Washington State Route 501

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State Route 501 marker

State Route 501
Erwin O. Rieger Memorial Highway
290x172px
The existing highway is highlighted in red. The proposed completion is shown in dashed purple.
Route information
Auxiliary route of I‑5
Defined by RCW 47.17.640
Maintained by WSDOT
Length: 13.97 mi[2] (22.48 km)
Existed: 1964[1] – present
Southern section
Length: 11.00 mi[2] (17.70 km)
South end: I‑5 in Vancouver
North end: Ridgefield NWR near Vancouver
Northern section
Length: 2.97 mi[2] (4.78 km)
West end: Main Street in Ridgefield
East end: I‑5 in Ridgefield
Location
Counties: Clark
Highway system
← SR 500 SR 502 →

State Route 501 (SR 501, designated as the Erwin O. Rieger Memorial Highway) is a 13.97-mile-long (22.48 km) state highway in the southern part of the U.S. state of Washington. It is split into two sections in Clark County, a north–south alignment connecting Interstate 5 (I-5) in Vancouver to the Port of Vancouver and the Ridgefield National Wildlife Refuge, and a west–east alignment connecting Ridgefield to I-5. Prior to the 1964 highway renumbering, SR 501 was designated as Secondary State Highway 1T (SSH 1T), established in 1937 and re-aligned to serve the Port of Vancouver in 1963.

Route description

Southern section

File:WA-501 at I-5, Vancouver.jpg
The southern terminus of SR 501 at an interchange with I-5 in Downtown Vancouver

The 11.00-mile-long (17.70 km) southern section of SR 501 and the Erwin O. Rieger Memorial Highway begins as the four-lane Mill Plain Boulevard at a diamond interchange with I-5 in Downtown Vancouver.[2][3] The highway travels west through Downtown Vancouver and splits into a one-way pair on 14th Street and 15th Street before rejoining as Mill Plain Boulevard.[4][5] SR 501 crosses a BNSF rail yard and enters the Port of Vancouver, becoming the Lower River Road and narrowing to a two-lane highway on the south side of Vancouver Lake.[6][7][8] The highway follows the Columbia and Lake rivers north past the Shillapoo Wildlife Recreation Area,[9][10] ending south of Post Office Lake in the Ridgefield National Wildlife Refuge.[11][12]

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 2011, WSDOT calculated that the busiest section of SR 501 overall was west of I-5 at C Street, serving 13,000 vehicles, while the least busiest section of SR 501 overall was south of Shillapoo Wildlife Recreation Area, serving 650 vehicles.[13] Between I-5 and the Port of Vancouver, SR 501 is designated as part of WSDOT's Highway of Statewide Significance,[14] which include interstate highways and other principal arterials that are needed to connect major communities in the state of Washington.[15]

Northern section

Looking east at the intersections of Main Avenue and Pioneer Street (SR 501) in Downtown Ridgefield

The 2.97-mile-long (4.78 km) northern section of SR 501 within Ridgefield begins as Pioneer Street at an intersection with Main Street at the Ridgefield City Hall.[2][16] The highway travels east through Downtown Ridgefield, passing View Ridge Middle School, before crossing over Gee Creek.[17][18] SR 501 continues east through two roundabouts, at 45th Street Avenue and 56th Place, before ending at a diamond interchange with I-5.[19][20]

Every year, WSDOT conducts a series of surveys on its highways in the state to measure traffic volume. This is expressed in terms of AADT, which is a measure of traffic volume for any average day of the year. In 2011, WSDOT calculated that the busiest section of the northern section was the I-5 interchange, serving 11,000 vehicles, while the least busiest section was the intersection with Main Street in Downtown Ridgefield, serving 3,200 vehicles.[13]

History

SSH 1T was created in 1937 during the formation of the primary and secondary state highways,[21] traveling on a 18.86-mile-long (30.35 km) route north from Primary State Highway 1 (PSH 1) and U.S. Route 99 (US 99) in Vancouver through Felida and Ridgefield to PSH 1 and US 99 at Pioneer.[22][23] The highway was re-aligned in 1963 to serve the Port of Vancouver, traveling along the Columbia River to Ridgefield west of Vancouver Lake onto a roadway that was to be constructed.[24] SSH 1T became SR 501 during the 1964 highway renumbering and codified as such in 1970,[25][26] being designated as the Erwin O. Rieger Memorial Highway in 1991.[27] As of 2012, the highway between the Ridgefield National Wildlife Refuge and the city of Ridgefield has not been constructed and remains as a physical gap in the state highway system.[28] The interchange between I-5 and SR 501 east of Ridgefield was rebuilt by WSDOT between 2010 and 2012, adding roundabouts at intersections west and east of the interchange as well.[29]

Major intersections

The entire highway is in Clark County.

Location mi[2] km Destinations Notes
Vancouver 0.00–
0.05		 0.00–
0.080		 I‑5 – Portland, Seattle Interchange
​ 11.00 17.70 Ridgefield National Wildlife Refuge
Gap in route
Ridgefield 11.00 17.70 Main Street
13.88–
13.97		 22.34–
22.48		 I‑5 – Portland, Seattle Interchange
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References

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External links

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