Question: The Lee Metcalf National Wildlife Refuge lies along a river that is how many miles long?
Context: Three Arch Rocks National Wildlife Refuge is a U.S. National Wildlife Refuge off the northern Oregon Coast.  It is located on the central coast of Tillamook County, in the northwestern part of Oregon.  It is one of six National Wildlife Refuges within the Oregon Coast National Wildlife Refuge Complex and was the first National Wildlife Refuge west of the Mississippi River.  In 1970 the Refuge was designated as wilderness.  It is one of the smallest wilderness areas in the United States. The Occoquan Bay National Wildlife Refuge is a National Wildlife Refuge located where the Occoquan River meets the Potomac River in Woodbridge, Virginia, United States.  The 644 acre site, about half of which is wetlands, was a popular tourist spot known as Dawson Beach until the 1940s, after which it was used for military research by the U.S. Army's Harry Diamond Laboratories from the 1960s to the 1990s.  When the land was purchased from the military, it was temporarily called the Marumsco National Wildlife Refuge.  The refuge was formally established and renamed in 1998, and is now managed by the United States Fish and Wildlife Service as part of the Potomac River National Wildlife Refuge Complex. The Desert National Wildlife Refuge is a protected wildlife refuge, administered by the U.S. Fish and Wildlife Service, located north of Las Vegas, Nevada, in northwestern Clark and southwestern Lincoln counties, with much of its land area lying within the southeastern section of the Nevada Test and Training Range.  The Desert NWR, created on May 20, 1936, is the largest wildlife refuge in the lower 48 states of the United States, encompassing 1.615 e6acre of the Mojave Desert in the southern part of Nevada.  This Range is part of the larger Desert National Wildlife Refuge Complex, which includes the Ash Meadows National Wildlife Refuge, the Moapa Valley National Wildlife Refuge, and the Pahranagat National Wildlife Refuge. The Pahranagat National Wildlife Refuge is a protected wildlife refuge, located at the southern end of the Pahranagat Valley and administered by the U.S. Fish and Wildlife Service.  It is situated 90 mi north of Las Vegas, Nevada in Lincoln County, Nevada.  The 5380 acre refuge was created on August 16, 1963 and is part of the larger Desert National Wildlife Refuge Complex, which also includes the Ash Meadows National Wildlife Refuge, the Desert National Wildlife Refuge, and the Moapa Valley National Wildlife Refuge. Audubon National Wildlife Refuge is a 14739 acre National Wildlife Refuge in the U.S. state of North Dakota.  The refuge is managed by the U.S. Fish and Wildlife Service and is the centerpiece of the Audubon National Wildlife Refuge Complex, which includes numerous other refuges in the region.  Originally designated as the Snake Creek National Wildlife Refuge in 1955, the refuge was renamed in 1967 in honor of the artist and naturalist John James Audubon.  Most of the refuge area is a lake known as Audubon Lake which is managed by the U.S. Army Corps of Engineers. The Bitterroot River is a northward flowing 84 mi river running through the Bitterroot Valley, from the confluence of its West and East forks near Conner in southern Ravalli County to its confluence with the Clark Fork River near Missoula in Missoula County, in western Montana.  The Clark Fork River is tributary to the Columbia River and ultimately, the Pacific Ocean.  The Bitterroot River is a Blue Ribbon trout fishery with a healthy population of native westslope cutthroat trout and bull trout.  It is the third most fly fished river in Montana behind the Madison and Big Horn Rivers. Nantucket National Wildlife Refuge is a 24 acre range and was established in 1973 for its "particular value in carrying out the national migratory bird management program."  The refuge, which is cooperatively managed with The Trustees of Reservations, encompasses 24 acre at Great Point.  Nantucket National Wildlife Refuge is an un-staffed unit of the Eastern Massachusetts National Wildlife Refuge Complex.  Nantucket National Wildlife Refuge consists of the Northeast tip of Nantucket, known as Great Point.  The Refuge has been managed informally by TTOR several decades.  TTOR owns the land immediately adjacent to Great Point, known as the Coskata-Coatue Wildlife Refuge.  Great Point is known as one of the best surfcasting locations in New England because of the rip tide which brings bluefish and striped bass to the point.  The Refuge is also a destination for hundreds of visitors each year seeking to enjoy a Nantucket beach or a tour of the Great Point Lighthouse.  More information about the adjacent TTOR property is available on their website. The Yukon Flats National Wildlife Refuge is a protected wetland area in the U.S. state of Alaska.  It encompasses most of the Yukon Flats, a vast wetland area centered on the confluence of the Yukon River, Porcupine River, and Chandalar River.  The area is a major waterfowl breeding ground, and after a proposal to flood the Yukon Flats via a dam on the Yukon River was turned down, the Yukon Flats were deemed worthy of protection.  The Alaska National Interest Lands Conservation Act established the refuge in 1980.  It is the third-largest National Wildlife Refuge in the United States, although it is less than one-half the size of either of the two largest, the Arctic National Wildlife Refuge, or the Yukon Delta National Wildlife Refuge.  The refuge is administered from offices in Fairbanks. Medicine Lake National Wildlife Refuge is a 31533 acre National Wildlife Refuge located in the northeastern region of the U.S. state of Montana.  The refuge is part of the Medicine Lake National Wildlife Refuge Complex which also includes the Northeast Montana Wetland Management District (WMD) and Lamesteer National Wildlife Refuge.  Medicine Lake is from the Assiniboine description of the lake, "Bda wauka" (medicine water).  The refuge was established in 1935 to protect habitat for various wildlife and especially migratory birds.  The refuge is managed by the U.S. Fish and Wildlife Service, an agency of the U.S. Department of the Interior. Lee Metcalf National Wildlife Refuge is a 2800 acre National Wildlife Refuge (NWR) along the Bitterroot River in southwestern Montana, U.S. Established in 1964 as Ravalli NWR, it was renamed in 1978 in honor of the late Senator Lee Metcalf, a native of Montana.  The refuge was set aside for the protection of migratory bird species.  About 235 species of birds have been documented on the refuge, with over 100 nesting there.  Additionally, 37 species of mammals, and 17 species of reptiles and amphibians also have been documented.
Answer: 84