
1860 • U.S. Census reports San Francisco population at 78,000
• APRIL: Spring Valley takes over Islais and Salinas Water Company
• Alexi W. von Schmidt becomes Chief Engineer of Spring Valley
1861 Construction of the first Pilarcitos Dam and Tunnel
1862 • Spring Valley Water Works now rivals San Francisco City Water Works
• JULY 4: First peninsula water enters San Francisco
1863 DECEMBER: First Pilarcitos Dam completed
1864 • A.W. von Schmidt leaves Spring Valley
• OCTOBER 8: Calvin Brown, Spring Valley Chief Engineer, hires Hermann Schussler to raise main Pilarcitos Dam
1864 San Francisco City Water Works taps into Spring Valley water main
1865 • Schussler starts second long tunnel on Pilarcitos conduit line
• FEBRUARY 13: Spring Valley buys out San Francisco Water Works
1866 MAY: Schussler named Chief Engineer of Spring Valley Water Works
1867 Main Pilarcitos Dam completed to height of 70 feet
1868 • Spring Valley buys San Andrés Dam
• APRIL: Schussler starts construction of San Andrés Dam
• AUGUST: Spring Valley acquires rights to Lake Merced
1869 Spring Valley Water Works sues San Francisco for water payment for "municipal purposes"
1870 • State legislature considers bill by Lake Tahoe Water Company to tunnel through Sierra Nevada
• San Francisco Mayor Selby vetoes Board of Supervisors' $6 million bond issue as "inappropriate"
• JUNE: Lock's Creek Line Aqueduct (Stone Dam Tunnel #1) started
1871 Stone Dam and Lock's Creek Tunnel completed - Lock's Creek Line developed
1873 First municipal efforts to buy out Spring Valley Water Works
1875 • Schussler raises main Pilarcitos Dam to 95 feet
• San Andrés Dam increased in height
• Spring Valley Water Company buys Calaveras land and water rights
• San Francisco offers to buy out Spring Valley Water Company
• APRIL 19: City Engineer T. R. Scowden recommends San Francisco buy Calaveras site
1876 Upper Crystal Springs Dam constructed
1877 San Francisco offer of $11 million to buy out Spring Valley declined
1880 Newly adopted State Constitution allows Board of Supervisors to fix water rates for San Francisco
1882 MAY: J. P. Dart, San Francisco and Tuolumne Company proposes Tuolumne water for San Francisco
1888 • George Harris offers Tuolumne water rights to Mayor E. P. Bond for $200,0000
• Schussler completes Crystal Springs Dam and first outlet gate tower
1891 • John Quinton surveys Hetch Hetchy and Tuolumne as potential San Francisco water source
• Schussler raises Crystal Springs Dam parapet - builds second outlet gate tower
1898 Use of Lock's Creek Line aqueduct discontinued - drilling starts at Pleasanton Well Field
1899-1900 U. S. Geological Survey annual report recommends Hetch Hetchy for San Francisco water supply
1900 • Sunol aqueduct and Filter Beds completed
• JANUARY 8: New City Charter requires development of municipal water supply
1901 • FEBRUARY 15: Congress permits Interior Sevretary to grant rights-of-way through Yosemite and other National Parks
• JULY 29: As private citizen, Mayor Phelan files for water rights
• AUGUST 12: City Engineer Grunsky recommends Tuolumne after studying 14 possible water systems
• OCTOBER 15: Phelan applies to Interior Secretary for reservoir sites at Hetch Hetchy and Lake Eleanor
1902 Eugene Schmitz becomes Mayor of San Francisco
1903 • Spring Valley Water Company buys out Spring Valley Water Works
• FEBRUARY 20: Phelan assigns all Hetch Hetchy water interests to San Francisco
• JUNE 20: Interior Secreatry Hitchcock denies San Francisco's first application to develop Hetch Hetchy
1906 • Board of Supervisors adopts resolution #6949 formally abandoning the Hetch Hetchy development
• APRIL 18: San Francisco Earthquake disrupts Spring Valley water supply - the City burns for three days
• MAY 26: A. W. von Schmidt dies at age 85
1907 U. S. Geographic Board declares name of San Andrés Valley to be San Andreas
1908 • APRIL 22: City Engineer Marsden Manson files duplicates of Phelan maps with Interior Secretary
