DAMS WITHIN JURISDICTION OF THE STATE OF CALIFORNIA LISTED ALPHABETICALLY BY DAM NAME SEPTEMBER 2020 CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF SAFETY OF DAMS PHOTO USED WITH PERMISSION FROM THE EL DORADO IRRIGATION DISTRICT 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. 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.” Downstream Hazard Potential Downstream Impacts to Life and Property Potential Classification No probable loss of human life and low economic and environmental losses. Low Losses are expected to be principally limited to the owner’s property. No probable loss of human life but can cause economic loss, environmental Significant damage, impacts to critical facilities, or other significant impacts. High Expected to cause loss of at least one human life. Expected to cause considerable loss of human life or would result in an Extremely High inundation area with a population of 1,000 or more. 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. Jurisdictional Dams Listed Alphabetically by Dam Name Page 1 of 104 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 95-4 #1 Forebay Pacific Gas and Electric Company 19 69 Certified Satisfactory Madera CA00338 37.16 -119.49 Private company, corporation, LLC, partnership 1,572 ERTH Low No 1896 95-12 #2 Reservoir Pacific Gas and Electric Company 30 168 Certified Satisfactory Madera CA00342 37.24 -119.52 Private company, corporation, LLC, partnership 113 CORA High No 1912 95-6 #3 Forebay Pacific Gas and Electric Company 39 20 Certified Fair Madera CA00339 37.25 -119.53 Private company, corporation, LLC, partnership 450 ERTH Low Yes 1906 Count: 3 Jurisdictional Dams Listed Alphabetically by Dam Name Page 2 of 104 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 1049-0 10 MG Walteria City of Torrance 40 31 Certified Satisfactory Los Angeles CA00881 33.79 -118.34 City, city agency, or city district 1,022 RECT High No 1953 1049-2 18 MG Walteria City of Torrance 31 58 Certified Satisfactory Los Angeles CA01193 33.79 -118.34 City, city agency, or city district 1,287 RECT High No 1987 Count: 2 Jurisdictional Dams Listed Alphabetically by Dam Name Page 3 of 104 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 1087-0 30 MG Central Reservoir City of Brea 30 92 Certified Satisfactory Orange CA01113 33.93 -117.91 City, city agency, or city district 1,596 ERTH High No 1924 Count: 1 Jurisdictional Dams Listed Alphabetically by Dam Name Page 4 of 104 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 1836-0 4-S Ranch Reclamation Reservoir Olivenhain Municipal Water District 22 410 Certified Satisfactory San Diego CA01446 33.01 -117.11 Park, sanitation, utility, or water district 1,270 ERTH High No 2000 Count: 1 Jurisdictional Dams Listed Alphabetically by Dam Name Page 5 of 104 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 1110-2 A and C Private Entity 13 800 Certified Satisfactory Modoc CA00915 41.78 -120.80 Individual owner 1,200 ERTH Low No 1923 346-0 A. L. Chaffin Estate of George R. Chaffin 65 450 Certified Satisfactory Butte CA00552 39.60 -121.59 Private trusts and estates 475 ERTH Low No 1957 3462-2 Abrams Private Entity 37 110 Certified Satisfactory El Dorado CA01065 38.85 -120.98 Individual owner 285 ERTH Low No 1950 1011-0 Adobe Creek Lake County Watershed Protection District 36 695 Certified Satisfactory Lake CA00827 38.94 -122.89 Park, sanitation, utility, or water district 1,280 ERTH High No 1962 2463-0 Aeree Pilot Hill Estates Homeowner Association 35 90 Certified Satisfactory El Dorado CA01048 38.84 -121.03 Associations 905 ERTH Significant No 1951 104-38 Agnew Lake Southern California Edison 30 810 Certified Satisfactory Mono CA00454 37.76