page_title: Washington State Route 21
section_title: Route description
hierarchical_section_title: Washington State Route 21 / Route description
caption_attribution_description: A photograph of a hill near Republic, WA. This is along the Sanpoil River.
context_page_description: State Route 21 is a 191.34-mile long state highway in the U.S. state of Washington that traverses four counties: Franklin, Adams, Lincoln and Ferry. The highway extends from an intersection with SR 260 in Kahlotus north through Lind, Odessa, Clark, Keller, Republic and Curlew before becoming Highway 41 at the Canada–US border in Danville. SR 21 is concurrent with U.S. Route 2 in Wilbur and SR 20 in Republic and has two diamond interchanges: at US 395 in Lind and Interstate 90 south of Odessa. Between Lincoln and Ferry counties, the roadway crosses Franklin D. Roosevelt Lake on the Keller Ferry, operated fare free by the Washington State Department of Transportation and the Department of Highways since 1930.
  Since 1899, at least one segment of the current highway has been in the state highway system. In 1899, the Marble Mount Road was established and later numbered State Road 4 in 1905 and renamed to the Sans Poil-Loomis Road in 1907. In 1915, a branch to the Canada–US border was added to the highway, but was removed in 1923.
context_section_description: SR 21 originates at an intersection with SR 260, about 0.28 miles (0.45 km) east of the northern terminus of SR 263; both intersections are in the city of Kahlotus, which is located in a narrow valley near several coulees in Franklin County. After leaving Kahlotus as the Lind–Kahlotus Road, the highway turns northeast and later west as it passes over the Sand Hills Coulee four times. Curving due north, the roadway leaves Franklin County to enter Adams County. Passing farmland in the flat landscape, SR 21 intersects SR 26 and continues through an unnamed coulee to intersect Smart Road. Smart Road was the former alignment of SR 21 prior to the U.S. Route 395 (US 395) interchange being built. SR 21 intersects US 395 in a diamond interchange east of Downtown Lind. From the interchange, the highway travels west and intersects Smart Road again before crossing over the Centennial Trail and entering Downtown Lind. In Downtown, the roadway is named Second, I and First Streets and serves as the main connector to other areas. After turning north to leave Lind, the road encounters the Palouse to Cascades State Park Trail and more plains before intersecting the pre-interstate alignment of Interstate 90 (I-90) and interchanging with I-90 at exit 206, another diamond interchange. North of the interchange, SR 21 travels through more plains and a coulee to leave Adams County and enter Lincoln County.
  In Lincoln County, the highway travels through farmland to encounter Odessa as Division Street, intersecting SR 28. The roadway turns northwest at Pacific Lake and reverts northwards into farmland. After temporarily turning east into more farmland, the road enters Wilbur, named Bruce Avenue. In Wilbur, SR 21 turns west, concurrent with US 2, for 0.65 miles (1.05 km) before branching off north to intersect SR 174 and leave Wilbur over rolling farmland. North of Wilbur, the roadway enters the top of Speigle Canyon and makes a winding descent before exiting at the floor of the canyon and nearing Franklin D. Roosevelt Lake; at 80,000 acres (323.75 km²), the lake is the largest in Washington. Paralleling the lake, the road then uses the Keller Ferry, a 80-foot (24.38 m) long boat used as a fare-free ferry across Franklin D. Roosevelt Lake, part of the Lake Roosevelt National Recreation Area, operated by the Washington State Department of Transportation (WSDOT) and its previous counterparts since 1930. 
  The ferry travels across the Lincoln County line to enter Ferry County, named after Elisha P. Ferry, the first Washington governor, southwest of Keller in the Colville Indian Reservation. Traveling northeast, between the Sanpoil River and the southern end of the Okanagan Highlands, SR 21 passes Keller and continues inland into the Columbia Mountains on the banks of the river. The river forms a canyon that the highway passes through and eventually both the river and road leave the Colville Indian Reservation. Shortly after leaving the reservation, the roadway enters Republic and becomes concurrent with SR 20 for 2.56 miles (4.12 km) before exiting the concurrency and Republic. Between Republic and the Canada–US border, an estimated daily average of 1,600 motorists used this segment of SR 21, making this section the busiest. The daily average has declined since 2006 and 2007, when a daily average of 1,700 motorists utilized the segment. Northeast of Republic, the highway passes Curlew Lake, the 123-acre (0.50 km²) Curlew Lake State Park and the communities of Malo and Curlew. After passing through more dense forests, the roadway enters Danville, where SR 21 crosses the Canada–US border into British Columbia as Highway 41 (BC 41). BC 41 continues 1.2 kilometres (0.7 mi) north to end at BC 3 southwest of Grand Forks, BC.
caption: A hill south of Republic on SR 21, which is parallel to the Sanpoil River between Keller and Republic.
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