Flaming Gorge Dam was built by the Bureau of Reclamation as part of the Colorado River Storage project.The dam is a concrete thin arch structure with a maximum height of 502 feet and a crest length of 1,285 feet. The Flaming Gorge Dam Visitor Center, which features information on the construction of the dam, is open April through October with limited hours the rest of the year. Free guided tours of the dam and power plant are conducted year-round by the Intermountain Natural History Association. The tours take between 45 minutes to 1 hour to complete. Winter tours are offered Friday through Monday every hour from 10 a.m. to 3 p.m. Summer tours take place every day from 9 a.m. to 4 p.m. Visitors are required to pass through metal detectors, and large bags are not allowed in the visitor center or on the tours. The parking lot and rest rooms close in the evening. Underwater diving is no longer permitted in the area of the dam and visitor center. Diving is allowed away from the dam and outside of the buoy lines above and below the dam. Flaming Gorge Dam and Reservoir are part of the Colorado River Storage Project.