Write-up

Somerset County Recreation & Trails
Line Name   surface  routes  total miles  gap  off_road  on_road  closed  unknown  other   
map Confluence east  trail Open Limestone  somerset,gap,GAP,  2.9298    2.9298            
map FortHill west  trail Open Limestone  somerset,gap,GAP,  4.0712    4.0712            
map Milepost 42 to Forthill  trail Open Limestone  somerset,gap,GAP,  2.0909    2.0909            
map Fort Hill to Markleton to milepost 52  trail Open Limestone  somerset,gap,GAP,  2.255    2.2550            
map Casselman to Markleton  trail Open Limestone  somerset,gap,GAP,  1.6585    1.6585            
map Rockwood Parking to Casselman  trail Open Limestone  somerset,gap,GAP,  4.4118    4.4118            
map Rockwood Rd to Parking  trail Open Limestone  somerset,gap,GAP,  0.0429    0.0429            
map Markleton north towards Garrett  trail Open Limestone  somerset,gap,GAP,  3.5599    3.5599            
map Garett west to Markleton  trail Open Limestone  somerset,gap,GAP,  3.2753    3.2753            
map Garrett ro milepost 37  trail Open Limestone  somerset,gap,GAP,  0.4089    0.4089            
map Garrett  trail Open Limestone  somerset,gap,GAP,  0.0261    0.0261            
map Garret to Salibury Viaduct  trail Open Limestone  somerset,gap,GAP,  2.6937    2.6937            
map Salsvery Viaduct  Trail Open Asphalt  somerset,gap,GAP,  0.3623    0.3623            
map Salsvery Viaduct to Jonnt Popper Rd  trail Open Limestone  somerset,gap,GAP,  0.6208    0.6208            
map Jonny Popper Rd to Milepost 32  trail Open Limestone  somerset,gap,GAP,  1.0029    1.0029            
map Meyersdale Viaduct to Meyersdale  trail Open Limestone  somerset,gap,GAP,  2.0275    2.0275            
map Meyersdale Viaduct  trail Open Limestone  somerset,gap,GAP,  0.0547    0.0547            
map Warrens Mill Rd to Meyersdale Viaduct  trail Open Limestone  somerset,gap,GAP,  3.3101    3.3101            
map Warren Mill Rd to Deal  trail Open Limestone  somerset,gap,GAP,  1.8554    1.8554            
map Deal to Savage Continetal Divide  trail Open Limestone  somerset,gap,GAP,  0.9656    0.9656            
map Continental Divide to Savage Tunnel North end  trail Open Limestone  somerset,gap,GAP,  1.1974    1.1974            
map Savage Tunnel  Trail Open Asphalt  somerset,gap,GAP,  0.6475    0.6475            
map Savage Tunnel to View  trail Open Limestone  somerset,gap,GAP,  0.1466    0.1466            
map Savage Tunnel View to Mason Dixon Line  trail Open Limestone  somerset,gap,GAP,  1.1011    1.1011            
           
Somerset County Recreation & Trails  total for Trail    40.7159    40.7159            
           

Trail Lines are typically entered by tracing satellite imagery to extract latitude/longitude coordinates. The accuracy of these coordinates changes depending on the source of the photo and the precision of placement. I have seem satellite edges mismatched on the order 55 feet. Line work is sometimes extracted from the Open Street Map Project and from Strava heat maps.
>Milepost Known milepost (are placed on the map when they are visible in the satellite image or can be located via to visible features in the image. Other miles posts are extrapolated using calculations along the rail line. Note Railroads have also been known to realign trackage and not move existing mileage markers, only making an annotation on their paper maps.
Distances Above are based on the google map distance between two points along the line work.