MileCheck Highway Report

MileCheck Highway Report: California, September 2026

by MileCheck · October 1, 2026

What California's department of transportation (DOT) feed showed in September 2026. Part of the national MileCheck Highway Report, September 2026.

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How we got these numbers: These counts come from a daily copy of California's department of transportation (DOT) feed, Sept. 1 through Sept. 30, 2026. Each alert was counted once. An alert posted and removed between two daily copies is not counted. Not all states report the same data. Fire figures are as of Sept. 30, 4 PM Pacific. Border waits are from U.S. Customs and Border Protection, saved every hour. Readings over five hours were treated as feed errors.

287crashes reported in September

960closures on the feed

1,966roadwork records on the feed

75wildfires on the national list, as of Sept. 30, 4 PM Pacific

Crashes

287 crashes were reported in California in September.

Routes with the most crash alerts

I-5 — 15
US-101 — 11
I-880 — 8

Areas named in two or more crash alerts

Napa (CA-121) — 3
Oroville (CA-70) — 2
Ventura (CA-33) — 2

Crashes marked fatal by the DOT

I-10 — September 2
I-80 — September 6
CA-118 — September 6
CA-91 — September 6
CA-78 — September 12
CA-58 — September 28

Closures and roadwork

960 closures and 1,966 roadwork records were on California's feed in September, out of 3,742 alerts of all types.

The routes with the most alerts were US-101, I-5 and I-80.

Winter closures

Roads that usually close for winter

SR-108, Sonora Pass — Closing date set by conditions. Caltrans aims to reopen before Memorial Day. Source
SR-4, Ebbetts Pass — Closing date set by conditions. Caltrans aims to reopen before Memorial Day. Source
SR-89, Monitor Pass — Closing date set by conditions. Caltrans aims to reopen before Memorial Day. Source
SR-120, Tioga Road / Tioga Pass (SR 120 W at Lee Vining Gate through Yosemite NP) — Usually closes in November and reopens late May or June. Source
SR-89, Lassen Park Highway (park road, NPS-managed; not a Caltrans closure) — Park road. Closed for snow about November to June. Source

Timing comes from each agency's own page. Exact dates depend on snow. We update this list each month through winter.

Border waits

Waits to enter the United States in standard passenger lanes at California's crossings, September, from hourly readings. Dates are local.

By crossing

Tecate — highest 5 hr (September 8), average 2 hr 5 min
San Ysidro — highest 4 hr (September 8), average 1 hr 48 min
Otay Mesa — highest 4 hr (September 27), average 1 hr 32 min
Calexico / West — highest 4 hr (September 7), average 1 hr 3 min
Calexico / East — highest 3 hr 20 min (September 15), average 51 min
Andrade — highest 1 hr 50 min (September 7), average 29 min

Live waits are at milecheckapp.com/borders.

Wildfires

California had 75 fires on the national wildfire list as of Sept. 30, 4 PM Pacific.

Largest fires, as of Sept. 30, 4 PM Pacific

Plaskett (Monterey County), 29,993 acres, 100% contained
Timber (Monterey County), 25,349 acres, 88% contained
Mp18 (Humboldt County), 7,599 acres, 100% contained
Dome (Mariposa County), 5,410 acres, 39% contained

Thank you to the firefighters and crews who worked these fires all season.

Live fire perimeters are at milecheckapp.com/fire.

See the national report or another state.

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Built from MileCheck's archive of state DOT road feeds. A new Highway Report comes out at the start of every month.