Description: Loudoun County was founded and surveyed in 1757. Loudoun's boundary with Maryland is the mean low water mark of the Potomac River on the Virginia side; it has not been surveyed. Loudoun's boundary with Prince William County is the Bull Run Creek. The border has not been modified for recent surveys. Individual plats along the Potomac and Bull Run Rivers have not resulted in a change in the border along those rivers- since measurements of the waters edge vary seasonally and the County Boundary needs to be seamless and constant. Many decades ago tax commissioners from surrounding jurisdictions assigned parcels to one jurisdiction or another rather than splitting parcels. Currently there is a mix of parcels split by a County Boundary, parcels taxed entirely in Loudoun, and portions of parcels within the County but taxed by another jurisdiction. The Assessor's office dictates how these parcels are taxed, as do other jusidictions. In 1957, the boundary with Fairfax County was re-established and finalized. The boundary with Fauquier County was surveyed and monumented in 1966. The boundary with Clarke County was surveyed in 1989, and the boundary survey with Jefferson County West Virginia was completed in 1998. The West Virginia, Fairfax, Fauquier, and Clarke boundary arcs were created by generating coverages from the monument coordinates using the generate command.
Description: This data layer contains all parcel boundaries for Loudoun County, VA. A parcel is a tract or plot of land surveyed and defined by legal ownership. Data were compiled from plats and deeds recorded at the Clerk of the Court and from historic tax maps. Source material was digitized or the coordinates were entered into the database via ARC/INFO Coordinate Geometry (COGO). Digital data from engineering companies has also been incorporated for newer subdivisions. A MCPI number is used to identify each parcel, which is a 9 digit unique parcel ID that is a combination of: MAP, CELL, and PARCEL. MAP: 3 digit map number (001-701) corresponding with map tile index. CELL: 2 digit map grid location of parcel center; the grid is comprised of 1000 by 1000 ft grid cells numbered as rows and columns (Columns numbered > 5 6 7 8 9 0; Rows numbered > 1 2 3 4). PARCEL: 4 digit location of polygon center based on the 1983 Virginia State Plane coordinate grid where an easting and northing measurement is taken. Horizontal Datum: NAD83 HARN, SPCS VA North, FIPS Zone 4501, US Survey Feet Vertical Datum (if applicable): NAVD88. The MAP, CELL, and PARCEL values of a parcel do not change when a parcel is altered by a boundary line adjustment or becomes residue from a subdivision. The MAP, CELL, and PARCEL values may therefore be inconsistent with the location of polygon center. MAP, CELL, and PARCEL values have been manually altered for some parcels to agree with other databases; as a result, not all parcels can be located by the MAP, CELL, and PARCEL values.
Description: The Commonwealth of Virginia grants certain powers to incorporated municipalities. There are seven towns in the County. Washington Dulles International Airport is also included due to its jurisdictional authority, but is not tracked by Loudoun's Management Information System (LMIS).
Description: This feature class identifies all of the fire hydrants in the town of Hamilton, VA. It also identifies the year, manufacturer & street location of each hydrant.
Description: This feature class identifies all of the fire hydrants in the town of Leesburg, VA. It also identifies the year, manufacturer, type, etc for each hydrant.
Description: This feature class identifies all of the fire hydrants in the town of Lovettsville, VA. It also identifies the manufacturer & street location of each hydrant.
Description: This feature class identifies all of the fire hydrants in the town of Round Hill, VA. It also identifies the year, manufacturer & street location of each hydrant.
Description: Point layer dataset showing location of Dry Hydrants and or Rural Water Supply locations. These features are either a buried tank or a pond or other natural water source.
Description: The stormwater pipes and culverts data is comprised of lines. The pipes and culverts are the man-made structures composed of concrete, metal and plastic used to convey stormwater from catch basins and ponds to the natural drainage ways and swales that eventually discharge to creeks and streams. The pipes and culverts data was collected primarily in eastern Loudoun in the more urbanized portions of the County and was collected in the field using GPS instrumentation. At least 95% of the locational data for the pipes and culverts is accurate to within 1 meter or less. Pipes and culverts are named and digitized in the direction of water flow.
