National Levee DatabaseThis feature layer, utilizing National Geospatial Data Asset (NGDA) data from the U.S. Army Corps of Engineers (USACE), displays levees within the United States. Per USACE, "the National Levee Database (NLD)...is the focal point for comprehensive information about our nation's levees. The database contains information to facilitate and link activities, such as flood risk communication, levee system evaluation for the National Flood Insurance Program (NFIP), levee system inspections, flood plain management, and risk assessments."Borehole 4417002501 & the Mississippi River East Bank System - Southern Louisiana Leveed AreaData currency: This cached Esri federal service is checked weekly for updates from its enterprise federal source (NLD2_PUBLIC) and will support mapping, analysis, data exports and OGC API – Feature access.Data.gov: Not AvailableGeoplatform: Not AvailableOGC API Features Link: (National Levee Database - OGC Features) copy this link to embed it in OGC Compliant viewersFor more information, please visit: National Levee DatabaseFor feedback please contact: Esri_US_Federal_Data@esri.comThumbnail image courtesy of: U.S. Army Corps of Engineers Kansas City DistrictNGDA Data SetThis data set is part of the NGDA Water - Inland Theme Community. Per the Federal Geospatial Data Committee (FGDC), Water - Inland is defined as the "interior hydrologic features and characteristics, including classification, measurements, location, and extent. Includes aquifers, watersheds, wetlands, navigation, water quality, water quantity, and groundwater information."For other NGDA Content: Esri Federal Datasets

The National Levee Database is a Congressionally authorized database that documents levees in the United States. The NLD is maintained and published by the U.S. Army Corps of Engineers (USACE).The NLD contains information about the condition and risk information for approximately 2,000 levee systems (approximately 15,000 miles/mostly levees affiliated with USACE programs. An additional 6,000 levee systems--approximately 15,000 miles--have location information, but little to no information about condition and risk. One of the goals for the NLD is to include data about levees owned and operated by all other federal agencies, tribes, states, municipalities, levee boards, and private entities. This information will be added as it becomes available. United State Army Corps of Engineers NLD mission statement.The full NLD as an AGOL Feature Layer.

The National Levee Database is a dynamic, searchable inventory of information about levees, and a key resource supporting decisions and actions affecting levee safety. Â It provides information about the location and condition of levees and floodwalls, displayed in an easy-to-use map interface, as well as reports, inspection summaries, and other records. Â It includes detailed information about the levees in the Levee Safety Program, as well as a growing library of available information on levees outside of the USACE program.

Congressionally mandated national levee safety dataset for the nations levees. Includes over 20 geospatial features and hundreds of business attributes.

The National Levee Database is authoritative database that describes the location and condition of the Nationâ s levees. The database contains 21 feature classes and associated levee business tables in a relational geodatabase. The spatial accuracy of the data is of mixed quality documented in each feature class. The levee data is available for the United States at the website at nld.usace.army.mil.

When visiting the page, a user can get a web service of the data by selecting WEB-GIS SERVICE from the MORE dropdown. This provides the link (https://levees.sec.usace.army.mil/mapserver/public/ows) to the web service. Information on how to access this service is included here: http://usace-cwbi-prod-nld2-docs.s3.amazonaws.com/downloads/NLD_Web_GIS_Service_User_Guide.pdf.

This link provides information and additional metadata related to the US Army Corps of Engineers National Levee Database.

File geodatabase of potential levees in the contiguous U.S. "HUC" denotes the 2-digit HUC basin and "lev_length" is an estimate of the potential levee length in meters.

Though levees are a widely used flood mitigation infrastructure in the United States, levees displace inundation, shifting flood risk to nearby areas with substantial environmental and social justice implications. To support research on whole-channel hydraulic and morphologic shifts associated with levee construction, this dataset defines the upstream, downstream, cross-stream, and leveed hydraulic reach of 60 levees constructed between 1995 and 2005 in the USACE National Levee Database 2 ("NLD2", https://ags03.sec.usace.army.mil/server/rest/services/NLD2_PUBLIC/FeatureServer).

Each shapefile is named using the "Levee ID" in the NLD2. Each shapefile contains 4-8 polygons corresponding with different hydraulic reaches (upstream, downstream, adjacent, protected/leveed), with multiple hydraulic reaches of the same class indicating a multi-channel levee. The attribute "Polygon" in each shapefile contains a letter indicating the class of hydraulic reach. 1.P--Protected: the land surface area between the channel center and extended floodplain. The levee was constructed to reduce flood risk in this area. 2. A--Adjacent: the land surface area on the same side of the levee as the affected water body, or across the channel from the water body. 3. S--Setback: a design feature used to reduce along-channel flooding. The land surface area between the levee and channel; the NLD will detail whether or not a setback has been included in design. 4/5. U/D-- Upstream/Downstream: this is the land surface area within the affected channel floodplain and within the upstream and downstream hydraulic reach of the structure where there may be hydraulic impacts (alterations in the discharge/inundation relationship) with levee construction.

