Polly's Canyon Arch is Rob Jones's name for this arch.
He also took the photograph . He says this arch is
26 miles down-canyon in Grand Gulch from the Kane Ranger
Station, then 1/4 mile up (east) Polly's Canyon. It can
be seen on a NE sandstone fin as the canyon sweeps to
the north. Alternately, one can hike about 1/4 mile
up-canyon from the foot of the Government Trail. Then
enter Polly's Canyon and follow the above directions.