In 1829, a strange boat appeared on the Mississippi River. It was built from two steamboat hulls bolted side by side, joined at the bow and stern to form one wide, rigid platform. Across the front, between the two hulls, hung a massive iron beam. Behind it sat a steam engine geared not to a paddle wheel for speed, but to a winch, a lifting arm, and a set of chains.
It carried no passengers, no cotton. It was not built to be fast or beautiful. It was built to hunt trees. The enemy was a snag.
When a large tree on the bank was undercut by the current and toppled in, the heavy root ball sank and dug into the riverbed, while the trunk pointed downstream and slightly upward, held just beneath the surface by the force of the water. The result was a spear of waterlogged oak or cottonwood aimed directly at the hull of anything coming down the river. A snag jammed solid was called a planter. One that bobbed up and down with the current was called a sawyer, and the sawyer was the most feared, because it appeared and vanished without warning.
When it struck, it went through a steamboat hull like a knife into a drum. Steamboat hulls were thin, built light to ride high on a shallow river. A loaded boat could be on the bottom within minutes of striking a snag. Sometimes there was time to run her ashore and save the people.
Very often there was not. The numbers were devastating. Snags caused close to three-fifths of all steamboat accidents on the western rivers up to 1849. In Arkansas alone, of 190 documented steamboat wrecks, 96 were caused by snags, more than fire, boiler explosions, running aground, and collisions combined.
The average working life of a Mississippi steamboat was only four to five years. The boats were not wearing out. They were being killed by trees no one could see. This mattered to the whole country.
In the 1820s and 1830s, before the spread of railroads, the western rivers were the main highway. Cotton from the deep south, corn from the Ohio Valley, everything from the middle of the continent moved on steamboats. That road was killing its own traffic at a ruinous rate. In the first half of the 1800s, steamboat disasters killed roughly four thousand people.
The snag was the quiet, constant killer underneath the dramatic explosions that filled the newspapers. For years, no one knew what to do. You could not see the snags. You could not drain the river.
Telling captains to be careful did not help against a danger that was invisible until it was already through the hull. Then one man looked at the problem sideways and decided the answer was to treat the trees as an enemy to attack rather than an obstacle to avoid. His name was Henry Miller Shreve. He was born in 1785 and had spent his life on these rivers as a boat captain and trader.
He knew exactly where the snags were and what they did. On December 1, 1826, the government gave him the title Superintendent of Western River Improvements, making him responsible for fixing the rivers. Shreve had been turning over an idea since around 1821. Instead of steering around the trees, what if a machine went out and pulled them up out of the riverbed for good?
He designed a machine that did not exist. A single steamboat hull was too narrow and unstable to wrestle a sixty-ton tree up out of the riverbed. So Shreve took two hulls, each about 125 feet long, and bolted them together so the boat would not roll no matter what hung off its front. Across the gap between the bows, he mounted a heavy iron beam.
The boat would line up on a snag and drive full steam straight at it. The iron beam caught the tree, and the momentum of the entire double-hulled boat behind it either snapped the tree off below the waterline or wrenched the root ball loose from the mud. Then the steam engine, geared to a lifting rig of windlass, chains, and a lever arm, dragged the loosened tree up off the riverbed and lifted it into the gap between the hulls, where the crew waited with saws. The good wood was burned in the boiler as fuel.
The rest was dumped on the bank or sunk in a deep hole where it could never drift back into the channel. The machine was completed in August 1829 and named the Heliopolis. A job that took a work crew with ropes and hand tools the better part of a day could now be done in under forty-five minutes. A congressional report described a single snag pulled up that held 1,600 cubic feet of timber and weighed no less than sixty tons.
One account credits the boat with raising a tree 160 feet long in its first year. The men who watched these boats work gave them a nickname that stuck for the rest of the century: Uncle Sam’s tooth pullers. The government’s strange twin boat would clamp onto a rotten tree deep in the riverbed and haul it, roots and all, straight up out of the mud. The proof came quickly, at the worst place on the river.
Plum Point, a sharp bend on the Mississippi where the current dumped snag after snag into a dense underwater thicket, was called by some the most dangerous place on the whole river. Shreve took the Heliopolis there in 1829. He wrote afterward in his own report that in eleven hours, that whole forest of formidable snags was effectually removed. A place that had been swallowing boats for a generation was cleared in a single day.