• MAY 11: Interior Secretary Garfield gives limited permission for Hetch Hetchy and Lake Eleanor
1909 Hermann Schussler retires from Spring Valley Water
1909-1910 Diversion tunnel constructed at Eleanor damsite
1910 • State Constitution changed - Railroad Commission to fix water rates
• San Francisco votes 20-1 for $45 million bond issue to build Hetch Hetchy system
• FEBRUARY 25: Interior Secretary Ballinger withdraws Hetch Hetchy from Garfield permit
• APRIL 13: City purchases Eleanor Basin lands and water rights for $400,000
• MAY 10: Interior Secretary requests War Secretary to appoint advisory Board of Engineers
• MAY 18: Board of Army Engineers appointed
1911 • Fred C. Herrmann appointed Chief Engineer of Spring Valley
• Crystal Springs Dam parapet raised four feet in height
• JUNE 22: City purchases Cherry Creek Basin land and water rights for $600,000
1912 • Priest Grade road reconstructed
• JANUARY 8: "Sunny Jim" Rolph becomes mayor of San Francisco
• JULY 15: John Freeman publishes his "Freeman Plan" for Hetch Hetchy
• SEPTEMBER 1: Mayor Rolph hires M. M. O'Shaughnessy as City Engineer
• NOVEMBER 30: Hearings before Interior Secretary Fisher concluded
1913 • FEBRUARY 19: Board of Army Enginners report recommends San Francisco develop Hetch Hetchy for $20 million cheaper
• MARCH 1: Interior Secretary Fisher refuses further permits without Congressional authority
• APRIL 7: First of "Hetch Hetchy" bills introduced into Congress
• AUGUST 1: Raker Act introduced in Congress
• SEPTEMBER 3: House adopts Raker Act
• DECEMBER 2: Senate adopts Raker Act
• DECEMBER 6: President Woodrow Wilson signs Raker Act into law
1914 • Spring Valley starts construction of Calaveras Dam
• San Francisco ratifies Raker Act
• Surveys made for Lower Cherry power aqueduct, Moutnain Tunnel and Priest Reservoir
• George A. Elliott succeeds Fred Herrman as Chief Engineer of Spring Valley
• APRIL: Surveys start for Hetch Hetchy Railroad
• JULY: Start of Hog Ranch - Hetch Hetchy and Elearnor Intake roads, present location of Camp Mather
1915 • Preliminary preparation work starts in Hetch Hetchy Valley
• JULY 21: Canyon Ranch sawmill starts operations for Hetch Hetchy
• SEPTEMBER: Diversion tunnel at O'Shaughnessy damsite starts
• DECEMBER 6: Construction of Hetch Hetchy Railroad starts
1916 • Surveys made for Coast Range tunnel
• AUGUST 11: Construction of Lower Cherry Aqueduct starts
1917 • SUMMER: Lower Cherry Diversion Dam completed
• JULY: Drifting Mountain Tunnel begins at Early Intake and South Fork
• AUGUST: Construction starts on Eleanor Dam
• OCTOBER: Construction of Hetch Hetchy Railroad completed - operations start
1918 • JANUARY: Construction of Priest Dam starts
• MARCH 24: Calaveras Dam fails - reconstruction monitored by City Engineer
• MAY 6: Early Intake Powerhouse starts operation
• JUNE: Eleanor Dam completed to a height of 70 feet
• SEPTEMBER 18: Power Administrator orders surplus Early Intake power to PG&E
1919 • Hermann Schussler dies at age 77
• JUNE: Hetch Hetchy sawmill moves to Hog Ranch
1920 JANUARY 16: O'Shaughnessy Dam diversion tunnel completed
1921 • State Railroad Commission directs Spring Valley to raise Calaveras Dam
• FALL: Construction of Moccasin Powerhouse starts
• SEPTEMBER 28: Construction of Priest Dam starts
1922 • JUNE: Construction of Moccasin Power Tunnel starts
• JUNE 23: Construction of Pulgas Tunnel at Crystal Springs starts
• JULY: Construction of Moccasin Penstock starts
• AUGUST 17: San Francisco gets option to buy Spring Valley Water Company - agrees to build Pipeline #1 across San Francisco Bay
1923 • Construction of Calaveras Dam starts
• APRIL 6: O'Shaughnessy Dam completed
• MAY 18: Construction of Bay Crossing Pipeline #1 starts
• JULY 7: O'Shaughnessy Dam dedicated - height 226.6 feet, capacity 206,000 acre feet
• OCTOBER 2: Construction of Early Intake Diversion Tunnel started
