{ "culture": "en-US", "name": "Solano_NID_Dams", "guid": "33425E4C-3EAA-4C9F-B5D5-6F62609D8047", "catalogPath": "", "snippet": "This dataset is a subset of the National Inventory of Dams for Solano County, California and the supplying waterways in Napa County.", "description": "

The National Inventory of Dams (NID) is a congressionally authorized database maintained and published by the U.S. Army Corps of Engineers (USACE), in cooperation with the Association of State Dam Safety Officials, states/territories, and federal agencies.<\/span><\/p>

Date Accessed: 02/02/2026<\/span><\/p>

Date Downloaded: 02/02/2026<\/span><\/p>

Date Uploaded to Portal: ---<\/span><\/p>

Fields:<\/span><\/p>

  • Dam Name: Official name of the dam. No abbreviations unless the abbreviation is part of the official name. If no official name exists, use the popular name.<\/span><\/p><\/li>

  • Other Names: Names other than the official name (e.g., reservoir name) in common use. Multiple names separated by a semicolon. Blank if not applicable.<\/span><\/p><\/li>

  • Former Names: Previous reservoir or dam name(s), if changed. Multiple names separated by a semicolon.<\/span><\/p><\/li>

  • NID ID: Official National Inventory of Dams identification number (required). Assigned and maintained by State Dam Safety Offices. Typically begins with a two-letter state abbreviation followed by a unique number/alphanumeric identifier.<\/span><\/p><\/li>

  • Other Structure ID: Identification number (e.g., S001, S002) of a separate structure (saddle dam/dike) associated with the dam project. Blank for primary dams.<\/span><\/p><\/li>

  • Federal ID: Unique identifier for each dam record. For associated structures: primary dam\u2019s NID ID + Other Structure ID. Otherwise equals the NID ID.<\/span><\/p><\/li>

  • Owner Names: Name(s) of the dam owner. Multiple owners separated by a semicolon.<\/span><\/p><\/li>

  • Owner Types: Category describing dam owner(s). If more than one owner type, types are separated by a semicolon. Allowed values: Federal; Local Government; Private; Public Utility; State; Tribe; Not Listed.<\/span><\/p><\/li>

  • Primary Owner Type: Primary category describing the owner type. If more than one owner type, the main owner type is used.<\/span><\/p><\/li>

  • Number of Associated Structures: Number of separate structures (saddle dams/dikes) associated with this project. Does not include appurtenant works (spillways, outlet works, conduits, etc.).<\/span><\/p><\/li>

  • Is Associated Structure?: Calculated field. Yes if an Other Structure ID exists (indicating the record is an associated structure to a primary dam).<\/span><\/p><\/li>

  • Designer Names: Name of principal firm(s)/agency responsible for design of the dam and major appurtenant operating features and modifications. Original designer listed first, then modification designers (if any). Names separated by a semicolon.<\/span><\/p><\/li>

  • Non-Federal Dam on Federal Property: Indicates whether this dam is a non-federal dam located on federal property.<\/span><\/p><\/li>

  • Primary Purpose: Main purpose for which the reservoir is used. If more than one purpose, the most important is used.<\/span><\/p><\/li>

  • Purposes: Current purpose(s) for which the reservoir is used. Multiple purposes separated by a semicolon in decreasing importance. The first listed purpose is designated as Primary Purpose. Allowed values: Debris Control; Fire Protection, Stock, Or Small Farm Pond; Fish and Wildlife Pond; Flood Risk Reduction (to include Storm Water Management); Grade Stabilization; Hydroelectric; Irrigation; Navigation; Recreation; Tailings; Water Supply; Other.<\/span><\/p><\/li>

  • Source Agency: Calculated field. Primary state or federal agency responsible for providing and updating NID data for the dam.<\/span><\/p><\/li>

  • State or Federal Agency ID: State or Agency identification number for the dam (if applicable).<\/span><\/p><\/li>

  • Latitude: Latitude at dam centerline as a single value in decimal degrees, NAD83.<\/span><\/p><\/li>

  • Longitude: Longitude at dam centerline as a single value in decimal degrees, NAD83.<\/span><\/p><\/li>

  • State: State where the dam is located.<\/span><\/p><\/li>

  • County: County in which the dam is located.<\/span><\/p><\/li>

  • Nearest Downstream City/Town: Name of the nearest downstream city/town/village most likely to be affected by floods resulting from dam failure.<\/span><\/p><\/li>