By 1830, one year of these boats working the Mississippi, navigation had improved so much that only a single flatboat was lost to a snag on stretches that used to take boats regularly. The drowned forests had been pulled out of the riverbed within a couple of years. Shreve also understood that the river would just make more snags, because the current was constantly undercutting the banks. Through the 1830s, his crews went along the banks of the Mississippi and the Ohio, cutting back the big trees that leaned out over the water before they could fall in and become next year’s killers.
Then Shreve took on something of a different scale entirely. On the Red River, which runs through what is now Louisiana, there was a natural log jam called the Great Raft. It was a solid mass of fallen timber that choked the river for somewhere between 130 and 150 miles, and the oldest sections had been forming since around the year 1000. It was so dense that soil had built up on top of it, and plants and full-grown trees grew on its surface.
In places, you could stand on the river and not know there was water beneath you. It had backed up the water and flooded the surrounding land into a chain of lakes that still exist today. That flooded land had been home and livelihood to the Caddo people for a very long time. The flooding left rich open ground where they farmed, and the lakes and raft were part of a way of life they depended on.
When the raft was removed and the water dropped, that world changed. The river was opened for cotton boats, steamboats, and new towns, while the people who had lived with the old river were pushed aside. Both of those things are true at once. In 1832, Secretary of War Lewis Cass ordered Shreve to destroy the raft.
In 1833, Shreve took two snagboats, two supply boats, and 160 workmen up the Red River. They rammed, cut, and hauled section by section, mile by mile. It was brutal, feverish, dangerous work in a hot, snake-ridden, disease-ridden valley. By the summer of the first year, they had cleared more than sixty miles.
By May 1, 1838, after years of grinding forward, fighting funding shortages and the wood trying to jam back in behind them, navigation through the entire length of the Great Raft was finally considered safe. It had cost around $300,000 and taken nearly six years. At the foot of the raft, where his crews based their operation, a settlement grew up. In 1836, businessmen formed a company to build a town there and named it after the man who had opened the river: Shreveport.
To this day, a city of roughly 180,000 people is named after a boat captain, not for winning a battle or writing a law, but for pulling a 150-mile log jam out of a river with machines he invented himself. But the river was not done. As soon as government money dried up and maintenance stopped, trees kept falling in and the current kept pushing them together. Within a year of Shreve finishing, a new raft had begun to form.
Over the next thirty years, through the Civil War, the Great Raft quietly grew back. In 1872, Congress put up $170,000 to finish the job for good. The work fell to a young army engineer named Lieutenant Eugene Woodruff, who started in January 1873. Shreve’s old methods were not enough this time.
Woodruff brought in explosives. When blasting powder and ordinary dynamite proved too weak against the packed old timber, he turned to nitroglycerin, and it worked. On November 27, 1873, the final entanglement was pulled out, and the Red River ran open along its whole length for the first time in recorded history. A week later, a boat brought cotton down the newly opened river to Shreveport, the first cargo ever to make that run.
Woodruff did not live to see it. A yellow fever epidemic swept through Shreveport that year. He caught it and died on September 30, 1873, two months before the raft was finally gone. His brother came to finish the work he left.
When we talk about who cleared the rivers, we mostly talk about Shreve, and he earned it. But there was a second man who finished the fight and paid the highest price. The work never really ended, because the rivers never really stop. As long as trees grow on riverbanks, trees will fall in.
The snagboat became a permanent institution. The Army Corps of Engineers kept building and running snagboats for well over a century after the Heliopolis. One of them, the Montgomery, a steam-powered sternwheeler built in 1925, worked on seven different southern rivers from 1926 until 1982, pulling snags and clearing debris the same essential way Shreve’s boats did, just with newer machinery. She was made a national historic landmark in 1989 and now sits at Pickensville, Alabama, as a museum.
She is one of only two steam-powered sternwheel snagboats left in the entire country. The grand age of the Mississippi steamboat, with its paddle wheels and cotton trade, was only possible because an ugly, twin-hulled boat had gone down the river ahead of it and pulled the killers out of the water one at a time. The snagboat is not in the paintings or the songs. Almost nobody has heard of Henry Shreve unless they live in the city named after him.
Even fewer have heard of Eugene Woodruff. But the reason the rivers ran, the reason trade moved, is that somebody decided the smart move was to stop steering carefully around the trees and go out and pull every last one of them up out of the river. Somewhere ahead of every beautiful steamboat in every old painting, out of the frame, there was a squat, strange double machine grinding along, hauling a sixty-ton tree up out of the dark water so that the boat behind it could pass. That was the deal America made with its rivers.
Somebody had to pull the drowned forest out first, and they did, thousands upon thousands of trees, until the most dangerous road in the country was finally clear.