The National Levee Database captures all known levees in the United States. It provides users with the ability to search for specific data about levees and serves as a national resource to support awareness and preparedness around flooding. The U.S. Army Corps of Engineers (USACE) is responsible for maintaining the National Levee Database and works in partnership with the Federal Emergency Management Agency (FEMA), and in close collaboration with other federal, state, and local governments and entities responsible for levees to obtain and share accurate and complete information.Key data available includes the location of levees, people and assets behind the levee, responsible entity, and other information. Since publishing the National Levee Database in 2011, efforts have been made to improve the accuracy of available data and add new information for additional levees in partnership with those who own, operate, or provide oversight to levees.

The sea level rise (SLR) coastal inundation layers were created using existing federal products: the (1) NOAA Coastal Digital Elevation Models (DEMs) and (2) 2022 Interagency Sea Level Rise Technical Report Data Files. The DEMs for the Continental United States (CONUS) are provided in North American Vertical Datum 1988 (NAVD 88) and were converted to Mean Higher High Water (MHHW) using the NOAA VDatum conversion surfaces; the elevation values are in meters (m). The NOAA Scenarios of Future Mean Sea Level are provided in centimeters (cm). The MHHW DEMs for CONUS were merged and converted to cm and Scenarios of Future Mean Sea Level were subtracted from the merged DEM. Values below 0 represent areas that are below sea level and are “remapped” to 1, all values above 0 are remapped to “No Data”, creating a map that shows only areas impacted by SLR. Areas protected by levees in Louisiana and Texas were then masked or removed from the results. This was done for each of the emissions scenarios (Lower Emissions = 2022 Intermediate SLR Scenario Higher Emissions = 2022 Intermediate High SLR Scenario) at each of the mapped time intervals (Early Century - Year 2030, Middle Century - Year 2050, and Late Century - Year 2090). The resulting maps are displayed in the CMRA Assessment Tool. County, tract, and tribal geographies summaries of percentage SLR inundation were also calculated using Zonal Statistics tools. The Sea Level Rise Scenario year 2020 is considered “baseline” and the impacts are calculated by subtracting the baseline value from each of the near-term, mid-term and long-term timeframes. General Disclaimer The data and maps in this tool illustrate the scale of potential flooding, not the exact location, and do not account for erosion, subsidence, or future construction. Water levels are relative to Mean Higher High Water (MHHW) (excludes wind driven tides). The data, maps, and information provided should be used only as a screening-level tool for management decisions. As with all remotely sensed data, all features should be verified with a site visit. Hydroconnectivity was not considered in the mapping process. The data and maps in this tool are provided “as is,” without warranty to their performance, merchantable state, or fitness for any particular purpose. The entire risk associated with the results and performance of these data is assumed by the user. This tool should be used strictly as a planning reference tool and not for navigation, permitting, or other legal purposes. SLR visualizations and statistics are not available in CMRA for Hawaii, Alaska, or U.S. territories at this time. Levees Disclaimer Enclosed levee areas are displayed as gray areas on the maps. Major federal leveed areas were assumed high enough and strong enough to protect against inundation depicted in this viewer, and therefore no inundation was mapped in these regions. Major federal leveed areas were taken from the National Levee Database. Minor (nonfederal) leveed areas were mapped using the best available elevation data that capture leveed features. In some cases, however, breaks in elevation occur along leveed areas because of flood control features being removed from elevation data, limitations of the horizontal and vertical resolution of the elevation data, the occurrence of levee drainage features, and so forth. Flooding behind levees is only depicted if breaks in elevation data occur or if the levee elevations are overtopped by the water surface. At some flood levels, alternate pathways around—not through—levees, walls, dams, and flood gates may exist that allow water to flow into areas protected at lower levels. In general, imperfect levee and elevation data make assessing protection difficult, and small data errors can have large consequences. Citations 2022 Sea Level Rise Technical Report - Sweet, W.V., B.D. Hamlington, R.E. Kopp, C.P. Weaver, P.L. Barnard, D. Bekaert, W. Brooks, M. Craghan, G. Dusek, T. Frederikse, G. Garner, A.S. Genz, J.P. Krasting, E. Larour, D. Marcy, J.J. Marra, J. Obeysekera, M. Osler, M. Pendleton, D. Roman, L. Schmied, W. Veatch, K.D. White, and C. Zuzak, 2022: Global and Regional Sea Level Rise Scenarios for the United States: Updated Mean Projections and Extreme Water Level Probabilities Along U.S. Coastlines. NOAA Technical Report NOS 01. National Oceanic and Atmospheric Administration, National Ocean Service, Silver Spring, MD, 111 pp. https://oceanservice.noaa.gov/hazards/sealevelrise/noaa-nostechrpt01-global-regional-SLR-scenarios-US.pdf