  • Distance to Nearest City/Town: Distance from the dam to the nearest affected downstream city/town/village (to the nearest mile, and tenth if appropriate).<\/span><\/p><\/li>

  • River or Stream: Official name of the river/stream on which the dam is built. If unnamed, identify as tributary to a named river (e.g., Snake-TR). If offstream, use river/stream name plus \u201c-OS\u201d (e.g., Snake-OS). Alternative formatting may be provided and converted prior to inclusion.<\/span><\/p><\/li>

  • Congressional District: Calculated field. Congressional District derived from coordinates. Blank if coordinates are not provided.<\/span><\/p><\/li>

  • AIANNH: Calculated field. Name of applicable American Indian/Alaska Native/Native Hawaiian area (reservation/trust land/HHL/etc.).<\/span><\/p><\/li>

  • State Regulated Dam: Calculated field. Yes if State Permitting Authority, State Inspection Authority, State Enforcement Authority, and State Jurisdictional Dam are all Yes; otherwise No.<\/span><\/p><\/li>

  • State Jurisdictional Dam: Yes if the dam meets the state regulatory organization\u2019s definition of a jurisdictional dam.<\/span><\/p><\/li>

  • State Regulatory Agency: Primary state agency with regulatory or approval authority for the dam.<\/span><\/p><\/li>

  • State Permitting Authority: Yes if the state has authority to review/approve plans and specifications to construct, enlarge, remove, and abandon dams.<\/span><\/p><\/li>

  • State Inspection Authority: Yes if the state has authority to require or perform inspections (at least once every five years) for dams posing a significant threat to human life/property in case of failure.<\/span><\/p><\/li>

  • State Enforcement Authority: Yes if the state has authority to require maintenance/remedial work or other actions, including breaching dams when necessary.<\/span><\/p><\/li>

  • Federally Regulated Dam: Calculated field. Yes if a Federal Agency is listed as involved in regulatory aspects of the dam; otherwise No.<\/span><\/p><\/li>

  • Federal Agency Owner: Federal agency that owns the dam (or a component). Multiple agencies separated by a semicolon.<\/span><\/p><\/li>

  • Federal Agency Involvement in Funding: Federal agency/agencies involved in funding. Multiple agencies separated by a semicolon.<\/span><\/p><\/li>

  • Federal Agency Involvement in Design: Federal agency/agencies involved in design. Multiple agencies separated by a semicolon.<\/span><\/p><\/li>

  • Federal Agency Involvement in Construction: Federal agency/agencies involved in construction. Multiple agencies separated by a semicolon.<\/span><\/p><\/li>

  • Federal Agency Involvement in Regulatory: Federal agency/agencies involved in regulation. Multiple agencies separated by a semicolon.<\/span><\/p><\/li>

  • Federal Agency Involvement in Inspection: Federal agency/agencies involved in inspection. Multiple agencies separated by a semicolon.<\/span><\/p><\/li>

  • Federal Agency Involvement in Operation: Federal agency/agencies involved in operation. Multiple agencies separated by a semicolon.<\/span><\/p><\/li>

  • Federal Agency Involvement \u2013 Other: Federal agency/agencies involved in other aspects. Multiple agencies separated by a semicolon.<\/span><\/p><\/li>

  • Built Under the Authority of the Secretary of Agriculture: Indicates whether the dam was designed and built by NRCS through one of the Watershed Program authorizations.<\/span><\/p><\/li>

  • NRCS Watershed Dam Authorization: If applicable, the specific authorization. Allowed values: Flood Control Act of 1944 (Public Law 78-534); 1953 Pilot Watershed Program (Public Law 83-156); Watershed Protection and Flood Prevention Act of 1954 (Public Law 83-566); 1962 Resource Conservation and Development Act (Public Law 87-703).<\/span><\/p><\/li>

  • Primary Dam Type: Main type of dam. If more than one type exists, the most dominant is used.<\/span><\/p><\/li>

  • Dam Type: Dam type(s). Multiple separated by semicolons. Allowed values: Arch; Buttress; Concrete; Earth; Gravity; Masonry; Multi-Arch; Rockfill; Roller-Compacted Concrete; Stone; Timber Crib; Other.<\/span><\/p><\/li>

