From Moab take Hwy. 191 north -
approx. 1 mi after the Colorado Bridge
turn left onto Road 279 (Potash-Road).
After about 4 mi along the Colorado,
the trailhead is on the right.
The trail starts with a short climb over the railroad tracks.
After 30 min you reach a steel ladder with rope.
Shortly after that both Arches are visible:
the Bowtie and the Corona!
GPS data:
Parking & Trailhead:  N38°34'29,2'' - W109°37'55,1''
 Bowtie Arch:  N38°34'50.4'' - W109°37'18.3''
Corona Arch:  N38°34'47.1'' - W109°37'12.2''