I-70 (Interstate 70) Road Conditions

Regional Hazards Along I-70

• Mountain Passes and High Elevations – Steep grades and sharp curves in mountainous regions can be hazardous year-round. In winter, snow and ice create slick conditions, while in summer, sudden thunderstorms or hail can reduce visibility and traction. Altitude can also affect vehicle performance and braking.
• Snow and Ice in Winter Months – From late fall through early spring, stretches of I-70 often see snow, freezing rain, and black ice. These conditions can trigger chain laws, traction requirements, and temporary closures, especially in Colorado and other high-elevation sections.
• Heavy Rain and Flooding – Low-lying areas and sections near rivers can be prone to flash flooding or standing water during intense rainstorms. Hydroplaning risk increases in heavy downpours, and reduced visibility can slow traffic significantly.
• Wind-Prone Plains – Open sections of I-70 across the Great Plains often experience strong crosswinds. High-profile vehicles like trucks and RVs are especially vulnerable to gusts that can cause lane drift or tip-over hazards.
• Construction and Work Zones – Seasonal maintenance and infrastructure improvements are common along I-70. Lane closures, reduced speed limits, and narrowed shoulders can increase accident risk, particularly when combined with high traffic volumes.
• Urban Congestion – In metropolitan areas, such as around Denver, Kansas City, and St. Louis, heavy commuter traffic and merging lanes can create congestion and increase the risk of rear-end collisions. Rush hour delays and construction bottlenecks are frequent concerns in these regions.
• Fog and Reduced Visibility – Certain valleys and river crossings along I-70 are prone to fog, especially in cooler months. Sudden drops in visibility can lead to dangerous chain-reaction accidents if drivers do not adjust their speed and following distance.