assessment unit boundaries

I am trying to figure out a way to create markers as seen from the attached image where an angled line (in dark red) is created between the lines to represent a connecting stream. With the data I am using, each break is actually an assessment unit and all assessment units form a segment (stream). Does anyone know how these are created? I would assume an "end of line" symbol" but not sure where to look for that.

I am using ArcMap 10.6 and have access to most all tools.

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    Are you lines in a single feature class? Does each category (1502_03, 1501_01, etc) have a single feature or multiple features associated with it? What type of coordinate systems does your data use? May 30 '19 at 18:11

One way would be to create a separate point layer and add points at each desired location where you would like the marker. With that, you could utilize the layer's character marker to customize a marker to your preference.

Point Layer Character Marker

From here, add a new field to the point layer and record the line segment's endpoint angle.

Line Segment Angle

With the angles stored in the point layer's attributes, go into the point layer's symbology properties, select advanced, rotation and set the option to the angle field you created.

Point Layer Rotation

You may need to add negatives depending on the selected settings and/or angle but the result should something like this.

Line Segment Endpoint Marker

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