Given californias complex geology and tectonic regime, dam safety is of paramount importance. Outlet conduit design at fault crossings geologic mapping during excavation of the dam foundation identified several bedrock faults crossing the alignment of. Pdf no correlation between anderson reservoir stage level. The reservoir fills part of the linear valley of coyote creek canyon. Pdf no correlation between anderson reservoir stage. The low hills on either side of the road are pressure ridges along the calaveras fault. For a copy of the complete report, use the download link in the sidebar. Calaveras formation and younger bedrock complex took place at this time. The calaveras river watershed is a tributary to the san joaquin river delta system and is located in the calaveras, stanislaus, and san joaquin counties of california.
Start this article has been rated as startclass on the projects quality scale. Calaveras reservoir california fishing map and location information. In addition, originally horizon california geology january 1975 tal layers were forced into a vertical position and the bear mountain and melones fault zones formed with displacements measurable in miles. The calaveras and san andreas faults in and around hollister the calaveras and san andreas faults in and around hollister deborah r. The reservoir is fed mainly by arroyo hondo and calaveras creek. Sep 12, 2015 spicer reservoir, calaveras county, california, dec 10 2017 duration. Pdf documents opened from your browser may not display or print as intended.
Army corps of engineers, 1995, geologic and seismologic investigation, new hogan dam and reservoir, calaveras. San jose state university sjsu scholarworks masters theses masters theses and graduate research 2002 franciscan complex geology northeast of calaveras reservoir, diablo range, california. Calaveras reservoir panorama view large on black calav. In constant fear of flooding since the deluge of 1907, the city of stockton decided in the 1920s to build the firstand what is still todays onlydam on the calaveras river. Structural traps are formed when the reservoir rock and overlying seal have been deformed by folding or faulting. Field trip to the calaveras and san andreas faults. Calaveras reservoir fishing, santa clara county ca. Calaveras, the hayward, and other faults that splay from the central segment of the calaveras fault in the vicinity of calaveras reservoir. This arrangement of the reservoir and seals is called a trap4, 5 figure 1.
Escarpment and linear ridge pressure ridge on the calaveras fault along the east side of highway 25 north of downtown hollister. The california geotour is an index of web pages of geologic field trip guides and related web sites. Calaveras reservoir byron hot springs big basin ano nuevo altamont warm springs dam duncans mills drakes bay oe w drakes bay oe sw tombs creek stewarts point oe w stewarts point saunders reef plantation oe w plantation mcguire ridge gube mountain gualala fort ross cloverdale cazadero bodega head big foot mountain arched rock. Hinds california division of mines bulletin 158, 1952. If you like rocks, and you are attracted to tremendous forces and you have plenty of time, you will love the geology encountered on this 300 million year old drive. Usgs current conditions for usgs 11173490 calaveras reservoir. The calaveras fault zone runs along the western shore of the reservoir and the dam itself straddles or was constructed within the fault zone.
The watershed above new hogan reservoir covers 363 square miles and average annual runoff is about 166,000 acrefeet. Fishing in calaveras reservoir is it open to the public yet. Lake or reservoir water surface elevation above ngvd 1929, feet most recent instantaneous value. Dam is located on calaveras creek in the diablo mountain range in alameda county, california, approximately 12 miles south of the city of pleasanton and 7. Petrology of eocene carbonates in the wasatch formation, southwestern wyoming, john robert hawk. Coyote reservoir is an exceptional geology fieldtrip destination. Prepared by john dennis and randy myers inland fisheries division san antonio district. Hart program manager division of mines and geology 380 civic dr. We have listed web pages that contain geologic information, including photographs, maps, text and directions for. Free topo maps of the most popular reservoirs in calaveras county, ca with gps coordinates, pictures, and more. Calaveras road to close weekdays between milpitas and sunol. The spillway of new melones lake has been excavated in rocks of the western sierra nevada metamorphic belt. Barbara pierce, chair of the bay area water supply and conservation agency. Information sheet california state water resources.