• Priest Dam completed
1924 • Sawmill operations at Hog Ranch (Camp Mather) terminated
• Construction of Dumbarton Bridge for Bay Pipeline #1 starts
• MAY: Pulgas Tunnel completed
• AUGUST 28: Upper Crystal Springs Dam Tunnel restored to use
• OCTOBER 7: $10 million bond issue for Foothill and Coast Range Tunnels approved
1925 • Calaveras Dam completed to a height of 215 feet
• APRIL 10: Early Intake Diversion Dam completed
• MAY 2: Moccasin PowerTunnel completed
• JUNE 1: Moccasin Penstock completed
• JUNE 2: Mountain PowerTunnel completed - first water passes to Priest Reservoir
• AUGUST 14: Moccasin Powerhouse complete - begins commercial operations
• SEPTEMBER 12: Bay Crossing Pipeline #1 placed in partial service
• NOVEMBER 27: Hetch Hetchy moves from Groveland to Hetch Hetchy Junction
1926 • FEBRUARY 4: Foothill Tunnel starts from Pedro west face
• MAY 21: Bay Crossing Pipeline #1 enters full service
1927 • APRIL: Construction of Coast Range Tunnel starts
• MAY: Construction of Mocho Shaft on Coast Range Tunnel starts
1928 • San Andreas Dam raised to 105 feet
• MAY 1: $24 million bond issue for Coast Range Tunnel and San Joaquin pipelines approved
• MAY 1: $41 million bons issue to buy Spring Valley Water Company approved
• DECEMBER 6: Foothill Tunnel holed through
1929 • SEPTEMBER: Foothill Tunnel completed
• NOVEMBER: Moccasin Dam and reservoir completed
1930 MARCH 3: San Francisco purchases Spring Valley for $39.96 million - Water Department created under Board of Public Works - Nelson A. Eckert named General Manager and Chief Engineer
1931 Second outlet gate tower built at Crystal Springs Reservoir
1932 • JANUARY 8: New City Charter places Hetch Hetchy and Water Department under Public Utilities Commission - Edward Cahill appointed Utilities General Manager, Lloyd McAfee named General Manager and Chief Engineer of Hetch Hetchy
• MAY 3: $6.5 million bond issue to complete Hetch Hetchy Aqueduct approved
• JULY 9: San Joaquin Pipeline #1 completed
1933 NOVEMBER 7: Two bond issues - $3.5 million to enlarge O'Shaughnessy Dam, and $12.1 million to construct second Bay Crossing Pipeline, Crystal Springs Pipeline, distribution system reservoirs and improve the distribution system approved
1934 • JANUARY 5: Coast Range Tunnel holed through from Mocho to Mitchell shaft
• FEBRUARY 24: Alameda Creek Siphon completed
• AUGUST 24: Construction of Bay Crossing Pipeline #2 started
• OCTOBER 12: Michael M. O'Shaughnessy dies at age 72
• OCTOBER 19: First Hetch Hetchy water passes through Coast Range Tunnel to Alameda Creek
• OCTOBER 24: First Hetch Hetchy water flows into Pulgas Water Temple at 10:12am
• OCTOBER 28: Hetch Hetchy water delivery to San Francisco celebrated at Crystal Springs Lake
1935 • NOVEMBER 18: Construction starts on Moccasin diversion works
• DECEMBER 10: PG&E disconnected from Early Intake Powerhouse - output pooled with Moccasin
1936 • JUNE 22: Bay Crossing Pipeline #2 completed
• AUGUST 31: Moccasin diversion works completed
• DECEMBER 16: Interior Secretary Ickes approves Plan 7 to dispose of Hetch Hetchy electrical power
1938 JULY 1: O'Shaughnessy Dam raised 85.5 feet - capacity 360,000 acre feet
1942 James H. Turner named General Manager and Chief Engineer of Hetch Hetchy
1943 Turlock and Modesto Irrigation Districts participate with San Francisco and Corps of Engineers in Tuolumne flood control
1945 • James H. Turner appointed Utilities General Manager
• Axel O. Olson named General Manager and Chief Engineer of Hetch Hetchy
• JUNE 22: Exploratory work at Cherry Creek damsite starts
• JULY 2: Interior Secretary approves new power disposition contracts as being in compliance with the Raker Act
1946 MAY 11: Hetch Hetchy starts power delivery to Modesto's Station J
1947 NOVEMBER 4: $25 million bond issue approved to construct San Joaquin Pipeline #2 and Bay Division Pipeline #3
1949 • George W. Pracy named Water Department General Manager and Chief Enginner
