THE WEIGHT OF INFRASTRUCTURE

Construction on various flood control projects for the Los Angeles, Rio Hondo, and San Gabriel Rivers collectively poured more than 4,000,000 tons of concrete and placed nearly 75,000 tons of reinforced steel. 

Construction on the various flood control projects also displaced more than 23,000,000 tons of earth. The LA River also averages a daily discharge of over 200 million gallons of water per day. 

When broken down into 1-mile sections, it is estimated that each mile of the LA River would contain approximately 78,000 tons of concrete and 1,500 tons of reinforced steel.  

Volume = Length x Width x Thickness 

Construction on a Boulevard Type I project requires approximately 28,826 tons of concrete, calculated by multiplying the area (1 mile by 100 feet) and thickness (8 inches) to yield 353,760 cubic feet, or 13,103 cubic yards, which increased to 14,413 cubic yards after applying a 10% waste factor. 

Construction for Avenue Type I calls for about 20,084 tons of concrete, based on a required 10,042.12 cubic yards. Local Street construction utilizes roughly 10,336 tons of concrete, derived from 5,168.142 cubic yards. 

Altogether, the Boulevard I, Avenue I, and Local Street projects demand more than 59,000 tons of concrete to complete. 

One mile of freeway, for a 120-foot width and 9-inch thickness, demands roughly 19,360 cubic yards of concrete, which weighs around 77.4 million pounds or 38,720 tons.  

For the county’s 1,000-mile freeway system, this works out to some 35.6 million tons of concrete.  

In 50 years, with resurfacing and maintenance, the amount of material used could be as high as 53.4 million to 64.1 million tons.  

The Los Angeles Department of Water and Power (LADWP) maintains around 7,340 miles of water mains and trunk lines, totaling approximately 38.8 million feet and weighing over 11,600 tons. Its system includes over 10 major reservoirs, with Santa Ynez alone holding 117 million gallons estimated reservoir infrastructure weighs around 100,000 tons.  

LADWP replaces about 280,000 feet of piping annually, totaling roughly 150 tons with all materials. Additionally, dozens of treatment facilities and pumping stations across the county add significant mass around 37,500 tons for 50 major sites factoring in concrete, structures, and equipment. This infrastructure supports a vast and aging water system. 

One mile of Metro light rail track, including slab, rebar, and embedded rail, weighs over 7,200 tons.  

At-grade stations like Figueroa in Pasadena add roughly 400 tons of concrete and steel.  

Across 109 miles, Metro’s full light rail network consumes about 785,000 tons of concrete and 22,600 tons of steel.  

Combined, Metrolink and Amtrak (both heavy rail) account for over 1.3 million tons in track and structure, plus 30,000 plus tons in train weight.  

Union Pacific’s Hobart Yard spans 250 acres and contains 1.5 million cubic feet of concrete and 50,000 tons of steel—equal to 15 Olympic pools and the weight of 330 fully loaded Boeing 747s.  

The facility moves 150,000 metric tons of intermodal containers, 80,000 of bulk freight, 30,000 of automobiles, and 20,000 of miscellaneous cargo annually.  

Diesel-powered freight contributes 14.5 tons of nitrogen oxides and 0.27 tons of particulate matter per day.

According to Bureau of Street Services, the City of Los Angeles has approximately 6,500 miles of streets, with 5,840 miles paved with asphalt concrete and 493 miles with Portland cement concrete.  Based on the equation Volume = Length x Width x Thickness, LA’s various streets embody the following quantities of concrete: 

1. Boulevards – 16,254.6 cu. yd. 
2. Avenues – 12,241.4 cu. yd.  
3. Collector Streets – 8,588.6 cu. yd.  
4. Local Streets – 7,837.8 cu. yd. 

A typical bus stop weighs between 1.25 and 1.75 tons, composed of steel or aluminum frames (300–500 lbs), glass or plastic panels (100–200 lbs), and a heavy concrete pad (2,000–3,000 lbs).  

Construction materials like concrete and steel emit significant CO₂ during production, contributing to global greenhouse gases.  

Mining for metals, sand, and petroleum-based plastics displaces large natural resources.  

Diesel and natural gas buses have historically emitted pollutants like CO, NOx, and PM, though electric buses now reduce operational emissions. However, battery production introduces new environmental impacts from lithium and cobalt extraction, continuing the cycle of material and energy demands. 

Los Angeles’ bridges and viaducts are massive structures that require huge amounts of material. When it was built in 1932, the original Sixth Street Viaduct used around 49,000 cubic yards of concrete and 6 million pounds of reinforcing steel. The new Sixth Street Viaduct needed even more, over 34,000 cubic yards of concrete and about 18 million pounds of steel, plus giant seismic bearings that each weigh several tons.  

Most L.A. River crossings today weigh somewhere between 3,000 and 8,000 tons overall, depending on the size. These huge material demands reflect both the scale of the bridges and the need for earthquake safety.

More than a billion square feet of warehouses and distribution centers cover Southern California. Residents have experienced both economic change and environmental degradation. 

The Alameda Corridor is a 20-mile freight rail route in southern Los Angeles County, connecting the ports of Long Beach and Los Angeles. In its construction over 1 million cubic yards of concrete was used, 75,000 tons of steel, and 400,000 tons of ballast. 

Boyle Heights is among the oldest cities in Los Angeles. It is also a heavily industrialized zone with over 11 acres of warehouses now with various uses.