This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. The Maryland coastal zone is comprised of the land - water and subaqueous land between the territorial limits of Maryland in the Chesapeake Bay - Atlantic Coastal Bays and the Atlantic Ocean - as well as the towns - cities and counties that contain and help govern the thousands of miles of Maryland shoreline. The Maryland coastal zone extends from three miles out in the Atlantic Ocean to the inland boundaries of the 16 counties and Baltimore City that border the Atlantic Ocean - Chesapeake Bay and the Potomac River up to the District of Columbia. This area encompasses two-thirds of the State s land area and is home to almost 70% of Maryland's residents. Feature Service Layer Link: http://geodata.md.gov/imap/rest/services/Hydrology/MD_Watersheds/FeatureServer/4 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.

This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. This file (SWSUB8) is a statewide digital watershed file. It depicts the State with 138 separate watersheds each with an 8-digit numeric code. The file was created primarily for State and Federal agency use. The creation of this file goes back many years and involved several State and Federal agencies. This file was derived from a more detailed watershed file (Maryland's Third-Order Watershed). The process used to create this file is consistent with the elevation contour information found on the US Geological Survey's 7.5 minute topographic quadrangle maps and the Maryland Department of the Environment's watershed location and naming conventions. This file is similar - but not identical - to the US Natural Resources Conservation Service's (NRCS) Hydrologic Unit Code (HUC11) watershed file. 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 watershed drainage areas were defined for streams less than third order and some large area Watersheds were split to maintain a maximum size of 15 - 000 acres. Feature Service Layer Link: http://geodata.md.gov/imap/rest/services/Hydrology/MD_Watersheds/FeatureServer/1 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.

This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. The intent of this dataset is for it to be used to produce maps and provide a spatial reference for all Tier II segments located in Maryland. The Clean Water Act requires that States review their water quality standards every three years and revise the standards as necessary. During this required Triennial Review the State reviewed the antidegradation policy - and identified additional stream segments that meet the minimum requirements. Current Tier II designations are made based on biological characteristics from Maryland Biological Stream Survey (MBSS) data - which is collected annually. MBSS data which identifies new Tier II segments in between Triennial Review cycles are maintained on the pending list - as they are awaiting formal promulgation. The publicly maintained list of all Tier II waters can be found for each county at the following website: http://mde.maryland.gov/programs/Water/TMDL/Integrated303dReports/Pages/Antidegradation.aspx. This dataset is intended to be used in conjunction with the other official Tier II MDE datasets: Tier II Stream Catchments - Tier II MBSS Stations - and Tier II Stream Endpoints. Feature Service Layer Link: http://geodata.md.gov/imap/rest/services/Hydrology/MD_WaterQuality/FeatureServer/0 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.

This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. Although the State of Maryland has no natural lakes - it has an abundance of created lakes and ponds that are used for wildlife habitat - recreation - water supply - and other reasons. This digital file shows the locations of the largest and most significant lakes - as well as some of the smaller lakes and ponds in the state. Most of the digitized lakes and ponds are greater than 2 acres. Last Updated: Feature Service Layer Link: http://geodata.md.gov/imap/rest/services/Hydrology/MD_Waterbodies/MapServer/3 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.

This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov. The MD_Surface_Waters Feature Dataset includes 7 feature classes that geospatially depict the surface water bodies of Maryland. These feature classes are being provided so that data from the 2012 Integrated Report of Surface Water Quality can be displayed in geographic form for users of all levels. These different feature classes represent the different assessment unit scales utilized on the 2012 IR - some of which overlap in space. In addition - provided in the attribute tables for the Impoundments - Rivers_Streams - and Tidal_Waters feature classes is the use class designation as specified in COMAR Section 26.08.02.08. More information about these feature classes is contained in the metadata for each feature class. Map Service Link: http://mdewin64.mde.state.md.us/arcgis/rest/services/ MDE_Water_Quality/MD_IntegratedReportSurfaceWaterQuality_2013/MapServer 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.

This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov. The MD_Surface_Waters Feature Dataset includes 7 feature classes that geospatially depict the surface water bodies of Maryland. These feature classes are being provided so that data from the 2012 Integrated Report of Surface Water Quality can be displayed in geographic form for users of all levels. These different feature classes represent the different assessment unit scales utilized on the 2012 IR - some of which overlap in space. In addition - provided in the attribute tables for the Impoundments - Rivers_Streams - and Tidal_Waters feature classes is the use class designation as specified in COMAR Section 26.08.02.08. More information about these feature classes is contained in the metadata for each feature class. Map Service Link: http://mdewin64.mde.state.md.us/arcgis/rest/services/ MDE_Water_Quality/MD_IntegratedReportSurfaceWaterQuality_2013/MapServer 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.

This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. This dataset provides the Tier II catchments delineated for the most downstream Tier II segment. This file also provides the assimilative capacity (AC) status for each watershed. In cases where there is no remaining AC in a nested catchment but the larger encompassing segment has remaining AC - the smaller nested catchment is split out and assigned its own identification. These nested catchments are also then attributed to show the lack of AC remaining. The intended use of the catchment dataset is to assist State - Local - and Federal officials and stakeholders in determining the antidegradation status of current or planned activities which fall under the purview of the antidegradation policy and implementation procedure (COMAR 26.08.02.04-1). Using GIS - the stakeholder can assess if any activity - proposed or operational - such as a discharge - is located on land which drains (has run off) directly into and can potentially adversely affect a Tier II stream segment. This type of determination would be useful for permitting purposes - screening for sensitive or high quality resources - and various land use planning activities such as those undertaken by local officials during the Water Resources Element process - Water and Sewer Planning - or the Comprehensive Planning process. Feature Service Layer Link: http://geodata.md.gov/imap/rest/services/Hydrology/MD_WaterQuality/FeatureServer/1 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.

This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov. The MD_Surface_Waters Feature Dataset includes 7 feature classes that geospatially depict the surface water bodies of Maryland. These feature classes are being provided so that data from the 2012 Integrated Report of Surface Water Quality can be displayed in geographic form for users of all levels. These different feature classes represent the different assessment unit scales utilized on the 2012 IR - some of which overlap in space. In addition - provided in the attribute tables for the Impoundments - Rivers_Streams - and Tidal_Waters feature classes is the use class designation as specified in COMAR Section 26.08.02.08. More information about these feature classes is contained in the metadata for each feature class. Map Service Link: http://mdewin64.mde.state.md.us/arcgis/rest/services/ MDE_Water_Quality/MD_IntegratedReportSurfaceWaterQuality_2013/MapServer 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.

This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. AHPS Shapefile - Observations - a shapefile of river and lake observeration locations in Maryland. Feature Service Layer Link: http://geodata.md.gov/imap/rest/services/Hydrology/MD_Gauges/FeatureServer/1 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.

This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. A subset of watersheds created for the Blue Infrastructure Project (BI) based on the DNR 12 digit watershes as follows; 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. Last Updated: 5/1/2010 Feature Service Layer Link: http://geodata.md.gov/imap/rest/services/Hydrology/MD_BlueInfrastructure/FeatureServer/1 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.