Question: The Lake Koocanusa Scenic Byway begins in what county?

Context paragraphs:
New Jersey Route 29: Route 29 is a state highway in the U.S. state of New Jersey.  It runs 34.76 mi from an interchange with Interstate 295 (I-295) in Hamilton Township in Mercer County, where it continues as I-195, to Route 12 (Bridge Street / Race Street) in Frenchtown, Hunterdon County.  Between the southern terminus and I-95, the route is a mix of freeway and four-lane divided highway that runs along the Delaware River through Trenton.  This section includes a truck-restricted tunnel that was built along the river near historic houses and Riverview Cemetery.  North of I-95, Route 29 turns into a scenic and mostly two-lane highway.  North of the South Trenton Tunnel, it is designated the Delaware River Scenic Byway, a New Jersey Scenic Byway and National Scenic Byway, that follows the Delaware River in mostly rural sections of Mercer County and Hunterdon County.  The obsolete Delaware & Raritan Canal usually stands between the river and the highway.  Most sections of this portion of Route 29 are completely shaded due to the tree canopy.  Route 29 also has a spur, Route 129, which connects Route 29 to U.S. Route 1 (US 1) in Trenton.

Lakes to Locks Passage: The Lakes to Locks Passage is a scenic byway in northeastern New York in the United States and in southern Quebec in Canada.  The byway unifies the interconnected waterway of the upper Hudson River, Champlain Canal, Lake George, and Lake Champlain; this waterway is the core of North America’s first "super-highway" between upstate New York and the Canadian province of Quebec.  The initiatives of the Lakes to Locks Passage aim to unify the byway corridor as a single destination.  The US portion of the passage is a New York State Scenic Byway, a National Scenic Byway, and an All-American Road.

River Road National Scenic Byway: The River Road National Scenic Byway (also called the River Road National Forest Scenic Byway) is a National Scenic Byway and National Forest Scenic Byway in the US state of Michigan.  This 23+1/2 mi byway follows M-65 and River Road; it extends eastward into the Huron National Forest and ends in the historic community of Oscoda near Lake Huron.  The road parallels the historic Au Sable River (French: "Rivière aux Sable" , "River of Sand") which has historically been a major transportation route for floating Michigan’s giant white pine from the forest to the saw mill towns on Lake Huron.  Along its course, the roadway offers access to several recreational areas as well as the local scenery.  The section of the River Road that follows M-65 was added to the State Trunkline Highway System in the 1930s.  The River Road was given National Forest Scenic Byway status in 1988, and National Scenic Byway status in 2005.

Lake Koocanusa Scenic Byway: The Lake Koocanusa Scenic Byway is a 67 mi scenic highway in Lincoln County, Montana, USA, following the Kootenai River and the eastern shore of Lake Koocanusa on Highway 37.  The road starts in Libby and proceeds north to Eureka.  Lake Koocanusa is formed behind Libby Dam and has a visitors center nearby.  The Kootenai River and Lake Koocanusa cut a narrow fjord-like gorge between the Purcell Mountains and the Salish Mountains.  The byway is a popular route for visitors visiting the Kootenai National Forest.  Snow removal crews work to keep the route open during the winter season.  Lodging and services are available in Libby and Eureka.

Ohio &amp; Erie Canalway Scenic Byway: The Ohio & Erie Canalway Scenic Byway is a 110-mile (177 km) scenic byway located within the Ohio & Erie Canalway National Heritage Area in Northeast Ohio.  The scenic byway begins in Cleveland and ends in New Philadelphia, with a spur connecting Massillon and Canton.  It follows the Ohio and Erie Canal through cities ranging from large, industrial cities such as Cleveland, Akron, Barberton, and Massillon to small, quaint villages such as Peninsula, Clinton, Navarre, Bolivar, and Zoar.

Black River National Forest Scenic Byway: The Black River National Forest Scenic Byway is a National Forest Scenic Byway that runs along the Black River in the Ottawa National Forest in the U.S. state of Michigan.  The byway follows County Road 513 (CR 513) through Gogebic County in the Upper Peninsula.  As a county road, it is maintained jointly by the Gogebic County Road Commission (GCRC) with assistance from the U.S. Forest Service (USFS).  The byway provides access to several waterfalls and other visitor attractions in the area.  The route of the byway first existed as a wagon road in the 1840s and as a county road in the 1920s.  The byway designation was instituted on June 20, 1992, and the byway was dedicated later that year.

Sierra Vista Scenic Byway: The Sierra Vista Scenic Byway is an 82.7 mi route through the Sierra National Forest in the U.S. state of California.  Many examples of the Sierra’s most distinctive granite domes, meadows and glacial valleys can be seen along the way.  The Sierra Vista Scenic Byway begins two miles (3 km) north of the foothill community of North Fork, climbing the western slope of the Sierra Nevada mountain range until its crest, and finally dropping back down into the foothills near Oakhurst.

Forest Heritage Scenic Byway: The Forest Heritage Scenic Byway is a 76.7 mi National Forest Scenic Byway, National Scenic Byway and North Carolina Scenic Byway that traverses through the Pisgah National Forest, in Western North Carolina.  It features the Cradle of Forestry, waterfalls, trails and scenic vistas.

Volcanic Legacy Scenic Byway: The Volcanic Legacy Scenic Byway is an All-American Road in the U.S. states of California and Oregon.  It is roughly 500 miles (800 km) long and travels through the Cascade Range past numerous volcanoes.  It is composed of two separate National Scenic Byways, the Volcanic Legacy Scenic Byway - Oregon and Volcanic Legacy Scenic Byway - California.  The latter also wholly includes the Lassen Scenic Byway.

Libby, Montana: Libby is a city in and the county seat of Lincoln County, Montana.  The population was 2,628 at the 2010 census.

Supporting paragraphs: Lake Koocanusa Scenic Byway Libby, Montana
Answer: Lincoln County