State of California California Natural Resources Agency Department of Water Resources Division of Safety of Dams Dams Within Jurisdiction of the State of California September 2017 Dams Listed Alphabetically by County Dams Within Jurisdiction of the State of California Dams Listed Alphabetically By County September 2017 Photo used with permission from the City and County of San Francisco DSOD – Data Definitions – Page i Dam Number Unique identification number used for inventorying dams in California based on the jurisdictional status of a dam. This number is assigned and used by the Division of Safety of Dams (DSOD). National Inventory of Dams Identification Number (National ID No.) Unique identification number used for inventorying dams in the U.S. Army Corp of Engineers’ National Inventory of Dams (NID) database. DSOD is responsible for assigning this number for dams in California. Dam Name The dam name as given by the owner, which may not be unique and may differ from the name of the lake. Owner Name The entity or person with legal responsibility for the dam. Owner Type Owners are organized into the following categories: Associations (Home Owners Associations, etc.) City, city agency, or city district County, county agency, or county district Individual owner/Private citizen (Owner Name not provided) Park, sanitation, utility, or water district Private company, corporation, LLC, or partnership Private trusts and estates State Agency Water agency or authority Dam Height Vertical distance from the downstream toe of the dam to the dam crest (measured in feet). Crest Length Distance measured along the dam crest from one abutment to the other (measured in feet). Reservoir Capacity Maximum amount of water that the dam can impound (measured in acre-feet). Dam Type A four letter code describing and categorizing the principal material, style, or construction method of the dam: CORA Constant Radius Arch MULA Multiple Arch CRIB Crib Wall RECT Reinforced Concrete Tank ERRK Earth and Rock ROCK Rock Fill ERTH Earthen Embankment SLBT Slab and Buttress FLBT Flashboard and Buttress VARA Variable Radius Arch GRAV Gravity INFL Inflatable HYDF Hydraulic Fill RCC Roller Compacted Concrete Certified Status The certified status of a dam is one of three statuses: Status Description Jurisdictional sized dams that may safely impound water to the elevation specified on the Certified Certificate of Approval. Jurisdictional sized dams without water impounding capabilities under reasonable Certified/Inop foreseeable conditions, taking into account the size of the drainage area. Jurisdictional sized dams that operate without a Certificate of Approval. Generally, these Not Certified dams are in the process of becoming certified, altered to less than jurisdictional size, or being removed. DSOD – Data Definitions – Page ii Downstream Hazard The downstream hazard is based solely on potential downstream impacts to life and property should the dam fail when operating with a full reservoir. This hazard is not related to the condition of the dam or its appurtenant structures. The definitions for downstream hazard are borrowed from the Federal Guidelines for Inundation Mapping of Flood Risks Associated with Dam Incidents and Failures (FEMA P-946, July 2013). FEMA categorizes the downstream hazard potential into three categories in increasing severity: Low, Significant, and High. DSOD adds a fourth category of “Extremely High” to identify dams that may impact highly populated areas or critical infrastructure, or have short evacuation warning times. Downstream Hazard Loss of Economic, Environmental, Classification Human Life and Lifeline Losses Low None expected Low and generally limited to owner’s property Significant None expected Yes High Probable (one or more expected) Yes, but not necessary for this classification Yes, major impacts to critical infrastructure or Extremely High Considerable property Condition Assessment California DSOD uses NID’s condition rating definitions, with additional criteria, as a guideline in assigning condition assessments. National Inventory of Dams California DSOD Rating Definitions Additional Criteria No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, Satisfactory None hydrologic, seismic) in accordance with the applicable regulatory criteria or tolerable risk guidelines Dam has a long-standing deficiency that is No existing dam safety deficiencies are not being addressed in a timely manner recognized for normal loading conditions. Rare Dam is not certified and its safety is under Fair or extreme hydrologic and/or seismic events evaluation may result in a dam safety deficiency. Risk Dam is restricted and operation of the may be in the range to take further