The Tamarac River flows through the northwestern corner of Minnesota, primarily within Marshall County, where it serves as a significant tributary to the Red River of the North. This relatively small river system originates in the glacial lake plain region and meanders westward through flat agricultural lands characteristic of the Red River Valley. The river's watershed encompasses approximately 281,000 acres across portions of Kittson, Marshall, and Roseau counties, though its main channel flows predominantly through Marshall County before joining the Red River.

The Tamarac exhibits the classic features of a prairie river, with a meandering course through predominantly agricultural terrain. Its flow is heavily influenced by seasonal snowmelt and summer rainfall, with water levels fluctuating considerably throughout the year. The river passes through the communities of Stephen and Florian, where county and municipal access points provide opportunities for public interaction with the waterway.

Spring and early summer offer the most reliable paddling conditions, typically from late April through June, when water levels are sufficient for navigation. During this period, paddlers can expect a gentle current suitable for novice to intermediate skill levels. The river's modest gradient and generally forgiving nature make it accessible to recreational paddlers, though low water conditions in mid to late summer can create challenges with shallow sections and occasional portages around beaver dams or log jams.

The Tamarac River corridor supports typical Red River Valley ecology, with riparian zones featuring cottonwood, willow, and box elder trees providing habitat for white-tailed deer, beaver, muskrat, and various waterfowl species. The river itself supports populations of northern pike, walleye, and various rough fish species, with fishing access available at several bridge crossings and designated access points.

Access points include the Stephen city park area and the Florian County Park, both offering boat launches or carry-in access. These locations provide parking and basic amenities for river users. The flat terrain surrounding the river means limited scenic variation, but the peaceful agricultural landscape offers solitude and wildlife viewing opportunities often absent from more heavily trafficked waterways.

Water quality concerns related to agricultural runoff have been documented, with the river listed as impaired for dissolved oxygen and turbidity. Paddlers should be aware that the Tamarac is a working agricultural river, with water clarity varying seasonally and following precipitation events. The river's management falls under the jurisdiction of the Two Rivers Watershed District, which monitors water quality and implements conservation practices throughout the watershed.