Petroleum County Sunrise / SunsetUnited StatesMTPetroleum CountySunset7:50 pmWinnettSunset at 7:50 pmSunset7:51 pmWild Horse LakeSunset at 7:51 pmFlatwillowLittle Bear LakePetrolia LakeTeigenWar Horse LakeWar Horse National Wildlife RefugeWild Horse LakeWinnettYellow Water Reservoir