action reservoir at the lower level does not mitigate the deficiency A dam safety deficiency is recognized for loading conditions that may realistically occur. Remedial action is necessary. A poor rating Dam has multiple deficiencies or a significant Poor may also be used when uncertainties exist as deficiency that requires extensive remedial to critical analysis parameters that identify a work potential dam safety deficiency. Further investigations and studies are necessary A dam safety deficiency is recognized that Unsatisfactory requires immediate or emergency remedial None action for problem resolution The dam has not been inspected, is not under Not Rated State jurisdiction, or has been inspected but, None for whatever reason, has not been rated Reservoir Restrictions DSOD may direct or order an owner to operate the reservoir to a specified water surface elevation level that is lower than the maximum storage level. In addition, owners may self-impose a restriction as a result of an owner-initiated study that identifies a dam safety issue. Reservoir restrictions are typically imposed for deficiencies of the dam, spillway, low-level outlet, or other appurtenances with respect to dam safety. SeptemberPage 2017 Jurisdictional Dams 1 Pageof 117 1 of 117 Listed Alphabetically by County Dam Dam Reservoir Certified Condition Dam Name Owner Name County Number Height Capacity Status Assessment National Crest Dam Downstream Reservoir Year Latitude Longitude Owner Type ID No. Length Type Hazard Restrictions Built 31.020 Almond East Bay Municipal Utility District 30 20 Certified Satisfactory Alameda CA00176 37.71 -122.08 Park, sanitation, utility, or water district 1,040 ERTH Extremely High No 1954 1.045 Bethany Forebay California Department of Water Resources 95 5,000 Certified Satisfactory Alameda CA00033 37.78 -121.62 State agency 695 ERTH High No 1961 10.000 Calaveras City and County of San Francisco 210 100,000 Certified Fair Alameda CA00126 37.49 -121.82 City, city agency, or city district 1,200 HYDF Extremely High Yes 1925 31.000 Central East Bay Municipal Utility District 55 485 Certified Satisfactory Alameda CA00162 37.80 -122.22 Park, sanitation, utility, or water district 929 ERTH Extremely High No 1910 31.005 Chabot East Bay Municipal Utility District 142 10,281 Certified Satisfactory Alameda CA00165 37.73 -122.12 Park, sanitation, utility, or water district 450 HYDF Extremely High No 1892 1020.002 Cull Creek Alameda County Public Works Agency 55 140 Certified Satisfactory Alameda CA00840 37.70 -122.06 County, county agency, or county district 440 ERTH High No 1963 1065.004 Decoto Reservoir Alameda County Water District 33 46 Certified Satisfactory Alameda CA00898 37.59 -122.00 County, county agency, or county district 1,360 ERTH Extremely High No 1966 1.056 Del Valle California Department of Water Resources 222 77,100 Certified Satisfactory Alameda CA00043 37.62 -121.75 State agency 880 ERTH Extremely High No 1968 31.018 Dunsmuir Reservoir East Bay Municipal Utility District 43 197 Certified Satisfactory Alameda CA00174 37.74 -122.14 Park, sanitation, utility, or water district 2,275 RECT Extremely High No 1968 1.093 Dyer California Department of Water Resources 30 525 Certified Satisfactory Alameda CA01491 37.76 -121.66 State agency 1,850 ERTH High No 2011 10.021 James H Turner City and County of San Francisco 193 50,500 Certified Satisfactory Alameda CA00132 37.58 -121.85 City, city agency, or city district 2,160 ERTH Extremely High No 1964 1065.002 Middlefield Res Alameda County Water District 147 22 Certified Satisfactory Alameda CA00896 37.53 -121.95 County, county agency, or county district 1,017 ERTH High No 1958 31.031 New Upper San Leandro East Bay Municipal Utility District 182 42,000 Certified Satisfactory Alameda CA01082 37.76 -122.09 Park, sanitation, utility, or water district 1,300 ERTH Extremely High No 1977 1.062 Patterson California Department of Water Resources 39 104 Certified Satisfactory Alameda CA00048 37.70 -121.68 State agency 1,275 ERTH High No 1962 SeptemberPage 2017 Jurisdictional Dams 2 Pageof 117 2 of 117 Listed Alphabetically by County Dam Dam Reservoir Certified Condition Dam Name Owner Name County Number Height Capacity Status Assessment National Crest Dam Downstream Reservoir Year Latitude Longitude Owner Type ID No. Length Type Hazard Restrictions Built 1065.000 Patterson Alameda County Water District 100 46 Certified Fair Alameda CA00895 37.54 -122.08 County, county agency, or county district 1,306 ERTH Significant Yes 1962 31.011 Piedmont East Bay Municipal Utility District 64 60 Certified/Inop Satisfactory Alameda CA00170 37.83 -122.22 Park, sanitation, utility, or water district 250 ERTH High No 1905 1065.009 Quarry