The District was established as the Middle River Snake River Watershed District in 1970 with approximately 1,020 square miles in Marshall, Polk and Pennington Counties. The District was located in the Red River of the North basin. It was established in response to repeated flooding and to inadequate drainage in the area. Since 1973, the District has acquired jurisdiction of 25 drainage systems with nearly 350 miles of ditches.
In 2002 the Board of Water & Soil Resources (BWSR) approved a petition to add the Tamarac Watershed to the District. The number of Managers was increased from 5 to 7. The name was changed from the Middle River Snake River to the Middle-Snake-Tamarac Rivers Watershed District and it increased in size to approximately 1,476 square miles. It is located in the Red River of the North basin in Marshall, Polk, Pennington, Kittson, and Roseau counties.
The District constructed its first floodwater damage reduction impoundment, to temporarily store floodwater, in 1981. In 2000 its second impoundment was constructed. A PL-566 project to construct a Snake River diversion ditch around the town of Warren and another impoundment were finalized in 2006. Then in 2010 the largest impoundment was constructed. Finally, in 2013 our newest impoundment became operational. All of the impound locations have been towards the eastern 1/3 of the District.