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A grain elevator is an agrarian facility complex designed to stockpile or store grain. In grain trade, the term "grain elevator" also describes a tower containing a bucket elevator or a pneumatic conveyor, which scoops up grain from a lower level and deposits it in a silo or other storage facility.
In most cases, grain elevator also describes the entire elevator complex, including receiving and testing offices, weighbridges, and storage facilities. It may also mean organizations that operate or control several individual elevators, in different locations. In Australia, the term describes only the lifting mechanism.
Before the advent of the grain elevator, grain was usually handled in bags rather than in bulk (large quantities of loose grain). Dart's Elevator was a major innovation. It was invented by Joseph Dart, a merchant, and Robert Dunbar, an engineer, in 1842 and 1843, in Buffalo, New York. Using the steam-powered flour mills of Oliver Evans as their model, they invented the marine leg, which scooped loose grain out of the hulls of ships and elevated it to the top of a marine tower.
Early grain elevators and bins were often built of framed or cribbed wood, and were prone to fire. Grain-elevator bins, tanks, and silos are now usually made of steel or reinforced concrete. Bucket elevators are used to lift grain to a distributor or consignor, from which it falls through spouts and/or conveyors and into one or more bins, silos, or tanks in a facility. When desired, silos, bins, and tanks are emptied by gravity flow, sweep augers, and conveyors. As grain is emptied from bins, tanks, and silos, it is conveyed, blended, and weighted into trucks, railroad cars, or barges for shipment.
In Australian English, the term "grain elevator" is reserved for elevator towers, while a receival and storage building or complex is distinguished by the formal term "receival point" or as a "wheat bin" or "silo". Large-scale grain receival, storage, and logistics operations are known in Australia as bulk handling.
In Canada, the term "grain elevator" is used to refer to a place where farmers sell grain into the global grain distribution system, and/or a place where the grain is moved into rail cars or ocean-going ships for transport. Specifically, several types of grain elevators are defined under Canadian law, in the Canadian Grain Act, section 2.
Both necessity and the prospect of making money gave birth to the steam-powered grain elevator in Buffalo, New York, in 1843. Due to the completion of the Erie Canal in 1825, Buffalo enjoyed a unique position in American geography. It stood at the intersection of two great all-water routes; one extended from New York Harbor, up the Hudson River to Albany, and beyond it, the Port of Buffalo; the other comprised the Great Lakes, which could theoretically take boaters in any direction they wished to go (north to Canada, west to Michigan or Wisconsin, south to Toledo and Cleveland, or east to the Atlantic Ocean). All through the 1830s, Buffalo benefited tremendously from its position. In particular, it was the recipient of most of the increasing quantities of grain (mostly wheat) that was being grown on farms in Ohio and Indiana, and shipped on Lake Erie for trans-shipment to the Erie Canal. If Buffalo had not been there, or when things got backed up there, that grain would have been loaded onto boats at Cincinnati and shipped down the Mississippi River to New Orleans.
By 1842, Buffalo's port facilities clearly had become antiquated. They still relied upon techniques that had been in use since the European Middle Ages; work teams of stevedores use block and tackles and their own backs to unload or load each sack of grain that had been stored ashore or in the boat's hull. Several days, sometimes even a week, were needed to serve a single grain-laden boat. Grain shipments were going down the Mississippi River, not over the Great Lakes/Erie Canal system.
A merchant named Joseph Dart, Jr., is generally credited as being the one who adapted Oliver Evans' grain elevator (originally a manufacturing device) for use in a commercial framework (the trans-shipment of grain in bulk from lakers to canal boats), but the actual design and construction of the world's first steam-powered "grain storage and transfer warehouse" was executed by an engineer named Robert Dunbar. Thanks to the historic Dart's Elevator (operational on 1 June 1843), which worked almost seven times faster than its nonmechanized predecessors, Buffalo was able to keep pace with--and thus further stimulate--the rapid growth of American agricultural production in the 1840s and 1850s, but especially after the Civil War, with the coming of the railroads.