  • Core: Position, type, and certainty of watertight member. Position: Upstream Facing; Homogeneous dam; Core; Unlisted/Unknown. Type: Bituminous Concrete; Concrete; Earth; Metal; Plastic; Unlisted/Unknown. Certainty: Known; Estimated.<\/span><\/p><\/li>

  • Foundation: Foundation material and certainty. Foundation: Rock; Rock and Soil; Soil; Unlisted/Unknown. Certainty: Known; Estimated.<\/span><\/p><\/li>

  • Dam Height: Height (ft) to nearest foot. Vertical distance between the lowest point on the crest and the lowest point in the original streambed.<\/span><\/p><\/li>

  • Hydraulic Height: Hydraulic height (ft) to nearest foot. Vertical difference between maximum design water level and lowest point in original streambed.<\/span><\/p><\/li>

  • Structural Height: Structural height (ft) to nearest foot. Vertical distance from lowest excavated foundation to the top of the dam (top refers to parapet wall, not crest).<\/span><\/p><\/li>

  • NID Height: Calculated field. Maximum of Dam Height, Structural Height, and Hydraulic Height.<\/span><\/p><\/li>

  • NID Height Category: Calculated field. Based on NID Height: less than 25 ft; 25-49 ft; 50-100 ft; greater than 100 ft.<\/span><\/p><\/li>

  • Dam Length: Length (ft) along the top of the dam including attached spillway/powerplant/navigation lock/fish pass when these form part of the dam length.<\/span><\/p><\/li>

  • Volume (of Dam): Total cubic yards of materials in the dam structure. Includes integral powerhouse/locks/spillways only if integral and required for structural stability.<\/span><\/p><\/li>

  • Year Completed: Four-digit year the original main dam structure was completed. Blank if unknown and no reasonable estimate exists.<\/span><\/p><\/li>

  • Year Completed Category: Calculated field. Category based on Year Completed (e.g., before 1900, 1900-1909, \u2026 Since 2000, Undetermined).<\/span><\/p><\/li>

  • Year Modified: Four-digit year major modifications/rehabilitation were completed.<\/span><\/p><\/li>

  • Modification Type: Type of modification. Allowed values: Foundation; Hydraulic; Mechanical; Seismic; Structural; Other.<\/span><\/p><\/li>

  • NID Storage: Calculated field. Maximum of Normal Storage and Maximum Storage.<\/span><\/p><\/li>

  • Maximum Storage: Maximum storage (acre-feet). Total storage below maximum attainable water surface elevation (includes surcharge storage).<\/span><\/p><\/li>

  • Normal Storage: Normal storage (acre-feet). Total storage below normal retention level (includes dead/inactive; excludes flood control/surcharge). Normally dry dams = 0. Blank if unknown (not zero).<\/span><\/p><\/li>

  • Surface Area: Surface area (acres) of the impoundment at normal retention level.<\/span><\/p><\/li>

  • Drainage Area: Drainage area (square miles) that drains to the dam location.<\/span><\/p><\/li>

  • Maximum Discharge: Spillway discharge capacity (cfs) when reservoir is at maximum designed water surface elevation.<\/span><\/p><\/li>

  • Spillway Type: Type of spillway. Allowed values: Controlled; Uncontrolled; None.<\/span><\/p><\/li>

  • Spillway Width: Width (ft) of spillway available for discharge at maximum designed water surface elevation (open channel: bottom width; pipe/drop inlet: diameter).<\/span><\/p><\/li>

  • Number of Locks: Number of existing navigation locks for the project.<\/span><\/p><\/li>

  • Length of Locks: Length (ft) of the primary navigation lock to the nearest foot.<\/span><\/p><\/li>

  • Lock Width: Width (ft) of the primary navigation lock to the nearest foot.<\/span><\/p><\/li>

  • Length of Secondary Lock: Length (ft) of the secondary navigation lock to the nearest foot.<\/span><\/p><\/li>

  • Secondary Lock Width: Width (ft) of the secondary navigation lock to the nearest foot.<\/span><\/p><\/li>

  • Outlet Gate Type: Type(s) of spillway and controlled outlet gates (up to five types in decreasing size order, separated by semicolons, followed by number of gates). Allowed values: None; Uncontrolled; Tainter (radial); Vertical Lift; Roller; Bascule; Drum; Needle; Flap; Slide (sluice gate); Valve; Other controlled.<\/span><\/p><\/li>

  • Data Last Updated: Calculated field. Date data was submitted to USACE for inclusion in the NID, or date the regulatory agency updated the NID database directly.<\/span><\/p><\/li>