• Hetch Hetchy Railroad tracks removed
• NOVEMBER 4: $4 million bond issue approved to construct Cherry Valley Dam - Federal aid to be $9 million
1950 • JUNE 9: PUC holds ceremony and opens 33.3 miles of San Joaqun Pipeline #2 west of Oakdale
• DECEMBER: Rock River Lime Treatment Plant completed
1951 JUNE: Construction of 22,000 volt power line from Early Intake to Cherry Valley damsite starts
1952 • Harry E. Lloyd named General Manager and Chief Engineer of Hetch Hetchy
• OCTOBER 17: San Joaquin Pipeline #2 enters service for entire 47.5 mile length
1953 • MARCH 25: San Joaquin Pipelines #1 and #2 operated jointly for the first time
• AUGUST: Construction of Cherry Valley Dam starts
1954 MAY 18: Cherry Creek water diverted at damsite
1955 • OCTOBER 27: Cherry Valley Dam dedicated
• NOVEMBER 8: $54 million bond issue approved to construct Canyon and Cherry Creek power projects
1956 • T. N. Bland appointed Utilities General Manager
• Bay Crossing Pipeline #3 completed
• MARCH 15: First joint operation of Hetch Hetchy and Lake Lloyd reservoirs for flood control
1957 • James H. Turner named Water Department General Manager and Chief Engineer
• AUGUST 30: Construction of Cherry Power and Eleanor-Cherry tunnels started
1958 SEPTEMBER 16: Construction of Cherry Powerhouse started
1959 • Robert Kirkwood appointed Utilities General Manager
• JANUARY 26: Cherry Power Tunnel, 29,278 feet long, is holed through
• APRIL 6: New transmission line - Early Intake to Moccasin - completed
• MAY 18: Eleanor-Cherry Tunnel, 5,854 feet long is holed through
1960 • MARCH 6: First water diversion to Lake Lloyd though Eleanor-Cherry Tunnel
• APRIL 16: New transmission line - Moccasin to Modesto's Station J - completed
• JUNE 17: Cherry Power and Eleanor-Cherry tunnels completed
• AUGUST 1: Cherry Powerhouse begins commercial operation
• AUGUST 25: Early Intake Powerhouse ceases operation after 46 years of service
1961 • Oral L. Moore named General Manager and Chief Engineer of Hetch Hetchy
• FEBRUARY 24: Water delivery to Lawrence Livermore National Laboratory from Mocho Shaft starts
• NOVEMBER 7: $115 million water systembond issue approved
1963 Oral L. Moore named Water Department Acting General Manager - H. Christopher Medbery named Water Department Acting Chief Engineer
1964 JUNE 24: Canyon Power Tunnel, 54,888 feet long, is holed through
1965 • James K. Carr appointed Utilities General Manager • Arthur H. Fry, Jr. named Water Department General Manager and Chief Engineer
• Turner Dam completed to 195 feet forming San Antonio Reservoir
• FEBRUARY 26: Canyon Power Tunnel completed
• JUNE 30: A new record for Hetch Hetchy water delivered to Water Department - 220 million gallons per day
• NOVEMBER 3: First water to Groveland Community Services District from Second Garrotte Shaft
1966 SEPTEMBER 14: Sunol Filtration Plant activated
1967 • MARCH 1: Robert C. Kirkwood Powerhouse starts commercial operation
• SEPTEMBER 1: Construction of New Don Pedro Dam starts
1968 MARCH 29: San Joaquin Pipeline #3 enters service - 300 million gallons per day can be delivered to west end of Coast Range Tunnel - maximum delivery limited to 280 million gallons per day, the capacity of the Bay Division pipelines
1969 • JANUARY 27: New Moccasin Powerhouse begins operation
• FEBRUARY 7: Old Moccasin Powerhouse taken out of service after 44 years
1970 • John D. Crowley appointed Utilities General Manager
• New Don Pedro Dam topped out
1971 MAY 22: New Don Pedro Dam dedicated
1972 • Pilarcitos Dam upstream face repaired
• JUNE 14: Bay Crossing Pipeline #4 completed
• AUGUST 8: San Andreas Filtration Plant activated
1975 • Water Department strengthens Calaveras Dam to meet current earthquake standards
• JULY 1: Main PG&E contract covering power wheeling, supplementary energy and standby service negotiated and extended
1976 • Kenneth R. Boyd named Water Department General Manager and Chief Engineer
