The Flume: How Boulder Creek Floated Its Lumber to Felton

Town & History
Written By Adrienne Gaughan

Before the railroad, Boulder Creek's problem was not cutting redwood. It was getting redwood out.

The valley had more standing timber than almost anywhere in California and a road down to Felton that a loaded wagon could ruin itself on. The answer, for about a decade, was to float the lumber out on water, down a wooden trough built along the river.

What it was

A V-flume: two planks meeting at an angle to make a trough, carried on trestles, fed by creek water, running downhill the whole way. Rough-cut boards went in at the top and came out at Felton, where the railroad took them to Santa Cruz and the coastal schooners.

The flume company incorporated in August 1874 (Robinson, p. 13), and the flume opened in October 1875 from a headworks just over two miles north of Boulder Creek to Felton. Its length remains disputed. Lisa Robinson's The San Lorenzo Valley Flume gives nine miles and locates the headworks with an 1875 diary (p. 15), while the Santa Cruz Weekly Sentinel reported a surveyed length of about fourteen miles. An earlier version of this article dismissed fourteen miles as a local legend; that was wrong. The two figures may measure the river's bends and the valley distance differently, but the record does not establish that explanation.

The company's name is unsettled. Rail historian Derek Whaley's history of the flume company renders it both as the San Lorenzo Valley Flume & Lumber Company and the Flume & Transportation Company. W. S. Rodgers, recalling it for the Santa Cruz Sentinel in May 1940, called it the San Lorenzo Transport and Flume Company of San Jose, and credited it with being the thing that first opened Boulder Creek to the outside world, improving the road as well as building the trough. We report the variance rather than picking a winner.

It ran earlier than the standard story says

The Santa Cruz Weekly Sentinel records work before the usual 1875 opening date.

In September 1873, a branch flume or feeder was reported as planned for extension up Boulder Creek, Bear Creek and the central fork. That is two years ahead of the accepted date, and it suggests either an earlier start or a longer construction period than the tidy version allows.

In June 1876, the paper reported the flume "working like a charm," with about twenty-five men employed on it. The same issue described the road from Felton to Boulder Creek in good condition and being sprinkled for dust. The road and flume worked alongside each other.

The best day it ever had

The single most useful number for understanding what this thing did comes from the Sentinel of June 25, 1881:

Friday of last week, inside of nine hours, 116,400 feet of lumber were run through the Felton flume. This is the most work ever done in any one day by the flume, and its capacity has probably more than doubled during the last six months.

More than 116,000 board feet, in under nine hours, on water. That is roughly a board foot every quarter of a second, all day, coming out of a mountain valley with no railroad in it.

The same page reports a steam sawmill being finished for Peery four miles above Boulder Creek, sitting right alongside the flume, and Chase & Co's sawmill on Boulder Creek starting up. The flume was not a curiosity. It was the spine that the mills arranged themselves along.

Why it failed anyway

Whaley's company history records the problems, and they showed up almost immediately. The forty-inch trough could not keep up with what the valley was cutting. It leaked. Its water supply ran dangerously low every summer, in a place where the dry season is long and reliable. A severe winter storm in early 1876 damaged it badly. An 1881 item notes simply that "the Boulder Creek flume is headless," and a feeder had been carried away by a storm in February 1878.

Rodgers, seventy years later, gave the shortest verdict: the flume was not a success, for lack of swift running water.

In 1879 the South Pacific Coast Railroad bought the flume company. In June 1883 it incorporated the Felton & Pescadero Railroad to replace the trough with rails.

The day it was cut in half

The end is precisely dated to Thursday, May 14, 1885 (Robinson, p. 55), and it is one of the better small scenes in the valley's record. From the Sentinel of May 16, 1885:

The last shipment of lumber was sent down the flume from Boulder Creek Thursday. The flume has been cut in twain to allow the railroad to cross. Hundreds of thousands of feet of lumber, shakes, etc., have been sent down the flume since it was built, about ten years ago.

Cut in two, so the thing replacing it could get past. The railroad reached Boulder Creek in April 1885, and crews tore out the flume along the new route as they went.

The stretch north of town outlived that demolition. With no rails yet beyond Boulder Creek, the upper-valley mills kept floating lumber down to the freight yard, and the Brimblecom family's account journals record the family's last flume shipments in early February 1888 (Robinson, The San Lorenzo Valley Flume, p. 57). The record does not establish the flume-wide last use. The Dougherty Extension Railroad gave the mills another route to market. Robinson dates its construction to 1887; Whaley describes surveys in late 1887 and construction reaching the mills in early 1888. Robinson also records smaller producers continuing to use the flume after the railroad was built, so the extension does not give us a final date for flume use.

The lower route lasted about ten years; northern shipments continued after 1885.

What is left

Not much. A flume is trestles and planks in a river canyon, and the San Lorenzo has flooded repeatedly since 1885. There is no maintained public flume trail.

The newspaper supplied the clearest ending in May 1885: the last lower-valley shipment went down, and the flume was cut in two so the railroad could cross. The upper stretch carried lumber for several more years.

Frequently Asked Questions

What was the San Lorenzo Valley flume?

A V-shaped wooden trough, carried on trestles and fed by creek water, that floated rough-cut lumber from the upper San Lorenzo Valley down to the railroad at Felton. Its length is contested: sources put it at anywhere from nine to fourteen miles. It opened around October 1875.

How much lumber could the flume carry?

On its record day in June 1881 it moved 116,400 board feet in under nine hours, which the Santa Cruz Sentinel called the most work ever done by the flume in a single day.

Why did they stop using the flume?

It leaked, it could not keep up with the valley's output, and its water supply ran low every summer. The South Pacific Coast Railroad bought the flume company in 1879 and replaced the trough with a rail line, which reached Boulder Creek in April 1885.

When was the flume torn out?

The lower route's last reported shipment from Boulder Creek went down in May 1885, when crews cut the flume in two for the railroad and removed it along the rail route. The northern stretch remained active later; the final system-wide use is not established.

Can I see any of the flume today?

No public remains are known, and there is no flume trail. Photographs and artifacts are best sought at the San Lorenzo Valley Museum.

Sources

Links checked 16 August 2026.

Adrienne Gaughan
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