Seattle Now & Then: The Jackson Street Regrade, 1908

(click to enlarge photos)

THEN: To accommodate fill dirt expected from the Jackson Street regrade, pre-existing structures like these hotels near the southeast corner of Sixth and Weller were lifted by their owners onto posts. After the regrade, the incline between Twelfth and Fifth avenues was reduced to less than 5% grade from the previous 15%. This photo was taken on May 20, 1908, halfway through the project. (Lewis & Wiley, courtesy Ron Edge)
NOW: Shoppers line a walkway between Fifth and Sixth avenues in the Chinatown-International District in early December 2020. Photo historian Ron Edge positions the “Then” hotels just inside the walls of today’s Uwajimaya Village at right. (Jean Sherrard)

(Published in the Seattle Times online on Jan. 7, 2021
and in PacificNW Magazine of the print Times on Jan. 10, 2021)

Sluicing away Jackson Street to unclog the city’s future arteries
By Jean Sherrard

Long before becoming a student of Seattle history, I had a recurring (and oddly unsettling) dream of hiking an unbroken ridge between First Hill and Beacon Hill. Were it not for Reginald Heber Thomson (1856-1949), our city’s current topography may have matched my dreamscape.

THEN 2: Reginald H. Thomson, Seattle city engineer, in 1905. (courtesy, Seattle Municipal Archives)

When Thomson first stepped onto Seattle docks on Sept. 25, 1881, he told a friend that the city was built in a hole and he meant to dig it out. The 25-year-old’s ambition might have been attributed to youthful exuberance, but in the decades to come, his words would prove prophetic. Appointed city engineer in 1892, Thomson began by installing water and sewage infrastructures (still in use today) before attacking Seattle’s hills and valleys.

Notes David Williams in his masterful 2015 history of Seattle topography “Too High and Too Steep,” to Thomson “a functioning city was like a human body.” He insisted that “enlarging and improving what he called the city’s arteries” was vital to Seattle’s future health.

A view from lost Denny Hill, looking north to Magnolia

Picturesque piles of glacial deposit — like Denny Hill north of downtown — were, in Thomson’s view “an offense to the public,” interrupting the free flow of traffic. In 1898, the hill’s decapitation commenced, using hydraulic hoses (called “giants”) to liquify and sluice away the moraine.

One of the “giants” in action (courtesy Ron Edge)

When Rainier Valley residents complained that the Jackson Street incline’s steep 15% grade obstructed access to Seattle’s business district, Thomson lent a sympathetic ear. Intrigued by their initial suggestion to tunnel through the hill, he eventually advanced a “far cheaper and far better” solution — utter removal. “Every house and every garden and every street” in the affected areas might be lost, but he judged the sacrifice necessary to make municipal headway.

Looking east from the corner of Weller and Maynard

In May 1907, the hydraulic giants began their work. Enormous pumps fed up to 25 million gallons of salt and fresh water daily to their pressurized hoses, expelling a thousand cubic yards of dirt during each eight-hour shift.

Another view looking west from Eighth and Weller

Completed in December 1909, the Jackson Street project covered the largest surface area of all Seattle regrades: 56 blocks in total, with 29 lowered and 27 raised. More than three million cubic yards of dirt were moved, lowering Ninth and Jackson by 85 feet and raising Sixth and Weller by about 30.

My recurring dream may harbor some whiff of lost geography, yet the force of R.H. Thomson’s vision resides. While often trading natural beauty for an engineer’s expedience, his straightened, flattened, stretched Seattle provided a blank canvas for cityscapes to come.


To see our Now & Then featured in spectacular 360 video, along with an audio narration by Jean, click here.

A few more regrade-themed spectacles below:

A western view of the regrade, with King Street station’s clock tower just right of center

One thought on “Seattle Now & Then: The Jackson Street Regrade, 1908”

  1. Jackson st. regrade largest single street grade in Seattle. Amazing picture looking up Jackson st from 5th ave in an earlier feature you had years ago on the Bus(c)h hotel which included holy names. Would be nice to see a pic of the grade from 5th to the flats it seemed pretty steep.
    Grade at 9th ave reduced from 15% to 8 I believe. That made Jackson from 5th to 12th almost as steep as Queen Anne?

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.