The San Pitch River, extending 65 miles (105 km), is the primary watercourse of the Sanpete Valley and drains into the Sevier River in southwestern Sanpete.

The upper San Pitch River begins north of Milburn near Oak Creek Ridge[3] on the northern Wasatch Plateau and flows south to Moroni.

The middle San Pitch River runs from Moroni, where it crosses Utah State Route 132 (SR‑132).

The middle San Pitch River runs from SR‑132 to Gunnison Reservoir.

The lower San Pitch River flows from Gunnison Reservoir to where it meets the Sevier River, west of Gunnison.