How a Grain Elevator Works, Step by Step

Drive through farm country and the tallest structure on the horizon is usually a grain elevator. It looks simple from the road, but inside it is a carefully organized machine for receiving, checking, storing and shipping a crop. Here is how it works, from the moment a truck pulls in.

What an elevator is for

An elevator does four jobs. It receives grain from farms, measures its quantity and quality, stores it until it is needed, and loads it out to a buyer. The name comes from the bucket lift, often called a leg, that raises grain high enough to flow by gravity into storage bins.

From truck to bin

1. Weigh in. The loaded truck drives onto a scale, and the gross weight is recorded.
2. Probe and sample. A probe pulls grain from several points in the load. This sample is the basis for everything that follows.
3. Test the sample. Staff check moisture, test weight, damaged kernels and foreign material.
4. Grade and price. The results decide the grade, and any discounts for moisture or damage are applied to the bid.
5. Dump. The truck unloads into a receiving pit under the driveway.
6. Lift. The leg carries grain upward on a belt fitted with buckets.
7. Distribute. A spout at the top directs grain to the chosen bin.
8. Weigh out. The empty truck is weighed again, and the difference is the net weight.

Different kinds of elevators

Not every elevator plays the same role.

• Country elevators sit close to farms and collect grain from many producers.
• Subterminals are larger and often ship in bigger lots, such as multi-car rail shipments.
• Terminal and export elevators sit on major rail lines, rivers or ports and load barges and ships.

Storage also varies. Tall upright concrete or steel bins hold grain in vertical columns, while flat storage buildings and temporary piles hold large volumes at lower cost but need closer attention to weather and pests.

Why blending matters

Because grain from many farms arrives at different quality levels, an elevator can blend loads to meet a buyer's specification. A load slightly above the moisture limit can be offset by a drier one, within the rules of the contract and grade standards. This is one reason elevators keep careful records of what went into each bin.

Loading out

When a buyer needs the grain, the elevator reverses the flow. Grain runs from the bin through a spout into a truck, a railcar, a barge or a ship. At this stage the grain is sampled and weighed again, and the shipping paperwork is prepared.

Tips for farmers delivering grain

• Know your moisture before you arrive, so there are no surprises on the scale.
• Clean out trucks between crops to avoid contamination or mixed grades.
• Ask how discounts are calculated and keep your scale tickets.
• Deliver early in the day during harvest if you want to avoid long lines.

Frequently asked questions

Why is grain sampled before it is dumped? The sample tells the elevator which bin the grain belongs in and what price applies. Once grain is mixed into a bin, it cannot be separated again.

Can an elevator store grain for me? Many elevators offer storage for a fee, with terms that differ from place to place. Ask about storage charges, shrink and what happens if the elevator ever has financial trouble.

What is a bucket leg? It is a vertical belt or chain with buckets attached that lifts grain from the receiving pit to the top of the elevator.