Built in 1942–1944 as emergency wartime infrastructure, the Big Inch and Little Big Inch pipelines carried crude and refined oil 1,254 miles from Texas to New Jersey when German U-boats made coastal tanker shipments too dangerous.
Why did these pipelines go from Texas to the East Coast?
German U-boats sank oil tankers along the Atlantic coast, forcing the U.S. to move oil overland via pipelines in 1942–1944 to keep refineries and war production running.
Between 1942 and 1945, Nazi submarines sent 48 tankers—totaling 230,000 tons—to the bottom in the Gulf and Atlantic. The pipelines bypassed those deadly waters entirely. Funded by the War Shipping Administration and the Defense Plant Corporation, the $95 million project (about $1.8 billion today) ensured East Coast factories and military bases never ran short of fuel. Once operational, the lines supplied 40% of the region’s wartime petroleum needs.
What’s the geographic route of these pipelines?
The pipelines run from Longview, Texas, to Linden, New Jersey, crossing six states: Texas, Louisiana, Arkansas, Tennessee, Kentucky, and New Jersey.
Crews laid pipe through swamps, farmland, and even residential neighborhoods to meet the wartime deadline. Today the right-of-way is a roughly 50-foot-wide corridor in most sections. Some segments now run beneath interstates I-20 and I-40, while others stay above ground near pumping stations and valve sites.
How long are the pipelines, and what do they carry?
Combined they span 1,254 miles and can move 340,000 barrels of oil per day—the Big Inch carries crude oil and the Little Big Inch carries gasoline, diesel, and other refined products.
The Big Inch (24-inch diameter) started service in August 1943. Its smaller sibling, the Little Big Inch (20-inch), began operations in March 1944. At the time, 340,000 barrels per day equaled about 14.3 million gallons—enough to fill 21 Olympic-sized swimming pools daily.
When were the pipelines built, and who owns them now?
Originally built by the U.S. government under the Petroleum Administration for War, the lines were sold in 1947 to a private consortium led by Texas Eastern Transmission Corporation. In 2026, Enterprise Products Partners and Energy Transfer jointly manage the system, which is also part of the U.S. Strategic Petroleum Reserve buffer network for emergency drawdowns.
What’s the difference between the Big Inch and Little Big Inch?
The Big Inch is 24 inches wide and carries crude oil; the Little Big Inch is 20 inches wide and carries refined products like gasoline and diesel.
Both pipelines share the same general route but operate as separate systems with dedicated pumping stations and storage tanks. The Little Big Inch briefly carried natural gas between 1947 and 1949 before switching back to refined products in 1957 to meet growing demand.
Why were they nicknamed the “Inch pipelines”?
They were named after their diameters in inches—24 inches for the Big Inch and 20 inches for the Little Big Inch.
Press reports in 1943 loved the simple, memorable nicknames. Newspapers routinely called them “the Big Inch” and “the Little Big Inch,” creating a brand that stuck even though modern pipelines are now usually described by nominal pipe size (NPS).
How fast were these pipelines built?
Construction crews finished the entire 1,254-mile system in just 15 months between August 1942 and March 1944.
At peak, more than 15,000 workers, 7,500 pieces of equipment, and 100 trains delivered pipe, fuel, and supplies around the clock. Crews used electric welding, pre-fabricated sections, and overnight shifts to hit the deadline. This speed set a new benchmark for large-scale energy infrastructure projects.
What role did these pipelines play during World War II?
The pipelines delivered roughly 40% of the East Coast’s wartime petroleum needs and eliminated U-boat losses by shifting oil transport inland.
From mid-1944 through the end of the war, the lines moved about 320,000 barrels per day to refineries in New Jersey, Pennsylvania, and the Midwest. By reducing tanker traffic, they freed up ships for troop and supply transport across the Atlantic, directly supporting Allied logistics.
What happened to the pipelines after the war?
After the war, the Little Big Inch briefly carried natural gas before returning to refined products in 1957; sections are preserved as historic sites.
The federal government sold the system in 1947. Private operators upgraded valves, pumps, and coatings to extend service life. In Kentucky, a 30-mile segment became a National Historic Landmark in 2000, and local museums in Texas and New Jersey display pipeline artifacts.
How did these pipelines change the oil industry?
They proved welded steel pipelines could move oil over long distances reliably, replacing short wooden troughs and rail cars.
Before 1943, most U.S. oil moved only a few hundred miles by rail or barge. The Inch pipelines introduced electric pumps, continuous monitoring, and corrosion-resistant coatings that became industry standards. Their success led directly to the post-war build-out of the U.S. pipeline grid.
Can you visit any part of the pipelines today?
The Texas Energy Museum in Beaumont offers exhibits on early pipeline construction. Along I-20 in Arkansas and I-40 in Tennessee, roadside signs mark the right-of-way. A few valve sites and pumping stations have interpretive fencing; always check local access rules before approaching.
How are these pipelines monitored for safety today?
Under the 2020 PIPES Act, the U.S. Pipeline and Hazardous Materials Safety Administration requires annual integrity assessments, leak detection systems, and 50-foot safety buffers around critical components.
Operators run inline inspection tools (“smart pigs”) every 5–10 years to measure wall thickness and detect cracks. Above-ground valves and pumping stations are fenced and alarmed; signs warn of buried pipelines and emergency contacts. The EPA also tracks spill response plans and corrosion control measures.
Are these pipelines still important today?
The lines remain a key part of U.S. energy security, supplying refineries and the Strategic Petroleum Reserve network with up to 340,000 barrels per day.
Since 2020, Enterprise and Energy Transfer have invested in advanced coatings, cathodic protection, and digital leak-detection software to extend service life beyond 80 years. The system still connects Gulf Coast refineries to East Coast terminals, helping balance regional supply during hurricanes or global disruptions.
What’s the historical significance of these pipelines?
They represent a wartime innovation that saved lives, reshaped logistics, and established the modern U.S. pipeline grid.
Without the Inch pipelines, the East Coast likely would have faced severe fuel shortages in late 1944 and early 1945. Post-war, their success inspired the continent-wide pipeline system we use today—from Alaska to the Gulf.
How do these pipelines compare to modern ones?
Modern pipelines are longer, digitally monitored, and built to stricter safety codes, but the Inch pipelines set the core template for welded steel, electric pumping, and long-distance transport.
Today’s lines often exceed 2,000 miles and use fiber-optic leak detection and drone surveillance. Yet the Inch pipelines’ basic architecture—24- and 20-inch diameters, buried or above-ground routing, and centralized pumping—remains recognizable in projects like the Keystone XL and Colonial Pipeline systems.
Edited and fact-checked by the FixAnswer editorial team.