Army corps of engineers, 1995, geologic and seismologic investigaiton, new hogan dam and reservoir, calaveras county. Forms terrane between 36 deg n and 38 deg 45n bounded on west by melones fault zone and kingskaweah suture and on east by rocks of sierra nevada batholith. Preliminary geologic map of the calaveras reservoir. A listing of all the reservoirs in calaveras county, ca with maps, driving directions, and a local area search function. Geomorphic study of searsville lake watershed, portola valley, california, caroline frey. This is the third part of an ongoing series about the geology of the mother lode. Prepared by randy myers and john dennis inland fisheries division district 1d, san antonio, texas. Bay area plants found along this trail are rare in rest of park.
Field trip october 24, 2014 calaveras dam replacement project. Calaveras complex formerly calaveras formation is defined as younger of two paleozoic metamorphic complexes that lie east of melones fault zone. When full, it provides more than half of our bay area storage capacity for 2. Franciscan complex geology northeast of calaveras reservoir, diablo range, california, ron s. Geologic map of the san andreas quadrangle, calaveras. Aug 26, 2019 the california geotour is an index of web pages of geologic field trip guides and related web sites compiled by the california geological survey cgs for the benefit of all who have wondered about californias geologic features. Geologic map of the region around the lake calavera hills volcano and lake calavera. Field trip to the ancient shorelines and the calavera hills volcano. The reservoir level was lowered to less than 40 percent of capacity in 2001 due to seismic safety. List of certified engineering geologists pdf who are licensed by the state of california and have indicated. Calaveras dam replacement project united states society on dams. Pardee reservoir tunnel leakage report jacobs associates 2 rev.
In addition, originally horizon california geologyjanuary 1975 tal layers were forced into a vertical position and the bear mountain and melones fault zones formed with displacements measurable in miles. Geology, however, as a science, cannot explain why the incredible views are scenic, but rather it attempts to explain the underlying landscape and how it came to be. For best results viewing and printing pdf documents, it is recommended that you download the documents to your computer and open them with adobe reader. The existing earth fill dam is 89 years old and is located within 1,500 feet of the active calaveras earthquake fault. Migration from source to reservoir tu delft opencourseware. The calaveras dam replacement project consists of building a new zoned earth and rock fill dam immediately downstream of the existing dam. A sag pond and low linear scarp along a second strand. If you like rocks, and you are attracted to tremendous forces and you have plenty of time, you will love the. Lake calaveras is a small manmade reservoir that is host to. Geologic map of the san andreas quadrangle, calaveras county. Geology and landslides at calaveras reservoir, alameda and santa clara counties, ca.
Overview of the geology of the san francisco bay region. Lying in the calaveras valley, the region is geologically active with the calaveras fault parallel to and to the west of the dam site. Excellent views of the park, calaveras reservoir and south bay area. No correlation between anderson reservoir stage level and underlying calaveras fault seismicity despite calculated differential stress increases article pdf available in lithosphere 34. Structural traps are formed when the reservoir rock and overlying seal have been deformed by folding or. The melones fault is the mother lode, john kramer said in an interview. Calaveras reservoir fishing near milpitas, california. Calaveras reservoir is a lake in santa clara county, california and can be found on the calaveras reservoir usgs topo map.
On february 26, 2002 the santa clara board of supervisors officially adopted the county geologic hazards zones ghz and the revised ordinance the ghzs were produced by combining information from a variety of published and unpublished sources regarding the location and extent of possible faults, landslides, compressible soils, dike failure flooding, and liquefaction. The reservoir level was lowered to less than 40 percent of. Calaveras dam replacement project san francisco public. Spicer reservoir, calaveras county, california, dec 10 2017 duration. More information about viewing, downloading, and printing report files can be found here. Calaveras reservoir is a lake located primarily in santa clara county, california with a small portion and its dam in alameda county, california.