Copyright Text: Loudoun County Department of General Services: Division of Public Works: Stormwater Management Program
Description: The stormwater structures data is comprised of points (inlets, manholes, pipe ends, culvert ends, and control devices). The pipe and culvert point structures, typically one at each end of the pipe/culvert line, include the stormwater infrastructure where there is a change in pipe direction. The data was collected primarily in eastern Loudoun in the more urbanized areas of the County. The data was collected in the field using GPS so that at least 95% of data is accurate to less than 3.28 ft. (1 m).
Copyright Text: Loudoun County Department of General Services: Division of Public Works: Stormwater Management Program
Description: The data set identifies the six county-administered Historic and Cultural Conservation District areas within Loudoun County. The County-designated districts include six Historic and Cultural Conservation Districts (Aldie, Bluemont, Goose Creek, Oatlands, Taylorstown, and Waterford) and one Historic Roadways District (Beaverdam Creek). The Historic Districts are Zoning Overlay Districts and are subject to Loudoun County Zoning Ordinance, Article VI, Section 6-1800, Designation of Historic Districts and Section 6-1900, Permits in Historic Districts. The Beaverdam Creek Historic Roadways District differs from the other districts, as the Roadways District only includes the part of the parcel located within a 35-foot buffer in each direction from the centerline of a designated roadway. The Planning Department administers the County's Historic Districts Program.
Description: The data set identifies the four towns-administered Historic Districts within Loudoun County. The Town-designated districts include the Historic Middleburg District, the Purcellville Historic Corridor Overlay District, and two districts in Leesburg - the Leesburg Old and Historic District and the Leesburg H-2 Corridor District. The Historic Middleburg District is subject to Town of Middelburg Zoning Ordinance, Article XVII. The Purcellville Historic Corridor Overlay District is subject to the Town of Purcellville Zoning Ordinance, Article 14A. The Leesburg Old and Historic District and the Leesburg H-2 Corridor District are subject to Town of Leesburg Zoning Ordinance, Article 7, Sections 7.5 and 7.6, respectively. Each Town-designated historic district is administered by their related Planning Departments.
Description: This layer identifies the Route 28 Highway Improvement District in Eastern Loudoun County. A special Commission appointed by both Loudoun and Fairfax County Board of Supervisors uses this District to provide improvements to Rt 28.
Description: The zoning layer constitutes the official zoning map for The Town of Leesburg as per Virginia State Code, 1950, revised, Section 15.2-2285 and is a component of the official zoning ordinance.
Description: DISCLAIMER: The Town of Purcellville does not guarantee the accuracy of information contained herein. The official zoning map is available at the Town of Purcellville Office of Planning and Zoning and all zoning information must be verified with the Town of Purcellville Purcellville Zoning constitutes the official zoning map for the Town of Purcellville, VA and is a component of the official zoning ordinance. It is owned and maintained by the Town of Purcellville.
Description: Forest tracts is a base map data layer derived by automated processes and processed for cartographic representation at 1:2400 scale. The polygon features represent the areas of forest or scrub cover as seen from above and are mapped to National Map Accuracy Standards (NMAS).
Description: The regulatory floodplain boundary reflects the limits of flooding resulting from a storm having an occurrence probability of 1%, identified as the 100 year storm. The floodplain boundary was recompiled from the listed sources onto the County's 1:2400 scale maps with five foot interval topography. This floodplain feature class contains polygon feature classes only.
Description: The Predictive Wetlands Model layer identifies areas that are predicted to be wetlands in Loudoun County. This is a weighted estimation of actual wetland presence based on wetland characteristics. This model predicts pre-development wetlands only and does not take into account changes either permitted by the U.S. Army Corps of Engineers (USACE) or the Virginia Department of Environmental Quality (DEQ). Post development wetlands will be evaluated in the future.
Description: Water Bodies, including surface elevation, are a base map data layer derived by automated processes and processed for cartographic representation at 1:2400 scale. The polygon features represent the ponds, reservoirs, stormwater impoundments, marshes, and major creeks and rivers found on the County's base map as seen from above and are mapped to National Map Accuracy Standards (NMAS).