The Los Angeles Aqueduct is Wild

TL;DR

The 300-mile LA Aqueduct gravity-feeds Sierra Nevada snowmelt to LA using canals, tunnels, and siphons — an engineering marvel built through political corruption and environmental destruction.

Key Points

• 1.The aqueduct is a 300-mile gravity machine with zero pumps. Starting 2,500 feet higher than its endpoint at The Cascades, it uses careful grading across canals, concrete conduits, and tunnels to move water entirely by elevation drop.
• 2.William Mulholland opened the aqueduct on November 5, 1913, declaring 'There it is, Mr. Mayor. Take it!' Today, roughly a third of LA's water still comes through this system from the Eastern Sierra Nevada.
• 3.The Owens Valley land acquisitions were carried out in bad faith, sparking the California Water Wars. In 1924, ranchers dynamited the canal and seized the Alabama Gates; the resistance collapsed only when the Inyo County Bank embezzlement scandal wiped out community savings in 1927.
• 4.Owens Lake dried up after diversion and became the single largest source of dust pollution in the entire US at times. LA has spent over $1 billion attempting to mitigate the dust problem from exposed lakebed sediment alone.
• 5.Jawbone Canyon required a pressurized inverted siphon descending 850 feet, generating ~370 psi. The steel pipes had to be manufactured on the East Coast and shipped around Cape Horn because the Panama Canal wasn't yet complete.
• 6.Eight hydroelectric plants along the aqueduct generate hundreds of megawatts and helped pay for the project. The Elizabeth Tunnel — 5 miles through rock and loose wet ground — was the most difficult section and feeds the largest plant, San Francisquito Power Plant No. 1.
• 7.The 1928 St. Francis Dam failure killed 400+ people and destroyed sections of the aqueduct, ruining Mulholland's reputation. Workers restored the aqueduct to service in just 12 days, and the dam was never rebuilt.