  • Last Inspection Date: Date of the most recent periodic or comprehensive inspection of the dam prior to NID data transmittal.<\/span><\/p><\/li>

  • Inspection Frequency: Scheduled frequency interval for periodic/comprehensive inspections (years).<\/span><\/p><\/li>

  • Hazard Potential Classification: Potential downstream hazard from failure or mis-operation (not a condition/risk rating). Allowed values: Low; Significant; High; Undetermined.<\/span><\/p><\/li>

  • Condition Assessment: Condition based on available information. Allowed values: Satisfactory; Fair; Poor; Unsatisfactory; Not Rated; Not Available.<\/span><\/p><\/li>

  • Condition Assessment Date: Date of the most recent condition assessment prior to NID data transmittal.<\/span><\/p><\/li>

  • Operational Status: Operational/remediation status based on available information. Allowed values: Normal Operations; Under Investigation, Planning, Permitting, or Design for Remediation; Under Remediation; Enforcement Pending/Ongoing; Not Applicable; Not Available.<\/span><\/p><\/li>

  • Operational Status Date: Date of the most recent operational status assessment prior to NID data transmittal.<\/span><\/p><\/li>

  • Emergency Action Plan (EAP Prepared): Indicates whether an Emergency Action Plan is developed by the owner. Allowed values: Yes; No; Not Required (by regulatory agency).<\/span><\/p><\/li>

  • EAP Last Revision Date: Date of the most recent revision of the EAP prior to NID data transmittal.<\/span><\/p><\/li>

  • Last EAP Exercise Date: Date of the most recent EAP exercise (U.S. Army Corps of Engineers dams only).<\/span><\/p><\/li>

  • Emergency Contacts Updated: Date the EAP emergency contact lists were last updated (U.S. Army Corps of Engineers dams only).<\/span><\/p><\/li>

  • EAP Meets FEMA Guidelines: Indicates whether the EAP meets FEMA 64 guidelines (U.S. Army Corps of Engineers dams only).<\/span><\/p><\/li>

  • Inundation Maps Added to NID: Indicates whether inundation maps/scenarios are accessible through the NID.<\/span><\/p><\/li>

  • Website URL: Website for more information on the specific dam or regulatory agency.<\/span><\/p><\/li><\/ul>

    <\/p><\/div><\/div><\/div>", "summary": "This dataset is a subset of the National Inventory of Dams for Solano County, California and the supplying waterways in Napa County.", "title": "Solano_NID_Dams", "tags": [ "solano", "dams", "national inventory of dams", "usace" ], "type": "Feature Service", "typeKeywords": [ "ArcGIS", "ArcGIS Server", "Data", "Feature Access", "Feature Service", "providerSDS", "Service" ], "thumbnail": "thumbnail/thumbnail.png", "url": "", "extent": [ [ -122.2427, 38.0738000000001 ], [ -121.8137, 38.5134 ] ], "minScale": 0, "maxScale": 1.7976931348623157E308, "spatialReference": "WGS_1984_Web_Mercator_Auxiliary_Sphere", "accessInformation": "U.S. Army Corps of Engineers", "licenseInfo": "

    Solano County Disclaimer: By using this data, the user acknowledges that it is possible that errors and omissions will occur in data input or programming done by the County or for the County to provide the GIS layers and/or other data in the form desired. The user further understands and agrees that it is possible that errors and omissions will occur in record keeping processes, especially when large numbers of records are developed and maintained, and that data may not meet the user's standards as to accuracy or completeness. Notwithstanding, the user agrees to take the data \u201cas is\u201d, fully expecting that there may be errors and omissions associated with the data. The user further understands and agrees that the County makes absolutely no warranty whatsoever, whether expressed or implied, as to the accuracy, thoroughness, value, quality, validity, merchantability, suitability, condition or fitness for a particular purpose of the data or any programming used to obtain the data, nor as to whether the data is error-free, up-to-date, complete or based upon accurate or meaningful facts. This data layer was made using Solano County GIS files with varying degrees of scale, accuracy, precision, correctness, and alignment and therefore cannot be used for situations requiring survey grade measurement. Solano County disclaims liability for any loss that may result from the use of its data and user accepts any and all risks associated with using this data. User acknowledges data limitations and accepts responsibility for data based judgments.<\/span><\/p><\/div><\/div><\/div>", "portalUrl": "" }