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West side road along the Snoqualmie Valley near Vincent, now West Snoqualmie Valley Road, looking north, n.d. Courtesy of King County Archives.

West side road along the Snoqualmie Valley near Vincent, now West Snoqualmie Valley Road, looking north, n.d. Courtesy of King County Archives.

In an effort to identify and preserve the county’s rich transportation history, this grant-funded project documented the story of over 100 years of road building in the region. It also identified nine significant "Heritage Corridors" in unincorporated King County, where travelers can still experience a sense of that history.

Corridors included in the report are Cedarhurst Road/Westside Highway, Dockton Road, Green Valley Road, Issaquah-Fall City Road, Old Cascade Scenic Highway, Old Sunset Highway, Osceola Loop, West Snoqualmie River Road, and West Snoqualmie Valley Road/Carnation Farm Road.

The King County Landmarks Commission designated eight of the corridors as Community Landmarks at a public hearing in June 2009. This honorary designation recognizes special places in the community and carries no associated land use regulations or restrictions. The ninth corridor, the Old Sunset Highway, is primarily managed by other public agencies and has not been proposed for county landmark designation at this time. The information resulting from the Corridors project will help the county maintain and operate its historic and scenic roads in keeping with their unique character. We also hope it will enhance the public’s travel experience and lead to a greater understanding and appreciation of our region’s transportation history.

Read about the corridors in the project's final report or watch a video. Enjoy your journey!

This project is a collaboration between the King County Road Services Division, King County Historic Preservation Programand 4Culture, the County's cultural services agency. Funding was provided through a Federal Transportation Enhancement Program grant administered by the Washington State Department of Transportation.

Heritage Corridors

Cedarhurst Road/Westside Highway

Cedarhurst Road/Westside Highway
Vashon Island

Location: Vashon Island
Length: 8.2 miles
Begins: Cedarhurst Road at Vashon Highway
Ends: Southwest 220th Street

Cedarhurst Road/Westside Highway Heritage Corridor offers the most varied farm, forest and marine vistas in the Heritage Corridor system. Dropping down from the island’s crest to the western shore, the route passes through deep cedar forest before breaking into a patchwork of open farmlands. Water views in the middle distance off to the west are framed by small orchards and stands of conifers. The road connects several rural crossroads settlements that present opportunities for interpretation.

Nearby:

Dockton Road

Dockton Road
Vashon-Maury Island

Location: Vashon-Maury Island
Length: 4.7 miles
Begins: Chautauqua Beach Road
Ends: 99th Avenue Southwest in Dockton

Dockton Road Heritage Corridor is the only maritime-themed road in the Heritage Corridor system. Winding past beaches, farms, and woods, it offers surprising, unobstructed views across water, as well as direct access to the shoreline. From an early date, Dockton Road linked the small communities of Ellisport, Portage and Dockton, each with a distinctive heritage.

Sights to see, things to do!

Green Valley Road

Green Valley Road
Auburn-Black Diamond

Location: Southeast King County
Length: 11.0 miles
Begins: State Route 18 and Southeast Auburn-Black Diamond Road
Ends: State Route 169

Green Valley Road Heritage Corridor is a classic farm-to-market road, and the longest single road in the Heritage Corridor system. It showcases traditional yet evolving agricultural land-uses, with many picturesque historic barns dotting the landscape. Along the route are occasional visitor-friendly seasonal farms and produce stands.

Highlights and resources:

Issaquah-Fall City Road

Issaquah-Fall City Road
Snoqualmie Valley

Location: Sammamish Plateau, Snoqualmie Valley
Length: 4.8 miles
Begins: Southeast Duthie Hill Road
Ends: 328th Avenue Southeast in Fall City

Issaquah-Fall City Road Heritage Corridor follows the route of the oldest wagon road into the Snoqualmie Valley, pre-dating the arrival of the railroad. This farm-to-market route linked Fall City to Issaquah from as early as 1883. The evocative central segment over the forested ridge retains some of the most intact roadway design elements of any in the Heritage Corridor system.

Nearby:

Osceola Loop

Osceola Loop
Enumclaw Plateau

Location: Southeast King County Enumclaw Plateau
Length: 7.2 miles
Begins: Southeast 448th Street, at 196th Avenue Southeast
Ends: Point of beginning

The Osceola Loop Heritage Corridor on historic Porter's Prairie includes the oldest road in the Heritage Corridor system. It also represents the best and least developed of scenic routes on the Enumclaw Plateau, with sweeping views across open dairy and horse farms toward Mt. Rainier in the distance. Two historic schools and a pickle factory mark the former agricultural crossroads of Osceola, established in 1877.

Resources:

West Snoqualmie River Road

West Snoqualmie River Road
Snoqualmie Valley

Location: Snoqualmie Valley
Length: 5.8 miles
Begins: Tolt Hill Road
Ends: State Route 202

The Snoqualmie River Road Heritage Corridor steps back to the early 20th century when farming was a way of life and the valley seemed miles from the city. Located in a secluded pocket of the valley with proximity to the meandering river, this corridor offers peaceful ambience, low traffic levels, and bucolic views. Several working specialty farms on old dairy acreage provide seasonal interest.

Nearby:

Old Cascade Scenic Highway

Old Cascade Scenic Highway
Stevens Pass

Location: Northeast King County
Length: 13.3 miles
Begins: Stevens Pass Ski Area
Ends: U.S. Highway 2 (Money Creek Bridge)

The Old Cascade Scenic Highway Heritage Corridor represents three remnant sections of the 1914-1925 cross-mountain highway over Stevens Pass. This corridor takes the traveler back in time to the sights, sounds, and smells of early 20th century travel in the forested Cascade Range. Historic resources relate to the history of the Great Northern Railroad, Stevens Pass Historic District, logging and mining, and include the picturesque railroad and mill town of Skykomish. Today this corridor is a part of the Stevens Pass Greenway, a National Scenic Byway.

Resources:

Old Sunset Highway

Old Sunset Highway
Snoqualmie Pass

Location: Snoqualmie Pass
Length: 12.8 miles
Begins: Alpental Access Road
Ends: Interstate 90

The Old Sunset Highway Heritage Corridor uniquely illustrates the evolution of road development in King County, re-tracing extant portions of the 1915 automobile route over Snoqualmie Pass. Partially under the jurisdiction of Mt. Baker-Snoqualmie National Forest, this corridor offers a taste of early 20th century motoring in a rugged mountain environment, and provides access to multiple recreational activities. Corridor lies within Mountain-to-Sound Greenway, a National Scenic Byway.

Resources:

West Snoqualmie Valley Road/Carnation Farm Road

West Snoqualmie Valley Road
Snoqualmie Valley

Location: Southeast King County
Length: 11.0 miles
Begins: State Route 18 and Southeast Auburn-Black Diamond Road
Ends: State Route 169

The Snoqualmie Valley Road Heritage Corridor presents the traveler with a 12-mile panorama of the Snoqualmie Valley. Stretched along the western hillside overlooking the valley floor, this road offers a glimpse at a century of agricultural land use. Pastoral views toward the Cascade Mountains, modern-day specialty farms on historic acreage, and the iconic Carnation Farms are all to be experienced along this corridor.

Nearby:

Red Brick Road Condition Assessment

Thanks to a 4Culture grant, Road Services was able to hire a consultant to evaluate the condition of the Red Brick Road, a historic landmark east of Redmond. The conditions assessment gives the division an overview of issues that should be addressed and provides recommendations for further study and action.

Red Brick Road Condition Assessment Report
Read the report