Wyoming Highway 318 (WYO 318) is a short east–west 1.09-mile-long (1.75 km) spur route off Wyoming Highway 270 in northeastern Platte County.

WYO 318 travels east as Hartville's Main Street for a mile till it reaches the old mining town of Sunrise at 1.09 miles.

[2][3] Upon reaching the former town, WYO 318 ends at a road closed sign as the mine property is gated.

The Sunrise Mine operated until 1980 and produced 42,457,187 tons of iron ore[4][5] The section of present-day Wyoming Highway 270 from US 26 at Guernsey north to Hartville at present-day Wyoming Highway 318 was formerly designated as Wyoming Highway 318 prior to the 1970s.

Highway 318 used to begin as US 26 at Guernsey and end at Sunrise with a 90 degree turn at Hartville.