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Historic Properties (Points, Lines). These include State Antiquities Landmarks (SAL), National Historic Landmarks (NHL), National Register of Historic Places Listed and National Register of Historic Places Eligible (NRHP) properties, Recorded Texas Historic Landmarks (RTHL), Texas Centennial Markers, and Contributing properties as well as locally designated resources if available. These features are compiled from various TxDOT and consultant surveys & reports. These determinations are made by the National Park Service or the State Historic Preservation Officer (SHPO).
Historic Districts (Polygons). These include State Antiquities Landmarks (SAL), National Historic Landmarks (NHL), National Register of Historic Places Listed and National Register of Historic Places Eligible (NRHP) properties. Whenever possible, contributing properties and locally designated historic features have also been included. All of these features and their designations are gathered and determined by the National Park Service, the Texas Historical Commission, or through various surveys and reports performed by TxDOT and their consultants.
Historic Bridges (Points). These are bridges listed or eligible to be listed on the National Register of Historic Places (NRHP). A bridge that is rare in type, unusual from an engineering perspective, or historically significant because of its location or association with an important event or person may be deemed a historic bridge. This determination is made by the TxDOT Environmental Affairs Division (ENV) in consultation with the State Historic Preservation Officer (SHPO). Texas has numerous examples of historic bridges, including metal truss bridges, concrete arch or span bridges, and suspension bridges.
Historic Resource Survey Reports (Polygons). HRSRs are mapped for each project's Area of Potential Effect (APE). The APEs are determined by industry standards and/or survey requirements. These map elements are updated approximately once a month to reflect any changes.
Bypassed Relocated Bridges (Points). Bridges that have been bypassed or relocated for one reason or another. Many now serve only as pedestrian crossings or exhibits at various local museums. Some bridges were relocated by TxDOT, some by county entities, and still others were handled privately. TxDOT project information is included if available.
Update Frequency: Monthly
Source: TxDOT Environmental Affairs Division Historic Properties Databases
Security Level: Public