Tunnel 32 is the famous Needle's Eye Tunnel located above treeline roughly 1 mile from the pass on the east side of the divide. Tunnel 33 is located on the west side of the divide several miles from the pass. It was known as the Riflesight Notch Tunnel.Where is the Needles Eye Tunnel?
Situated among pointed geological formations that resemble needles and spires, Needles Eye Tunnel is the main attraction along Needles Highway within Custer State Park. Look for this 10 m (35 ft) tall granite formation with a slit in it, created through centuries of erosion of soft sediment by wind, rain, thawing, and freezing.Where is the Needles Highway in South Dakota?
The Needles Highway is part of the South Dakota 87 toll road that is located inside Custer State Park in the Black Hills of South Dakota.Is Needles Highway open?
Due the snow, the Needles Highway is closed in winter. It is typically open for driving from ealy April through mid-October, but it can be closed anytime when the access is not cleared of snow. To reach this highway, from Custer, South Dakota, take US-16 Alt 8 miles east to SD-87.