The Clearwater River flows through northern Minnesota, draining approximately 1,362 square miles across Beltrami, Clearwater, Mahnomen, Pennington, Polk, and Red Lake Counties before joining the Red Lake River at Red Lake Falls. This diverse watershed offers varied fishing opportunities throughout its length, from designated trout waters in the upper sections to warm-water fisheries in the lower reaches. The river's character changes dramatically along its course, flowing through riparian wetlands, agricultural lands, and forested areas. The upper sections in Beltrami County feature cooler waters suitable for trout, while downstream sections support populations of walleye, northern pike, bass, catfish, and panfish. Connected lakes within the watershed, including Clearwater Lake, Maple Lake, and Pine Lake, provide additional recreational fishing opportunities. The river's headwaters originate near the border between Clearwater and Beltrami Counties, where the gradient steepens as it transitions into trout habitat before flowing north toward Clearwater Lake and eventually westward through the remaining counties.