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Locating Your Trail Bridge for Longevity

Long Description for Figure 17

Illustration showing a stream channel and the locations of survey locations.

Graphic showing typical site survey with labels that read: Shot, Ground Shot, Bottom of bank, Top of bank, TBM, Permanent control point, Shots that form equilateral triangles produce a more accurate contour map, Permanent control point, Permanent control point. This graphic also contains a section of notes which are:

  1. This example plan is for a typical site. More complex sites with flood plains will require additional shits and ground shots.

  2. More complex sites will require an additional 50 feet of trail CL beyond what is shown here.

  3. More complex steams will require 300 feet upstream and 300 feet downstream of survey from the proposed bridge location.

  4. Set three control points that are intervisible out of the project area and a temporary bench mark (TBM).

  5. Take bankfull indicator shots.