b'GEM RUNSouthern stretch of Bonneville County above Gem State Dam ending near Bingham County border.Level:BeginnerLength:2miles Sunnyside RoadEnter: River left Upper Gem Lake Marina at 49th South Boat ramp 91Gravel parking lotPicnic tablesFloating docks 49th Beach SouthBathroom Enter Upper Exit:River right Lower15 S 35th West Gem Lake MarinaGem Lake Marina above Gem State65th SouthDam Boat rampGravel parking lotPicnic tables Exit Lower Gem Floating docks Lake MarinaBathroomHazards: Midriver islands Gem State81st SouthMidriver HighwayDam26 bridge concrete pillars one mile below entry pointMidriver Highway 26 bridge low clearance for boats but clearance for paddlersMidriver Gem State Dam below exit pointHighlights: Lava rock banks on both sides of channel above exit point'