Washington State Route 4
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| Ocean Beach Highway | ||||
SR 4 is highlighted in red.
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| Route information | ||||
| Defined by RCW 47.17.015 | ||||
| Maintained by WSDOT | ||||
| Length: | 62.27 mi (100.21 km) | |||
| Existed: | 1968 – present | |||
| Tourist routes: |
Lewis and Clark Trail Scenic Byway | |||
| Major junctions | ||||
| West end: |
 US 101 in Johnston's Landing
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 SR 401 in Naselle SR 409 in Cathlamet SR 411 in Longview
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| East end: |
 I‑5 in Kelso
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| Location | ||||
| Counties: | Pacific, Wahkiakum, Cowlitz | |||
| Highway system | ||||
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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, officially known as the 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.
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