It is estimated that fewer than 100 Kokanee salmon remain in Lake Sammamish. The recent return of beaver ("Castor canadensis") to Lake Sammamish worries City of Issaquah and Lake Sammamish State Park officials who state that the mammals will cause flooding and burrow under roadways. These officials are recommending relocation of the beaver families. On July 6, 2010, officials of the City of Issaquah have asked Washington Department of Fish and Wildlife to tear out a beaver dam on Tibbetts Creek in Lake Sammamish State Park because of concerns about potential flooding and barriers to salmon migration. In contrast, research on watersheds in the Northern United States and Canada shows that beavers provide ecological benefits by creating ponds that increase fish and bird abundance and diversity. Research in the Stillaguamish River basin, approximately north of Lake Sammamish, found that extensive loss of beaver ponds resulted in an 89% reduction in coho salmon smolt summer production and an almost equally detrimental 86% reduction in critical winter habitat carrying capacity. Lake Sammamish is bordered by Marymoor Park at the lake's north end, Lake Sammamish State Park at its south end, and the East Lake Sammamish Trail. Lake Sammamish State Park provides nine public boat launches that can be accessed through a separate park entrance, for a fee, with parking and restroom facilities on site. The public can access the lake's west shores at Redmond's Idylwood Park. The privately owned Vasa Park Resort, located in Bellevue, provides access from the west for a fee. Vasa Park offers one ramp for launching watercraft. Several housing developments own small, private parks that provide lake access for their residents. The main leisure activities include rowing, fishing, waterskiing, wakeboarding, wakesurfing, tubing, and jet skiing. There is a public slalom course for waterskiing at the far north end of the lake, running from the west to the east. In the mid-1980s, local radio personality Pat O'Day proposed that the Seafair Cup hydroplane races be moved to Lake Sammamish from Lake Washington, an effort that was unsuccessful. Lake Sammamish offers fishing enthusiasts a variety of species to pursue, including perch, smallmouth bass, largemouth bass, cutthroat trout, salmon, and steelhead trout, among others.