From a MILW advertisement
Public Domain: Published Prior to 1923
BH Photo #396159
The right of way is now owned by:
Climbing Arrow Ranch
2525 FAIRWAY DR
BOZEMAN, MT 59715-5862
I think one would honor their wishes and contact them before entering their land.
Of course you will have to wait three days for the nearest police officer to complete the drive to this bridge...
I received this message:
"Your website has incorrect information. The Eagle's Nest Trestle is located on PRIVATE PROPERTY, it is not open to public traffic. Please correct this as we do prosecute."