Data from various disparate sources has been brought together to form to global delta protection measures database. This includes electronic (streaming) sources of geospatial data [ex: US Army Corps of Engineers' National Levees Database, UK Environment Agency Asset Information Management System] and raster data (ex: dike/levee maps, historical records, flood management data, reports, business plans). These have then been synthesised together to create the delta protection database.Where present, information on the flood protection measure has been included, however due to the various standards and publishing methods, this information is unfortunately not published for each and every system.

The following are a list of assumptions made during the modeling process. This is not an inclusive list. Levees and levee closure structures were included in the analysis only if they were listed in the US Army Corps of Engineers' National Levee Database (NLD). No levee breach analyses were completed: levees were assumed to perform until overtopped. Bridges and culverts were modeled unobstructed: ice Jams and debris collection were not considered. Inundation boundaries were only developed for the listed stream: tributaries were not taken into account. Lakes, ponds, and lagoons were assumed dry until overtopped.. The critical facilities layer is draft and subject to change at any time. The models used to develop the inundation boundaries and depth grids were developed using the best available topographic, land use, and flood insurance study data, as well as best engineering practices at the time of their development. Any change to the topography or land use will impact the accuracy of the inundation boundaries. These are not regulatory models and were developed solely for informational purposes. Any use of these models or modifications beyond that are not recommended, but may be conducted based on the discretion of a licensed professional engineer. The Department of Natural Resources makes no claims, representations, and warranties, express or implied, concerning the validity, the reliability, or the accuracy of the data and data products furnished by the Department. The Department of Natural Resources assumes no liability for any errors, omissions, or inaccuracies in the information provided regardless of their cause, or for any decision made, action taken, or action not taken in reliance upon the information contained in these models. All models and reports are available from NeDNR, upon request.

National Levee Inventory for Florida provided by FEMA region 4 - September 8, 2017

description: The National Flood Hazard Layer (NFHL) data incorporates all Digital Flood Insurance Rate Map(DFIRM) databases published by FEMA, and any Letters Of Map Revision (LOMRs) that have been issued against those databases since their publication date. The DFIRM Database is the digital, geospatial version of the flood hazard information shown on the published paper Flood Insurance Rate Maps(FIRMs). The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The NFHL data are derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). The specifications for the horizontal control of DFIRM data are consistent with those required for mapping at a scale of 1:12,000. The NFHL data contain layers in the Standard DFIRM datasets except for S_Label_Pt and S_Label_Ld. The NFHL is available as State or US Territory data sets. Each State or Territory data set consists of all DFIRMs and corresponding LOMRs available on the publication date of the data set.; abstract: The National Flood Hazard Layer (NFHL) data incorporates all Digital Flood Insurance Rate Map(DFIRM) databases published by FEMA, and any Letters Of Map Revision (LOMRs) that have been issued against those databases since their publication date. The DFIRM Database is the digital, geospatial version of the flood hazard information shown on the published paper Flood Insurance Rate Maps(FIRMs). The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The NFHL data are derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). The specifications for the horizontal control of DFIRM data are consistent with those required for mapping at a scale of 1:12,000. The NFHL data contain layers in the Standard DFIRM datasets except for S_Label_Pt and S_Label_Ld. The NFHL is available as State or US Territory data sets. Each State or Territory data set consists of all DFIRMs and corresponding LOMRs available on the publication date of the data set.

