methods. Flumes were constructed to carry water to sluices, long toms and hydraulic mining operations that separated gold from river gravel; dams and waterwheels helped maintain the necessary head to drive these extensive waterworks and clear the riverbed so that gold bearing sands could be excavated. Some hard rock (tunnel) mining also occurred in the San Gabriels in later years, such as at the 1896 Big Horn Mine at Mount Baden-Powell, and the 1913 Allison Mine on Iron Mountain high above the East Fork, where several tunnels of up to in length remain. Settlements of considerable size were established in very rough country along the upper San Gabriel River. Prospect Bar, located up the narrow canyon of the East Fork, grew to include "a boarding house, two or three stores, blacksmith shop, butcher shop, etc." A flood in November 1859 destroyed the settlement, but four months later it was re-established as the town of Eldoradoville, near the junction of the East Fork and Cattle Canyon. The period from 1859 to 1862 was the most prosperous of the San Gabriel gold rush; Wells Fargo stages alone shipped some $15,000 ($ in dollars) worth of gold per month out of Los Angeles County, most of it from the San Gabriel diggings. John Robb, who ran a saloon in Eldoradoville, claimed he "made more money by running the sawdust from the floor of the Union Saloon through his sluice box than he was able to make from real mining, so prodigal and careless of their pokes were the miners and gamblers of those days." By 1861, Eldoradoville had an estimated population of 1,500. The town prospered until the Great Flood of 1862, the largest in California's recorded history, swept the canyon clean: Mining on the San Gabriel did continue after the flood of 1862, but never on the same scale as before. A second wave of gold seeking began in the early 1930s along the East Fork. A September 1932 Los Angeles Times article described it as a "leisurely gold rush" and reported: Several gold mining camps sprang up along the East Fork, the largest including the Upper and Lower Klondike. Mining during the 1930s focused on finding the finer particles and dust left behind from the previous gold boom. For many it was a source of income during the Great Depression, and for some others was a recreational activity. These mining camps