Westbound Interstate 80 near Colfax slammed to a stop Tuesday after a livestock semi overturned and blocked the freeway, triggering a full shutdown for westbound traffic. There is still no estimated time for reopening, and all westbound drivers are being forced off at Rollins Lake Road. The detour has already jammed nearby surface streets as emergency and towing crews work to clear the scene. Anyone pointing their car toward Donner Summit should plan on significant delays or look for another way over the hill.
Traffic Alert: Interstate 80 westbound at Colfax closed due to an overturned livestock semi truck. No estimated time for reopening. Traffic being diverted at Rollins Lake Road. https://t.co/5dBWoaN1hI
— CAL FIRE NEU (@CALFIRENEU) June 23, 2026
What officials say
According to a post by CAL FIRE Nevada‑Yuba‑Placer Unit, westbound I‑80 at Colfax is shut down because an overturned livestock semi is blocking the roadway, and there is no estimate yet for when traffic will be moving again. Officials say all westbound vehicles are being diverted at Rollins Lake Road while crews continue work at the scene.
Alternate routes and live updates
During full closures in this stretch, Caltrans District 3 has previously routed passenger vehicles west on Rollins Lake Road to SR‑174, a go-to detour that helps push traffic around incidents in the narrow Colfax section. For real-time conditions and official detour information, drivers should check Caltrans District 3 and Caltrans QuickMap. Anyone with wiggle room in their schedule is better off delaying the trip until the freeway reopens or using lower‑elevation routes where possible.
Why this stretch sees frequent closures
The roughly three‑mile Colfax narrows and Donner Summit corridor are no stranger to extended shutdowns, with a steady history of crashes, spills and vehicle fires that tie up traffic for hours. In late May, a diesel tanker spill shut westbound lanes, according to The Sacramento Bee. Tight curves, steep grades and heavy commercial‑vehicle traffic all slow down cleanup and recovery, making this section far less forgiving than flatter runs of I‑80 between the valley and Lake Tahoe.
What drivers should do
Drivers in the Colfax area should avoid nonessential trips, follow posted detour signs and be ready for long waits on local roads feeding into the closure. Commercial drivers should anticipate potential holds or longer workarounds and build that time into their plans. Clearing and recovering an overturned livestock hauler often calls for specialized equipment and animal handling, which can drag out the timeline. This story will be updated once officials release an estimated or confirmed reopening time for westbound I‑80.
