Lhéchalosem belongs to the Salishan family and sits closer to Halkomelem, spoken across the line in coastal British Columbia, than to anything spoken to the south - a reminder that the international border cut sideways through a world that had been organized around rivers and kinship instead. The Nooksack people are still here, headquartered near Deming about twelve miles south along the river that bears their name. Federal recognition came in 1973, three years after the tribe acquired a single acre of land, and the land base has since grown past three thousand acres of fee, trust and allotted parcels. The language nearly went with the generation that held it: by 2016 researchers could document only one remaining fluent elder. Revival work continues, which is a quieter kind of persistence than it sounds.

The city incorporated on 6 December 1912 and grew quickly, helped by a rail station that plugged it into the national network. Then it burned. A string of serious fires in the early twentieth century took out much of what had gone up, and the momentum never really returned. What followed was a long stretch of being the smaller neighbour. In 1992 the Postal Service moved the postmaster to Everson, and Nooksack found itself sharing ZIP code 98247 - a bureaucratic detail with teeth, since sales tax revenue apportioned by ZIP code began flowing to the wrong town. Nooksack eventually got 98276 of its own. When a citizens' group proposed in February 2009 that the two cities simply merge, with 'Nooksack Valley' floated as the name of the combined place, the council voted unanimously in May to drop it after hearing what residents thought.

Darius Kinsey came west from Missouri in 1890 and met Tabitha May Pritts in Nooksack; they married in 1896 and opened a studio at Sedro-Woolley the following year. What he made there became one of the great records of the Pacific Northwest: loggers standing on springboards driven into trunks wider than a room, whole crews arranged on the undercut face of a single cedar. His camera was an 11-by-14-inch Empire State view, carried with a custom tripod that could rise twelve feet. Tabitha ran the other half of the business, developing the negatives and printing images that went back out to the camps, where the loggers themselves bought them. In October 1940, Kinsey fell from a stump and stopped photographing. He spent his last five years putting his negatives in order, died in 1945, and is buried in Nooksack beside Tabitha. The valley also raised Louie Gong, the Nooksack artist who founded Eighth Generation in 2006 and built it by putting Coast Salish design onto shoes and blankets - and by arguing, loudly, that Native art should pay Native artists.

For a town that isn't on the Nooksack, the river still has the last word. On 15 November 2021 an atmospheric river parked over the border country and the Nooksack rose over its banks, flooding the valley communities and forcing hundreds of people out of their homes with the schools closed behind them. Sumas, a few miles north, lost an estimated 85 percent of its housing stock to flood damage. A freight train derailed near Sumas at the height of it; road access to Lummi Nation was cut entirely; the governor declared a state of emergency across fourteen western Washington counties. Then, on 28 November, more rain sent the river over again. The valley's soil is this productive precisely because the river has been depositing it here for thousands of years, which is the bargain: the same water that makes the berry fields makes the flood maps.

State Route 9 runs straight through, and most of what defines daily life here is shared with the neighbours - Nooksack, Everson and Sumas together support the Nooksack Valley School District, with one high school, one middle school and three elementaries between them. This is a young town by American standards, its median age hovering under thirty, with nearly half of households raising children. The population has climbed steadily, from 851 at the 2000 census to 1,338 in 2010 and 1,471 in 2020. Around it spread the dairy farms and raspberry fields of the Nooksack Valley, and on a clear day Mount Baker sits on the southeastern horizon, close enough to look like a local feature rather than a volcano.