Kiln No. 1 is still loaded with limestone. It has been loaded since roughly 1855, when someone walked away from it and never came back. The charge was never fired, the stone never reduced to the calcium oxide that was the entire point of the enterprise. It sits there still, a 170-year-old to-do list item that no one will ever complete. The three Olema Lime Kilns, tucked against a hillside on the east bank of Olema Creek about five miles south of the hamlet of Olema, represent one of the more quietly poignant failures of the California Gold Rush - an industrial venture that lasted barely five years and produced almost nothing, yet left behind structures durable enough to outlast the ambitions that built them.
In 1850, two San Francisco entrepreneurs named James A. Shorb and William F. Mercer leased land from Rafael Garcia, a Mexican grantee who held title to the Olema Valley under the old Alta California land grants. California had been ceded to the United States just two years earlier, and San Francisco was exploding. Gold Rush wealth was pouring into the city, and every new building needed mortar, plaster, and whitewash - all of which required lime. Shorb and Mercer saw opportunity in the limestone deposits along Olema Creek and built three kilns to exploit them. The technology was straightforward: pack limestone into a barrel-shaped vault, fire it for days at temperatures exceeding 1,600 degrees Fahrenheit, and the calcium carbonate would decompose into quicklime. Sell it to builders in San Francisco. The plan was sound enough. The limestone was not.
The kilns were built into the hillside facing west toward the creek, each one a barrel-shaped stone vault enclosed in a rectangular outer casing of cut limestone. Kiln No. 1, the southernmost, was lined with fireclay and firebrick along the back half - the firebrick suggesting that its builders understood the rear wall would face the highest temperatures. Kiln No. 2, immediately to the north, was larger: an oval barrel nine feet across and nearly ten feet deep, lined entirely with fireclay applied like plaster, its mortar made from lime that Kiln No. 1 presumably produced. Its arched entrance, six feet wide at the base and tapering to two and a half feet at the barrel mouth, remains the best-preserved feature of the complex. Kiln No. 3, the northernmost, matched Kiln No. 2 in size. Together they formed a modest industrial installation - three stone ovens pressed against a Marin County hillside, a hundred yards from the highway that would one day become California State Route 1.
The kilns were reportedly fired only a few times. The limestone deposits turned out to be small and of poor quality - insufficient to sustain a commercial operation. By 1855, the financial depression of that year removed whatever remaining incentive Shorb and Mercer might have had to continue. They abandoned the kilns, leaving Kiln No. 1 loaded and unfired. The enterprise had lasted roughly five years and failed at the most fundamental level: the raw material was inadequate. It was not a failure of engineering or ambition but of geology. The limestone along Olema Creek simply could not support the industry that Shorb and Mercer had envisioned. Other lime operations in California fared better - the kilns at Santa Cruz and the operations in the Santa Lucia Mountains became significant producers - but the Olema venture joined the long list of Gold Rush enterprises that burned brightly and briefly before the economics caught up.
Nature moved in quickly. A Douglas fir sprouted in the rubble between Kilns No. 1 and No. 2 sometime after 1870, according to tree-ring dating, and grew large enough to severely damage both structures. Another Douglas fir took root in the pit of Kiln No. 3. Human visitors did their own damage: at some point before 1940, the entire arched entrance of Kiln No. 3 was dismantled and rebuilt as a barbecue pit in the town of Bolinas, twelve miles south. Other stones were carried off for rock gardens, fireplaces, and walls. Moss crept over what remained. The kilns became ruins in the truest sense - structures returning to the landscape that supplied them, their cut limestone slowly indistinguishable from the bedrock it came from.
The kilns now sit within Point Reyes National Seashore, listed on the National Register of Historic Places and documented by the Historic American Buildings Survey. Their significance lies precisely in their brevity. California is littered with the remnants of Gold Rush industries - stamp mills, smelters, hydraulic mining works, sawmills - but most of those had long productive lives that obscured their origins. The Olema Lime Kilns froze at the moment of abandonment, their unfired charge still in place, their construction techniques unaltered by decades of repair and modification. They are a snapshot of 1850s industrial ambition, preserved by the very failure that made them irrelevant. Drive Highway 1 through the Olema Valley and you pass within a hundred yards of them. The creek still runs. The Douglas firs still grow from the rubble. And Kiln No. 1 waits, patiently, for a fire that will never come.
Located at 37.99°N, 122.75°W on the east side of Olema Creek in the Olema Valley, within Point Reyes National Seashore. The kilns sit roughly 100 yards west of California Highway 1, about five miles south of the hamlet of Olema. From the air, look for the narrow Olema Valley running northwest-southeast between Bolinas Ridge to the east and Inverness Ridge to the west. The kilns are not individually visible from altitude but the valley corridor and Highway 1 are clear landmarks. Best viewed below 2,000 feet. Nearest airports: Gnoss Field (KDVO) in Novato approximately 18 nm east; San Francisco International (KSFO) approximately 30 nm south. Coastal fog common in summer mornings.