• Sunol Filtration Plant expanded to 160 million gallons per day capacity
• Crystal Springs Dam designated Historic Civil Engineering Landmark
1977 • John B. Wentz appointed Utilities General Manager
• NOVEMBER: Seismic study of Lower Crystal Springs Dam completed
1978 Eugene J. Kellerher named Water Department General Manager and Chief Engineer
1979 • Richard Sklar appointed Utilities General Manager
• Dean W. Coffey named General Manager of Hetch Hetchy
1980 • JANUARY: Phase I seismic studu of San Andreas Dam completed
• SEPTEMBER: Suburban Division moves into new headquarters building in Millbrae
1981 FEBRUARY: Water quality laboratory moves to suburban headquarters in Millbrae
1982 FEBRUARY: San Andreas Pipeline #3 placed into service
1983 • Rudolf Nothenberg appointed Utilities General Manger
• FEBRUARY: Phase II seismic study of San Andreas Dam completed
• JUNE: Seismic study of Pilarcitos Dam completed
• FALL: Environmental assessment prepared for proposed 1.5 megawatt plant ($5 million budget) at O'Shaughnessy Dam
1984 • SPRING: Engineering design starts on third generator at Kirkwood Powerhouse
• SPRING: Construction starts on powerline from new Moccasin Low-Head Hydro Project
• SEPTEMBER: Arthur Jensen named Water Department Acting General Manager
• NOVEMBER: Voters approve $104 million water system revenue bonds to build Crystal Springs Filtration Plant and balancing reservoir, and to increase the capacity of San Andreas Filtration Plant
1986 Moccasin low-head generating plant goes into operation
1987 • Fire at Stanislaus complex
• Extended drought commences, 25% mandatory rationing imposed
1988 • Dean W. Coffey appointed Acting Utilities General Manager
• New Crystal Springs Pipeline #3 placed in service between Baden Pump Station and Randolph Street in South San Francisco
• Anson B. Moran named Hetch Hetchy General Manager
• 28 1/2-year Power, Sales, and Support Services contracts signed with Modesto Irrigation District, Turlock Irrigation District and Pacific Gas and Electric
• Kirkwood Powerhouse Unit 3 goes into operation
1989 • Thomas J. Elzey appointed Utilities Gerneral Manager
• OCTOBER 17: Loma Prieta Earthquake strikes, system holds
1990 John P. Mullane maned General Manager of Water Department
1991 • San Andreas Water Treatment Plant, Phase I Expansion to 120 million gallons per day completed
• Drought continues, temporary connection with State Water Project made - Water purchased from State Water Bank and various water agencies
• 45% mandatory rationing imposed until March rains and purchased water permit the return to 25% mandatory rationing
• Memorandum of understanding concerning Urban Water Conservation is signed
• Water Department/Clean Water Reclaimed Water Ordinance passed by Board of Supervisors - Requires water to be reused for irrigation
1992 • San Andreas Water Treatment Plant Phase II expansion to 180 million gallons per day completed - Ozonization capability developed
• Joint Water Department/Public Works Reclaimed Water Study funded for Master Plan
• Groundwater surveys for San Francisco completed by U. S. Geological Survey and consultants
• Water Department assesses feasibility of using local aquifers as additional water sources
• Heavy storms hit Sierra Nevada - reservoirs rise
1993 • Drought officially over - mandatory rationing rescinded
• Anson B. Moran appointed Utilities General Manager
1994 • FEBRUARY: Dedication and renaming of San Andreas Water Treatment Plant as Harry W. Tracy Water Treatment Plant
• JULY: San Francisco Water Department and Hetch Hetchy become the only City departments to be governed by the San Francisco Public Utilities Commission when the San Francisco Municipal Railway is placed under a separate transportation commission

REFERENCE: San Francisco Water and Power: A History of the Municipal Water Department and Hetch Hetchy System by Warren D. Hanson