The route is the main street for the town and spans 4.19 miles (6.74 km).

In the south-central part of town, the road turns north onto Main Street and widens to four lanes at this point.

The highway passes Paradise Resort Golf Course before turning northwest and terminating at another diamond interchange at I-15, exit 167.

[2] State Route 99 was established in 1969 coinciding with the construction of I-15 in Millard County, providing a connection from two exits north and south of Fillmore.

[citation needed] The entire route is in Fillmore, Millard County.