I-15 Traffic Cameras: Complete Interstate 15 Guide - San Diego to Montana

Interstate 15 stretches 1,433 miles from San Diego's southern terminus to the Canadian border at Sweet Grass, Montana. This major Southwest-to-Rocky Mountain corridor handles immense daily volumes; in Las Vegas, I-15 records over 332,000 vehicles per day, while the segment through Salt Lake City sees an Average Annual Daily Traffic (AADT) of 314,330. According to the FHWA, real-time traffic monitoring helps drivers make safer, more informed decisions. Research indicates that real-time traveler information systems can reduce incident-related delays by up to 40% by providing drivers with the ground-truth visual data needed to bypass bottlenecks. Every camera is plotted on an interactive map — zoom, search, and click to view any location instantly.

I-15 Route Overview

I-15 passes through six states: California, Nevada, Arizona (29 miles through Virgin River Gorge), Utah, Idaho, and Montana.

According to the FHWA, real-time traffic monitoring helps drivers make safer, more informed decisions.

Major Cities Along I-15

State-by-State I-15 Guide

California (287 miles)

I-15 begins at the I-5/I-8 interchange in San Diego and heads north through Temecula wine country, the Inland Empire, and over Cajon Pass into the Mojave Desert. The California segment carries some of the heaviest traffic on the entire route, particularly between Riverside/Ontario and Barstow during Vegas weekend surges.

• San Diego: Southern terminus, connects to I-5 and I-8
• Temecula: Wine country, significant weekend traffic
• Riverside/Ontario: Inland Empire congestion, I-10/I-15 interchange
• Victorville: High Desert hub, post-Cajon Pass traffic
• Barstow: I-15/I-40 junction, gateway to Vegas

Nevada (123 miles)

Nevada's I-15 segment connects the California border at Primm to the Arizona line near Mesquite, passing through the heart of Las Vegas. The approach to the Strip generates some of the most predictable yet extreme traffic patterns in America, particularly on weekend evenings.

• Primm: California/Nevada border, casino stops
• Las Vegas: Major destination, Strip approach congestion
• Mesquite: Northeast Nevada, Arizona border

Arizona (29 miles)

The shortest I-15 segment cuts through the dramatic Virgin River Gorge — a scenic but challenging canyon with steep grades, narrow shoulders, and rock fall zones. Winter storms can close this segment entirely.

Utah (401 miles)

Utah contains the longest I-15 segment, stretching from St. George near Zion National Park through the Wasatch Front urban corridor to the Idaho border. The Salt Lake Valley section handles massive commuter traffic between Provo and Ogden, while winter ski traffic to resorts like Alta and Snowbird adds weekend congestion via I-215.

• St. George: Gateway to Zion National Park
• Cedar City: Access to Brian Head ski resort
• Provo: BYU, Utah Valley congestion
• Salt Lake City: Major hub, I-15/I-80 interchange
• Ogden: Northern Utah population center

Idaho (196 miles)

Eastern Idaho's I-15 segment passes through Pocatello and Idaho Falls, serving as the connection between Utah's Wasatch Front and Montana. The I-15/I-86 junction at Pocatello is a key interchange for traffic headed to Boise.

• Pocatello: I-15/I-86 junction
• Idaho Falls: Eastern Idaho hub

Montana (397 miles)

Montana's long I-15 segment traverses some of the most remote terrain on the entire interstate, from Butte through Helena and Great Falls to the Canadian border at Sweet Grass. Severe winter conditions including blizzards, black ice, and whiteout conditions make camera monitoring essential October through April.

• Butte: I-15/I-90 junction, mining history
• Helena: State capital
• Great Falls: Northern Montana, near Glacier National Park
• Sweet Grass: Canadian border crossing (continues as Alberta Highway 4)

Critical Segments and Hazards

Salt Lake Valley - Point of the Mountain

The Point of the Mountain segment between Salt Lake City and Utah Valley is notorious for strong crosswinds affecting trucks and trailers, winter fog inversions reducing visibility, heavy commuter traffic between Provo and Salt Lake, and I-15/I-215 interchange congestion.

Idaho and Montana High Plains

Northern I-15 through Idaho and Montana features severe winter hazards including blizzards, black ice, and whiteout conditions. Long distances between towns mean limited services. Wildlife crossings — especially deer and elk at dawn and dusk — pose additional risks. The Sweet Grass/Coutts crossing connects to Canada where I-15 becomes Alberta Highway 4.

Weather Considerations by Region

Peak Traffic Times

Using TrafficVision.Live for I-15

TrafficVision.Live aggregates traffic cameras from California (Caltrans), Nevada (NDOT), Utah (UDOT), Idaho (ITD), and Montana (MDT) into one interface. Search "I-15" to filter cameras along the entire corridor, or search specific cities like "Las Vegas" or "Salt Lake" for local coverage. With 135,000+ cameras from 600+ official sources across 130+ countries, TrafficVision.Live is the most comprehensive traffic monitoring platform available.

State Guides Along I-15

• California Traffic Cameras
• Nevada Traffic Cameras
• Arizona Traffic Cameras
• Utah Traffic Cameras
• Idaho Traffic Cameras
• Montana Traffic Cameras

Other Interstate Guides

• I-95 Traffic Cameras (East Coast)
• I-10 Traffic Cameras (Southern)
• I-80 Traffic Cameras (Transcontinental)

Traffic Camera Resources

• How Traffic Cameras Work
• Best Times to Check Cameras
• Custom Routes for Traffic Camera Monitoring