For more than fifty years, a set of finished freeway ramps rose out of a marsh at the edge of Seattle's Washington Park Arboretum and ended in mid-air. They were not abandoned. They were never used. Built in 1963 alongside the SR 520 Evergreen Point floating bridge, the "ramps to nowhere" were designed to connect Lake Washington to the R.H. Thomson Expressway, a 15-mile freeway that was planned, funded by a 1960 bond vote, and then never built. This is the story of how Seattle poured the first few hundred feet of a highway that would never get a second few hundred feet.

In this infrastructure documentary we map the full plan behind the Thomson Expressway: the 1950s vision of a freeway grid denser than Los Angeles, the parallel expressways on either side of Interstate 5, the Bay Freeway through South Lake Union, and the north-south route along Empire Way (now Martin Luther King Jr. Way) through the Rainier Valley and the Central District. We trace exactly where the SR 520 ramps were supposed to lead, why state engineers built the interchange before the expressway had a design, and why that decision made sense in 1963.

Then we follow the first break. The route would have trenched the heart of Black Seattle, displaced as many as 8,000 people, demolished up to 3,000 homes, and taken a large piece of the Arboretum. The state began buying houses in Montlake years before construction and became the neighborhood's worst landlord. In 1968 Citizens Against R.H. Thomson and Citizens Against Freeways organized, thousands marched through the Arboretum in 1969, lawsuits followed, and on February 8, 1972, Seattle voters killed the Thomson Expressway and the Bay Freeway by a two-to-one margin in what became known as the Seattle Freeway Revolt.

But citizen activism is only half the explanation. The expressway was a city project with city bonds, not an Interstate with 90 percent federal funding, and its financing plan was never real. Opposition to the Thomson grew directly out of the earlier fight against SR 520 itself. And in the same years, Seattle also voted down the Forward Thrust rail system, choosing neither the freeway nor the train.

We close with what the cancellation did and did not undo: the Montlake homes already demolished, the I-90 corridor that was built but drastically downsized, the Link light rail line that now runs along the exact Thomson alignment through the Rainier Valley, the five decades the ramps spent as a graffiti-covered diving platform and local landmark, their demolition during the SR 520 bridge replacement (most removed in 2017, the last remnants in early 2024), and the single concrete bent preserved by Seattle ARCH as a monument to the freeway that never came.

If you are interested in abandoned highways, unfinished freeways, ghost ramps, Seattle history, urban planning failures, the American freeway revolts, floating bridges, or forgotten American infrastructure, this episode of THE UNFINISHED MAP is for you.

CHAPTERS
00:00 Ramps that end in mid-air
02:20 Where they are: Union Bay, Montlake, and the SR 520 bridge
06:10 The plan: Seattle's freeway grid and the R.H. Thomson Expressway
11:40 Why the ramps were built before the highway existed
13:30 The route through the Central District and Montlake
17:00 The Freeway Revolt: CARHT, the 1969 march, the 1972 vote
19:30 Why activism is only half the story
23:00 What the cancellation could not undo
26:00 Fifty years as a landmark, then demolition
29:00 The preserved bent and what it means

Research for this episode draws on HistoryLink, the Seattle Public Library's Freeway Revolt historical directory, the Arboretum Foundation, Seattle ARCH, the Capitol Hill Seattle Blog, KIRO 7, and MyNorthwest. All figures are taken from those sources; where estimates vary, we use the published range.

What piece of unfinished infrastructure in your city still points at something that never arrived? Tell us in the comments. Subscribe to THE UNFINISHED MAP for weekly documentaries on abandoned roads, forgotten railroads, sealed tunnels, and the maps that never got finished.

#SR520 #RampsToNowhere #Seattle #AbandonedHighway #UnfinishedFreeway #FreewayRevolt #ThomsonExpressway #Infrastructure #UrbanPlanning #SeattleHistory #TheUnfinishedMap




Sources:

End of the road for Seattle's 'ramps to nowhere' — KIRO 7
Last Remnants of the "Ramps to Nowhere" Removed — Arboretum Foundation
May 4, 1969: Hit the Highway, Freeway — Seattle Star
Seattle City Council approves Bay Freeway plans — HistoryLink
R.H. Thomson Expressway — AARoads Wiki
Seattle's Freeway Revolt: A Directory of Historical Resources — Seattle Public Library
50 years ago, the Seattle Freeway Revolt — Capitol Hill Seattle Blog
Montlake's Ramps to Nowhere are gone — Capitol Hill Seattle Blog
Ramps to Nowhere Historic Marker narrative — Berger Partnership / UW
Saving 520's ramps to nowhere — MyNorthwest