Washington State Route 4

State Route 4
Ocean Beach Highway
SR 4 highlighted in red
Route information
Maintained by WSDOT
Length	62.27 mi[1] (100.21 km)
Existed	1968[2]–present
Tourist routes	Lewis and Clark Trail
Major junctions
West end	US 101 in Johnston's Landing
Major intersections	SR 401 in Naselle SR 409 in Cathlamet SR 411 in Longview
East end	I-5 in Kelso
Location
Country	United States
State	Washington
Counties	Pacific, Wahkiakum, Cowlitz
Highway system
State highways in Washington Interstate US State Scenic Pre-1964 1964 renumbering Former
← SR 3 → I-5

State Route 4 (SR 4) is a 62.27-mile-long (100.21 km) state highway, serving the southwestern region of the U.S. state of Washington. The highway, also known as Ocean Beach Highway, travels east along the Columbia River from U.S. Route 101 (US 101) at Johnston's Landing through Pacific, Wahkiakum and Cowlitz counties to an interchange with Interstate 5 (I-5) in Kelso. SR 4 is designated as part of the Lewis and Clark Trail Scenic Byway, a state scenic byway, as well as part of the National Highway System.

The highway, along with I-5 and SR 14, forms the former route of US 830, which ran along the Columbia River from Johnston's Landing to Maryhill from the creation of the United States Numbered Highways in 1926 until 1968. US 830 was co-signed with Primary State Highway 12 (PSH 12) from Johnston's Landing to Kelso and was created in 1937 as the successor to various unsigned state highways.