The world's second and third grain elevators were built in Toledo, Ohio, and Brooklyn, New York, in 1847. These fledgling American cities were connected through an emerging international grain trade of unprecedented proportions. Grain shipments from farms in Ohio were loaded onto ships by elevators at Toledo; these ships were unloaded by elevators at Buffalo that shipped their grain to canal boats (and, later, rail cars), which were unloaded by elevators in Brooklyn, where the grain was either distributed to East Coast flour mills or loaded for further shipment to England, the Netherlands, or Germany. This eastern flow of grain, though, was matched by an equally important flow of people and capital in the opposite direction, that is, from east to west. Because of the money to be made in grain production, and of course, because of the existence of an all-water route to get there, increasing numbers of immigrants in Brooklyn came to Ohio, Indiana, and Illinois to become farmers. More farmers meant more prairies turned into farmlands, which in turn meant increased grain production, which of course meant that more grain elevators would have to be built in places such as Toledo, Buffalo, and Brooklyn (and Cleveland, Chicago, and Duluth). Through this loop of productivity set in motion by the invention of the grain elevator, the United States became a major international producer of wheat, corn, and oats.
In the early 20th century, concern arose about monopolistic practices in the grain elevator industry, leading to testimony before the Interstate Commerce Commission in 1906. This led to several grain elevators being burned down in Nebraska, allegedly in protest.
Today, grain elevators are a common sight in the grain-growing areas of the world, such as the North American prairies. Larger terminal elevators are found at distribution centers, such as Chicago and Thunder Bay, Ontario, where grain is sent for processing, or loaded aboard trains or ships to go further afield.
Buffalo, New York, the world's largest grain port from the 1850s until the first half of the 20th century, once had the United States' largest capacity for the storage of grain in over 30 concrete grain elevators located along the inner and outer harbors. While several are still in productive use, many of those that remain are presently idle. In a nascent trend, some of the city's inactive capacity has recently come back online, with an ethanol plant started in 2007 using one of the previously mothballed elevators to store corn. In the early 20th century, Buffalo's grain elevators inspired modernist architects such as Le Corbusier, who exclaimed, "The first fruits of the new age!" when he first saw them. Buffalo's grain elevators have been documented for the Historic American Engineering Record and added to the National Register of Historic Places. Currently, Enid, Oklahoma, holds the title of most grain storage capacity in the United States.
In farming communities, each town had one or more small grain elevators that served the local growers. The classic grain elevator was constructed with wooden cribbing and had nine or more larger square or rectangular bins arranged in 3 × 3 or 3 × 4 or 4 × 4 or more patterns. Wooden-cribbed elevators usually had a driveway with truck scale and office on one side, a rail line on the other side, and additional grain-storage annex bins on either side.
In more recent times with improved transportation, centralized and much larger elevators serve many farms. Some of them are quite large. Two elevators in Kansas (one in Hutchinson and one in Wichita) are half a mile long. The loss of the grain elevators from small towns is often considered a great change in their identity, and efforts to preserve them as heritage structures are made. At the same time, many larger grain farms have their own grain-handling facilities for storage and loading onto trucks.
Elevator operators buy grain from farmers, either for cash or at a contracted price, and then sell futures contracts for the same quantity of grain, usually each day. They profit through the narrowing "basis", that is, the difference between the local cash price, and the futures price, that occurs at certain times of the year.
Before economical truck transportation was available, grain elevator operators sometimes used their purchasing power to control prices. This was especially easy, since farmers often had only one elevator within a reasonable distance of their farms. This led some governments to take over the administration of grain elevators. An example of this is the Saskatchewan Wheat Pool. For the same reason, many elevators were purchased by cooperatives.
A recent problem with grain elevators is the need to provide separate storage for ordinary and genetically modified grain to reduce the risk of accidental mixing of the two.
In the past, grain elevators sometimes experienced silo explosions. Fine powder from the millions of grains passing through the facility would accumulate and mix with the oxygen in the air. A spark could spread from one floating particle to the other, creating a chain reaction that would destroy the entire structure. (This dispersed-fuel explosion is the mechanism behind fuel-air bombs.) To prevent this, elevators have very rigorous rules against smoking or any other open flame. Many elevators also have various devices installed to maximize ventilation, safeguards against overheating in belt conveyors, legs, bearing, and explosion-proof electrical devices such as electric motors, switches, and lighting.
