From October 1992 to May 2006, Devils Lake rose approximately 26.6 ft. The lake has not reached its natural spill elevation to the Sheyenne River in recorded history. However, geological evidence indicates a spill occured sometime within the last 1,800 years. Flooding at Devils Lake has destroyed hundreds of homes and businesses and inundated thousands of acres of productive farmland. The State of North Dakota and the U.S. Government have spent over $450 million dollars in flood mitigation efforts including moving homes, roads, rail and power lines, and building dikes.