Question: The Emory River flows for just over 46 mi from its source near which state park in Morgan County, Tennessee, in the southeastern United States?

Context paragraphs:
Big River (Missouri): The Big River is a tributary of the Meramec River in east-central Missouri.  The river rises in western Iron County ( ), near the summit of Johnson Mountain and the locale of Enough; it flows through Washington County, Saint Francois County, and Jefferson County.  It forms part of the boundary between Jefferson County and Saint Francois County and also part of the boundary between Jefferson County and Washington County.  It empties into the Meramec River opposite Eureka ( ), where the Meramec forms the border between Jefferson County and Saint Louis County.  The river flows through Washington State Park, St. Francois State Park, and the Lead Belt mining district.  The elevation of the river at its source is approximately 1300 ft above sea level and at its mouth about 400 ft .  The length of the river is approximately 145 mi , while the airline distance between source and mouth is about 56 mi .  Its watershed area is 955 sqmi .

Frozen Head State Park: Frozen Head State Park and Natural Area is a state park in Morgan County, Tennessee, in the southeastern United States.  The park, situated in the Crab Orchard Mountains between the city of Wartburg and the community of Petros, contains some of the highest mountains in Tennessee west of the Blue Ridge.

Oakdale, Tennessee: Oakdale is a town located along the Emory River in Morgan County, Tennessee, United States.  The population was 212 at the 2010 census, a decrease from the 2000 census figure of 244.

Emory River: The Emory River is a river draining a portion of Tennessee's Cumberland Plateau.  It flows for just over 46 mi from its source near Frozen Head State Park to its mouth along the Clinch River at Kingston, Tennessee.

Little Tennessee River: The Little Tennessee River is a 135 mi tributary of the Tennessee River that flows through the Blue Ridge Mountains of Georgia, North Carolina, and Tennessee, in the southeastern United States.  It drains portions of three national forests— Chattahoochee, Nantahala, and Cherokee— and provides the southwestern boundary of the Great Smoky Mountains National Park.  The river flows through five major impoundments: Fontana Dam, Cheoah Dam, Calderwood Dam, Chilhowee Dam, and Tellico Dam, and one smaller impoundment, Porters Bend Dam.

Little Emory River: The Little Emory River rises in Morgan County, Tennessee near the town of Coalfield.  It is one of the major tributaries to the Emory River.  It crosses into Roane County, where it soon becomes an embayment of Watts Bar Lake several miles upstream of its mouth into the Emory.  (Watts Bar Lake is a relatively deep reservoir and causes "slack water" conditions many miles up several Tennessee River tributaries, not just the main stream.)

Withlacoochee River (Suwannee River): The Withlacoochee River originates in Georgia, northwest of Nashville, Georgia.  It flows south through Berrien County where it joins the New River and forms part of the boundary between Berrien and Cook counties.  It then flows south into Lowndes County, Georgia.  At Troupville, Georgia the Little River joins the Withlacoochee River flows continues to flow south and forms part of the boundary between Lowndes and Brooks counties in Georgia.  The river then flows into Florida for 1.34 miles Florida before returning into Georgia for an additional 2.44 miles.  It then returns to Florida, forming the northeast boundary of Madison County, Florida and the western boundary of Hamilton County, Florida and eventually merges with the Suwannee at Suwannee River State Park west of Live Oak.  The river is 115 mi long.  It is believed to be the source for the name of the central Florida river of the same name.

Kingston Fossil Plant coal fly ash slurry spill: The TVA Kingston Fossil Plant coal fly ash slurry spill occurred just before 1 a.m. on Monday December 22, 2008, when an ash dike ruptured at an 84 acre solid waste containment area at the Tennessee Valley Authority's Kingston Fossil Plant in Roane County, Tennessee.  1.1 e9USgal of coal fly ash slurry was released.  The coal-fired power plant, located across the Clinch River from the city of Kingston, uses ponds to dewater the fly ash, a byproduct of coal combustion, which is then stored in wet form in dredge cells.  The slurry (a mixture of fly ash and water) traveled across the Emory River and its Swan Pond embayment, on to the opposite shore, covering up to 300 acre of the surrounding land, damaging homes and flowing up and down stream in nearby waterways such as the Emory River and Clinch River (tributaries of the Tennessee River).  It was the largest fly ash release in United States history.

North Fork Crooked River: The North Fork Crooked River is a tributary, 46 mi long, of the Crooked River in the U.S. state of Oregon.  Beginning in the Ochoco National Forest and the Ochoco Mountains east of Prineville, it flows north, then east, then south-southwest to meet the larger stream between Post and Paulina.  The confluence is 111 mi upstream of where the Crooked River flows into the Deschutes River.

Sunrise River: The Sunrise River is a 39.1 mi tributary of the St. Croix River in east–central Minnesota in the United States.  It is formed at the city of Forest Lake in Washington County at the outlet of Forest Lake.  The river flows north, accepting the South Branch from the west near the city of Wyoming, and continues north into Mud Lake, where the West Branch, which rises in southeast Isanti County and briefly enters Anoka County, joins it near the city of Stacy.  From Stacy it flows generally north-northwest through Chisago County to meet the St. Croix River within Wild River State Park near the communities of Sunrise and Almelund.  Not far upstream from its mouth, the Sunrise collects its North Branch, which rises in Isanti County and flows through the city of North Branch.

Supporting paragraphs: Emory River Frozen Head State Park
Answer: Frozen Head State Park