This file (SWSHED12) is a statewide digital watershed file. It was created primarily for state and federal agency use. The watersheds define Strahler (Strahler 1952 p. 1120) third order stream drainage by contours on U.S. Geological Survey (USGS) 7.5 minute quadrangle map sheets. Some watersheds drainage areas were defined for streams less than third order and some large area watershed were split to maintain a maximum size of 15,000 acres. The watershed boundaries in this file were developed in a joint state and federal effort to create a consistent watershed file for use by all government agencies with an interest in Maryland's watersheds. The U.S. Natural Resources Conservation Service (NRCS) redefined the third order watersheds creating the HUA14 file. This file contains all of the HUA14 watersheds and some added watersheds to maintain water quality sampling sites. It was also used to create the Maryland Sub-Watershed file.The Department of Natural Resources makes no warranty, expressed or implied, as to the use or appropriateness of Spatial Data, and there are no warranties of merchantability or fitness for a particular purpose or use. The information contained in Spatial Data is from publicly available sources, but no representation is made as to the accuracy or completeness of Spatial Data. The Department of Natural Resources shall not be subject to liability for human error, error due to software conversion, defect, or failure of machines, or any material used in the connection with the machines, including tapes, disks, CD-ROMs or DVD-ROMs and energy. The Department of Natural Resources shall not be liable for any lost profits, consequential damages, or claims against the Department of Natural Resources by third parties. The liability of the Department of Natural Resources for damage regardless of the form of the action shall not exceed any distribution fees that may have been paid in obtaining Spatial Data.This is a MD iMAP hosted service layer. Find more information at https://imap.maryland.gov.Feature Service Layer Link:https://mdgeodata.md.gov/imap/rest/services/Hydrology/MD_Watersheds/FeatureServer/2

Sea level rise (SLR) and saltwater intrusion are driving shifts in coastal ecosystems that must migrate to survive. Marsh migration into adjacent uplands is a primary mechanism for sustaining coastal marshes, but potentially limited by natural and anthropogenic barriers. In this study, we focus on the Chesapeake Bay as a case study and combine previous delineations of the marsh-forest boundary and high-resolution topobathymetric data with sea level rise predictions to uniquely assess marsh migration potential on the scale of U.S. Geological Survey HUC10 watersheds. Combining these predictions results in a high-resolution Chesapeake Bay-wide assessment of marsh migration potential through the end of the century. Additionally, we analyze high-resolution land use data within the potential migration area to assess what ecosystems are at risk of loss to marsh via salinization and what potential anthropogenic features exist in the marsh migration corridor. The data consists of 3 files created from analyses conducted during the study: 1) A table summarizing characteristics of the study sites, including elevation and land use, and 2) A zipped Shapefile containing the boundaries of the HUC10 watersheds, 3) A zipped raster (CB_MarshMigrationArea.tif) of elevation categories. Cell values indicate: 1 = area below threshold elevation 2 = area between threshold elevation and 0.5 m of SLR. 3 = area between 0.5 and 1 m of SLR. 4 = area between 1 and 1.5 m of SLR. 5 = area between 1.5 and 2 m of SLR. 6 = area between 2 and 2.5 m of SLR. 7 = area above 2.5 m of SLR. Additionally, uploaded are 10 additional files containing the exact copies of the publicly available data we analyzed to create the above files. To obtain these files from their original sources (i.e. USGS, NOAA, etc) please see the links provided in the Metadata-LO-Letters-dat-V3.rtf file. 1) Points at the marsh-forest boundary 2) Chesapeake Conservancy High-Resolution Land Use 3) Chesapeake Conservancy High-Resolution Land Cover 4) NOAA technical report data 5) 10 Digit Watershed Boundary Dataset: Virginia 6) 10 Digit Watershed Boundary Dataset: Maryland 7) National Wetlands Inventory: Virginia 8) National Wetlands Inventory: Maryland 9) Chesapeake Bay surface salinity 10) USGS CoNED spatial metadata Due to its very large size, not included are USGS CoNED DEM data downloaded from USGS (https://chs.coast.noaa.gov/htdata/raster2/elevation/Chesapeake_Coned_update_DEM_2016_8656/) on 2021-09-16. The area UTM NAD1983 Zone 18N coordinates were: north: 4463434, west: 228360, east: 501230, south: 4045339. All analyses were conducted in ArcDesktop 10.7. All files were projected to UTM Zone 18N and are in reference to NAVD88. Words in all capital letters under variable descriptions indicate a tool used in ArcGIS to complete the processing step.

Maryland geology maps for educational use. Includes geology mapped by formation, by rock class, and by era. Also includes topographic maps, map of major mountains in Maryland, to see how rock units affect topography, physiographic provinces for MD and the US, state and local park boundaries, and watersheds at 3 levels (6-digit, 8-digit, and 12-digit).

The stream reaches are color coded according to the Combined Index of Biotic Integrity (CIBI) scores of the MBSS sites. The CIBI is the average of the fish IBI (FIBI) and the benthic IBI (BIBI). Anything below a CIBI score of 3.0 is red (Poor), 3.0-3.9 is yellow (Fair), and 4.0-5.0 is green (Good). The Maryland Biological Stream Survey (MBSS) was Maryland's first probability-based or random design stream sampling program intended to provide unbiased estimates of stream conditions with known precision at various spatial scales ranging from large 6-digit river basins and medium-sized 8-digit watersheds to the entire state.This is a MD iMAP hosted service layer. Find more information at https://imap.maryland.gov.Feature Service Layer Link:https://mdgeodata.md.gov/imap/rest/services/Hydrology/MD_StreamHealth/FeatureServer/2

This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. The stream reaches are color coded according to the Combined Index of Biotic Integrity (CIBI) scores of the MBSS sites. The CIBI is the average of the fish IBI (FIBI) and the benthic IBI (BIBI). Anything below a CIBI score of 3.0 is red (Poor) - 3.0-3.9 is yellow (Fair) - and 4.0-5.0 is green (Good). The Maryland Biological Stream Survey (MBSS) was Maryland's first probability-based or random design stream sampling program intended to provide unbiased estimates of stream conditions with known precision at various spatial scales ranging from large 6-digit river basins and medium-sized 8-digit watersheds to the entire state. Last Updated: 06/2010 Feature Service Layer Link: http://geodata.md.gov/imap/rest/services/Hydrology/MD_StreamHealth/FeatureServer/2 ADDITIONAL LICENSE TERMS: The Spatial Data and the information therein (collectively "the Data") is provided "as is" without warranty of any kind either expressed implied or statutory. The user assumes the entire risk as to quality and performance of the Data. No guarantee of accuracy is granted nor is any responsibility for reliance thereon assumed. In no event shall the State of Maryland be liable for direct indirect incidental consequential or special damages of any kind. The State of Maryland does not accept liability for any damages or misrepresentation caused by inaccuracies in the Data or as a result to changes to the Data nor is there responsibility assumed to maintain the Data in any manner or form. The Data can be freely distributed as long as the metadata entry is not modified or deleted. Any data derived from the Data must acknowledge the State of Maryland in the metadata.