Traffic on the Interstate 70 mountain corridor dropped nearly 3% in 2025 compared to 2024, according to Colorado Department of Transportation data.
Traffic counts show just less than 12.6 million vehicles drove through the Eisenhower-Johnson Memorial Tunnels in 2025, one of the lowest totals since 2020, when the COVID-19 pandemic interrupted traffic patterns nationwide.
“Year-over-year I-70 traffic volumes fluctuate based on several variables, such as holiday timing and road conditions,” CDOT communications manager Austyn Dineen said in an email. “Consquently, these comparisons are not always apples-to-apples.”…