bridge crossing the Camas Slough to Lady Island and enters downtown Camas after leaving the island. The highway serves as a four-lane freeway bypass of Camas and travels through two partial double roundabout interchanges with SR 500, which travels northwestward to Orchards, and 2nd Street in Washougal. SR 14 continues east past the Steigerwald Lake, Franz Lake, and Pierce national wildlife refuges, all located within Columbia River Gorge National Scenic Area in Clark and Skamania counties. The highway also passes the Bonneville Dam in North Bonneville and the Bridge of the Gods before reaching Stevenson, the county seat of Skamania County. SR 14 leaves Stevenson traveling eastwards through the community of Carson River Valley and a series of tunnels along the Columbia River before crossing over the White Salmon River into Klickitat County near Underwood. The highway intersects SR 141 Alternate and the Hood River Bridge, before reaching the cities of White Salmon and Bingen, where it passes the local Amtrak station and travels through a junction with SR 141. SR 14 continues east and crosses the Klickitat River into Lyle and forms the southern terminus of SR 142, which travels northeast towards Goldendale. The highway travels east to a junction with US 197 near Dallesport and to Wishram, passing its Amtrak station. SR 14 leaves the Columbia River Gorge National Scenic Area west of Maryhill, where the highway intersects its spur route and US 97, forming a short concurrency with the latter. SR 14 continues northeast along the Columbia Hills and the Columbia River into Benton County, reaching a junction with SR 221 in Paterson. The highway ends at a diamond interchange with I-82 and US 395 northeast of Plymouth, located north of the Umatilla Bridge. Every year, the Washington State Department of Transportation (WSDOT) conducts a series of surveys on its highways in the state to measure traffic volume. This is expressed in terms of average annual daily traffic (AADT), which is a measure of traffic volume for any average day of the year. In 2012, WSDOT calculated that the busiest section of SR 14 was east of its interchange with I-205 in Vancouver, serving 72,000 vehicles, while the least busiest section of the highway was in Maryhill, serving 500 vehicles. SR 14 between Vancouver and Maryhill is designated as part of the National Highway System for its whole length, classifying it as important to the national economy,