Oregon Route 104 (OR 104) is an Oregon state highway which connects US 101 near Warrenton with Fort Stevens State Park. OR 104 is known as the Fort Stevens Highway No. 104 (see Oregon highways and routes). It is 6.03 miles (9.70 km) long and runs north–south, entirely within Clatsop County. The OR 104 designation was applied to the Fort Stevens Highway in 2002 as part of Oregon's project to assign route numbers to highways that did not have route numbers.