Grain elevators in small Canadian communities often had the name of the community painted on two sides of the elevator in large block letters, with the name of the elevator operator emblazoned on the other two sides. This made identification of the community easier for rail operators (and incidentally, for lost drivers and pilots). The old community name often remained on an elevator long after the town had either disappeared or been amalgamated into another community; the grain elevator at Ellerslie, Alberta, remained marked with its old community name until it was demolished, which took place more than 20 years after the village had been annexed by Edmonton.
One of the major historical trends in the grain trade has been the closure of many smaller elevators, and the consolidation the grain trade to fewer places and among fewer companies. For example, in 1961, 1642 "country elevators" (the smallest type) were in Alberta, holding 3,452,240 tonnes (3,397,720 long tons; 3,805,440 short tons) of grain. By 2010. only 79 "primary elevators" (as they are now known) remained, holding 1,613,960 tonnes (1,588,470 long tons; 1,779,090 short tons).
In 2017, the United States had 25 billion US bushels (0.88 km3) of storage capacity, a growth of 25% in the previous decade
The city of Buffalo is not only the birthplace of the modern grain elevator, but also has the world's largest number of extant examples. A number of the city's historic elevators are clustered along "Elevator Alley", a narrow stretch of the Buffalo River immediately adjacent to the harbor. The alley runs under Ohio Street and along Childs Street in the city's First Ward neighborhood.
In the early pioneer days of Western Canada's prairie towns, when a good farming spot was settled, many people wanted to make money by building their own grain elevators. This brought in droves of private grain companies. Towns boasted dozens of elevator companies, which all stood in a row along the railway tracks. If a town were lucky enough to have two railways, it was to be known as the next Montreal. Many elevator rows had two or more elevators of the same company. Small towns bragged of their large elevator rows in promotional pamphlets to attract settlers. With so much competition in the 1920s, consolidation began almost immediately, and many small companies were merged or absorbed into larger companies.
In the mid-1990s, with the cost of grain so low, many private elevator companies once again had to merge, this time causing thousands of "prairie sentinels" to be torn down. Because so many grain elevators have been torn down, Canada has only two surviving elevator rows; one located in Inglis, Manitoba, and the other in Warner, Alberta. The Inglis Grain Elevators National Historic Site has been protected as a National Historic Sites of Canada. The Warner elevator row is, as of 2019, not designated a historic site, and is still in use as commercial grain elevators.
During the Battle of Stalingrad, one particularly well-defended Soviet strongpoint was known simply as "the Grain Elevator" and was strategically important to both sides.
Given a large enough suspension of combustible flour or grain dust in the air, a significant explosion can occur. A historical example of the destructive power of grain explosions is the 1878 explosion of the Washburn "A" Mill in Minneapolis, Minnesota, which killed 18, leveled two nearby mills, damaged many others, and caused a destructive fire that gutted much of the nearby milling district. (The Washburn "A" mill was later rebuilt and continued to be used until 1965.) Another example occurred in 1998, when the DeBruce grain elevator in Wichita, Kansas, exploded and killed seven people. A recent example is an explosion on October 29, 2011, at the Bartlett Grain Company in Atchison, Kansas. The death toll was six people. Two more men received severe burns, but the remaining four were not hurt.
Almost any finely divided organic substance becomes an explosive material when dispersed as an air suspension; hence, a very fine flour is dangerously explosive in air suspension. This poses a significant risk when milling grain to produce flour, so mills go to great lengths to remove sources of sparks. These measures include carefully sifting the grain before it is milled or ground to remove stones, which could strike sparks from the millstones, and the use of magnets to remove metallic debris able to strike sparks.
The earliest recorded flour explosion took place in an Italian mill in 1785, but many have occurred since. These two references give numbers of recorded flour and dust explosions in the United States in 1994: and 1997 In the ten-year period up to and including 1997, there were 129 explosions.
During the sixth season of the History Channel series Ax Men, one of the featured crews takes on the job of dismantling the Globe Elevator in Wisconsin. This structure was the largest grain-storage facility in the world when it was built in the 1880s.