Download the latest version of adobe reader, free of charge. Pdf the potential for earthquake rupture of the northern. Santa cruz mountains and the active calaveras and hayward faults along the. The site chosen for the project, about twoandahalf miles south of valley springs, was a settlement called. Calaveras dam, which creates the reservoir, used to be the largest earthfill dam in the world. Jul 01, 2016 calaveras reservoir is the hetch hetchy regional water systems largest bay area reservoir. I pore tyne vs flud reservoir tvpes discover exoiore develoa refine exit done start porosity next porosity is defined as the ratio of the volume of empty space or pores to the total volume of rock. Summary of geologic units near calaveras dam and reservoir. Geology and slope stability of part of pleasanton ridge, alameda county, california winners of the the harrington award established to honor university theses of the highest quality in the college of science. Calaveras reservoir fishing, santa clara county ca calaveras. Preliminary quaternary geologic maps of santa clara valley. The replacement dam will have a structural height of 220feet high and is designed to accommodate a maximum credible earthquake on the calaveras fault. Partial facsimile of the excellent mineralogical record article. Preliminary geologic map of the calaveras reservoir quadrangle, alameda and santa clara counties, california openfile report 7358 by.
Quaternary geology of calaveras reservoir quadrangle. The reservoir has a capacity of 100,000 acreft 120,000 dam. According to bateman 1974, the mountains formed during the. Please find enclosed, and under separate cover, the following geologic. The calaveras reservoir, when full, is the largest bay area reservoir, accounting for 40 percent.
Pdf since 1969 virtually no seismicity has occurred on the calaveras fault north of the calaveras reservoir and south of danville. There are two main types of traps, structural and stratigraphic 4, 5. The calaveras and san andreas faults in and around hollister 39. Geological maps and data planning and development county of.
The two principal properties required from a rock to be a viable reservoir rock are porosity and. Royal mountain king mine meridian beartrack company meridian gold company and felix mining company calaveras county royal mountain king mine rmkm is west of highway 4 and south of rock creek road near the town of copperopolis, calaveras county. The calaveras reservoir, impounded by calaveras dam, is our systems largest drinking water reservoir in the local bay area. Calaveras reservoir is the hetch hetchy regional water systems largest bay area reservoir. Calaveras road to close weekdays between milpitas and. Field trip 6 the calaveras and san andreas faults in and. Calaveras reservoir is located primarily in santa clara county, california, with a small portion and its dam in alameda county, california. Sep 21, 2008 calaveras reservoir is a lake located primarily in santa clara county, california with a small portion and its dam in alameda county, california. Landslide inventory map of the calaveras reservoir quadrangle. This belt forms part of the western limb of a north westtrending faulted synclinorium a broad regional syncline on which are superimposed minor folds, the axial part of which is occupied by the granitic rocks of the sierra nevada batholith. Franciscan complex geology northeast of calaveras reservoir. I pore tyne vs flud reservoir tvpes discover exoiore develoa refine exit done start porosity next porosity is defined as the ratio of the volume of empty.
The rocks of the calaveras complex accumulated in this subduction zone. Detailed forecast tide charts and tables with past and future low and high tide times. Milpitas, california 95035 february 9, 1988 eorl w. Masters theses and graduate research geology san jose. Calaveras reservoir is within the scope of wikiproject lakes, a collaborative effort to improve the coverage of lakerelated articles on wikipedia, using the tools on the project page. Oil and gas migration are the least understood processes in the formation of hydrocarbon reservoirs. San francisco public utilities commission calaveras dam. Calaveras dam forms calaveras reservoir, which is situated on the border between alameda and. When full, it provides more than half of the systems local storage capacity for 2. No rainbows, no steelies, no pinks, no perch, no muskies. For further discussion of the calaveras fault northwest of hollister, please see the discussion included with stop 1. Lying in the calaveras valley, the region is geologically active with the calaveras fault parallel to. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.
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