https://community.esri.com/t5/arcmap-questions/stream-elevation-to-existing-dem-ground/m-p/1023892#M1979 <P>Hello,</P><P>&nbsp;</P><P>I am trying to take a stream with elevation and project that elevation out till it hits existing ground (DEM) and generate a polyline or polygon to see the impact of raising or lowering the lake level.&nbsp; Using ArcMap 10.7, have 3D and Spatial Analyst.&nbsp; Tried "Intersect 3D Line with Surface" and it created the same line.&nbsp; Thanks for any help!</P> Fri, 05 Feb 2021 15:09:28 GMT SteveSch 2021-02-05T15:09:28Z https://community.esri.com/t5/arcmap-questions/stream-elevation-to-existing-dem-ground/m-p/1023892#M1979 <P>Hello,</P><P>&nbsp;</P><P>I am trying to take a stream with elevation and project that elevation out till it hits existing ground (DEM) and generate a polyline or polygon to see the impact of raising or lowering the lake level.&nbsp; Using ArcMap 10.7, have 3D and Spatial Analyst.&nbsp; Tried "Intersect 3D Line with Surface" and it created the same line.&nbsp; Thanks for any help!</P> Fri, 05 Feb 2021 15:09:28 GMT https://community.esri.com/t5/arcmap-questions/stream-elevation-to-existing-dem-ground/m-p/1023892#M1979 SteveSch 2021-02-05T15:09:28Z