National Levee DatabaseThis feature layer, utilizing National Geospatial Data Asset (NGDA) data from the U.S. Army Corps of Engineers (USACE), displays levees within the United States. Per USACE, "The National Levee Database captures all known levees in the United States. It provides users with the ability to search for specific data about levees and serves as a national resource to support awareness and preparedness around flooding. The USACE is responsible for maintaining the National Levee Database and works in partnership with the Federal Emergency Management Agency (FEMA), and in close collaboration with other federal, state, and local governments and entities responsible for levees to obtain and share accurate and complete information."Leveed area in Morrisville, PennsylvaniaData downloaded: 4/24/2024Data source: NLD 2 PublicNGDAID: 161 (National Levee Database)OGC API Features Link: (National Levee Database - OGC Features) copy this link to embed it in OGC Compliant viewersFor more information, please visit: National Levee DatabaseSupport documentation: NLD Data DictionaryFor feedback please contact: Esri_US_Federal_Data@esri.comNGDA Data SetThis data set is part of the NGDA Water - Inland Theme Community. Per the Federal Geospatial Data Committee (FGDC), Water - Inland is defined as the "interior hydrologic features and characteristics, including classification, measurements, location, and extent. Includes aquifers, watersheds, wetlands, navigation, water quality, water quantity, and groundwater information."For other NGDA Content: Esri Federal Datasets

National Levee DatabaseThis feature layer, utilizing National Geospatial Data Asset (NGDA) data from the U.S. Army Corps of Engineers (USACE), displays levees within the United States. Per USACE, "The National Levee Database captures all known levees in the United States. It provides users with the ability to search for specific data about levees and serves as a national resource to support awareness and preparedness around flooding. The USACE is responsible for maintaining the National Levee Database and works in partnership with the Federal Emergency Management Agency (FEMA), and in close collaboration with other federal, state, and local governments and entities responsible for levees to obtain and share accurate and complete information."Leveed area in Morrisville, PennsylvaniaData downloaded: 4/24/2024Data source: NLD 2 PublicNGDAID: 161 (National Levee Database)OGC API Features Link: (National Levee Database - OGC Features) copy this link to embed it in OGC Compliant viewersFor more information, please visit: National Levee DatabaseSupport documentation: NLD Data DictionaryFor feedback please contact: Esri_US_Federal_Data@esri.comNGDA Data SetThis data set is part of the NGDA Water - Inland Theme Community. Per the Federal Geospatial Data Committee (FGDC), Water - Inland is defined as the "interior hydrologic features and characteristics, including classification, measurements, location, and extent. Includes aquifers, watersheds, wetlands, navigation, water quality, water quantity, and groundwater information."For other NGDA Content: Esri Federal Datasets

This line feature class contains levee centerlines for EPA Region 9. The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that comprise the nation's surface water drainage system. Medium resolution NHD is based on the content of the U.S. Geological Survey 1:100,000-scale Digital Line Graph (DLG) hydrography data, integrated with reach-related information from the U.S. Environmental Protection Agency Reach File Version 3.0 (RF3). More specifically, it contains reach codes for networked features and isolated lakes, flow direction, names, stream level, and centerline representations for areal water bodies. Reaches are also defined to represent water bodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee.

The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the sream segments or reaches that comprise the nation's surface water drainage system. Medium resolution NHD is based on the content of the U.S. Geological Survey 1:100,000-scale Digital Line Graph (DLG) hydrography data, integrated with reach-related information from the U.S. Environmental Protection Agency Reach File Version 3.0 (RF3). More specifically, it contains reach codes for networked features and isolated lakes, flow direction, names, stream level, and centerline representations for areal water bodies. Reaches are also defined to represent water bodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee

National Levee DatabaseThis feature layer, utilizing National Geospatial Data Asset (NGDA) data from the U.S. Army Corps of Engineers (USACE), displays levees within the United States. Per USACE, "the National Levee Database (NLD)...is the focal point for comprehensive information about our nation's levees. The database contains information to facilitate and link activities, such as flood risk communication, levee system evaluation for the National Flood Insurance Program (NFIP), levee system inspections, flood plain management, and risk assessments."Borehole 4417002501 & the Mississippi River East Bank System - Southern Louisiana Leveed AreaData currency: This cached Esri federal service is checked weekly for updates from its enterprise federal source (NLD2_PUBLIC) and will support mapping, analysis, data exports and OGC API – Feature access.Data.gov: Not AvailableGeoplatform: Not AvailableOGC API Features Link: (National Levee Database - OGC Features) copy this link to embed it in OGC Compliant viewersFor more information, please visit: National Levee DatabaseFor feedback please contact: Esri_US_Federal_Data@esri.comNGDA Data SetThis data set is part of the NGDA Water - Inland Theme Community. Per the Federal Geospatial Data Committee (FGDC), Water - Inland is defined as the "interior hydrologic features and characteristics, including classification, measurements, location, and extent. Includes aquifers, watersheds, wetlands, navigation, water quality, water quantity, and groundwater information."For other NGDA Content: Esri Federal Datasets