It then heads southeast between Grampian Hill and Squaw Peak into Squaw Gulch, where it turns northeast over Frisco Summit and east through the ghost town of Frisco.

SR-21 leaves Milford heading southeast across an agricultural area to Minersville.

It continues through Adamsville, then turns east around Little Bald Hill through Greenville into Beaver.

In Beaver, it crosses I-15 without an interchange, the continues to end at an intersection with Business Loop I-15 (SR-160).

[5] Media related to Utah State Route 21 at Wikimedia Commons