Historic resource feature layers that are used to provide location, historic status and other information about historic properties in Texas.  This includes data symbolized as Points, Lines, and Polygons.  Resources types include Buildings, Districts, Structures, Sites, and Objects. More detailed descriptions of each feature layer is listed below.
<span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><b><u>Historic Properties</u> </b><i>(<font color='#228b22'>Points</font><font color='#000000'>,</font><font color='#228b22'> Lines</font>)</i><b>.</b> 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 &amp; reports. These determinations are made by the National Park Service or the State Historic Preservation Officer (SHPO). </span><div><font face='Avenir Next W01, Avenir Next W00, Avenir Next, Avenir, Helvetica Neue, sans-serif'><span style='font-size:16px;'><br /></span></font><div><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><b><u>Historic Districts</u></b><i> (<font color='#228b22'>Polygons</font>)</i><b>.</b> 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.  </span><br /></div><div><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><br /></span></div><div><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><b><u>Historic Bridges</u> </b></span><i>(<font color='#228b22'>Points</font>)</i><b>.</b><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'> 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.  </span><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><br /></span></div><div><br /></div><div><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><b><u>Historic Resource Survey Reports</u> </b></span><i>(<font color='#228b22'>Polygons</font>)</i><b>.  </b><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'>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.  </span></div><div><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><br /></span></div><div><b><u>Bypassed Relocated Bridges</u> </b><i>(<font color='#228b22'>Points</font>)</i><b>. </b>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.<span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><br /></span></div><div><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif;'><font size='2'><i><br /></i></font></span></div><div><span style='font-size:small; font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif;'>Update Frequency: Monthly </span><br /></div><div><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif;'><font size='2'>Source: TxDOT Environmental Affairs Division Historic Properties Databases</font></span></div><div><font size='2'>Security Level: Public</font></div></div>
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