Contra Costa storm history

A rain-slicked road led to the crash of a car at the intersection of Mount Diablo Boulevard and Iron Horse Regional Trail in Walnut Creek. The vehicle crashed through a fence and landed upside down in the rain-swollen San Ramon Creek bypass. The driver and one other individual pe…

One foot of water was reported on westbound Interstate 580 just east of Canal Boulevard.

The on and offramps from Canal Boulevard to Interstate 580 were flooded.

A vehicle was reported stuck in floodwaters on westbound State Route 4 at the Franklin Canyon onramp. The onramp was also reported as flooded.

Around 8 inches of water were reported on the ramp that connects eastbound State Route 24 to southbound Interstate 680.

Flooding reported on eastbound Interstate 80 at Pinole Valley Road.

Water was reported across all lanes of eastbound State Highway 24 at the junction with St Stephens Drive.

Water was reported on all lanes of Westbound State Highway 24 at Camino Pablo.

Flooding was blocking lanes on westbound Interstate 580 at Central Avenue.

Powerlines were downed along Boulevard Way near Walnut Creek.

Tree down in roadway along Danville Boulevard near Walnut Creek. Time estimated via radar.

Roadway flooding was reported at Westbound California Highway 4 and Westbound Interstate 80.

Significant flooding and runoff on Norris Canyon Road.

Two to three feet of water flowing across the road at Camino Tassajara and Sherman Ranch Road.

Slow lane starting to collapse with a crack approximately 10 feet long at the offramp from southbound Interstate 680 to El Pintado Road.

The southbound lane of McEwen Road just south of California Highway 4 was completely blocked due to mud, dirt, and rock.

A 6 inch deep puddle in the slow lane of westbound Interstate 80.

Flooding was reported at SB 160 over Main Street. Lane 1 was partially flooded with 2 inches of water.

The roof of a Big 5 Sporting Goods store in San Ramon caved in the early morning hours of the 27th after a main beam broke in the center of the store. Local officials from the San Ramon Valley Protection District stated that they believed heavy rain was a factor in the roof colla…

Mesonet station at Shadowhawk reported wind gusts over 60 mph.

Spotter reporting pea-sized hail near San Ramon.

Roadway flooding at SR-4 W and Alhambra Ave off ramp. Flooding across entire slow lane.

Roadway flooding at I-680 S and Crow Canyon Rd off ramp. Vehicles hydroplaning.

CHP reports several freeways including 680 and 24 have flooding in some or all lanes.

Media reported flooded roads at the intersection of Broadway and Cypress St in Walnut Creek.

Roadway flooding at I-680 S and Concord Ave off ramp, both lanes flooded.

Roadway flooding at SR-24 E and Saint Stephens Dr off ramp.

Right hand side and slow lane water on roadway of SB 680 junction with Treat Blvd.

Accumulating hail reported on the 680 corridor in Contra Costa.

On ramp from Canal Blvd to I-580 E flooded with 1-1.5 feet of water.

Roadway flooding reported.

Mud and rocks in roadway at Bailey Rd and Keller Canyon, mud coming down hill blocking left lane.

Vehicles getting stuck in water at Arthur Rd and Pacheco Blvd.

Contra Costa County Public Works is working to drain flood waters on Judith Court.

SB 4 McEwen Rd on ramp, side of hillside slid down and is blocking roadway.

Water covering two lanes 7 inches deep.

Mud flow along hillside at Bollinger Canyon Rd just west of Bear Tree Road crossing westbound lanes.

Roadway flooding at SR 24E at Acalanes Rd.

Roadway flooding reported at I680 N and Olympic Blvd on ramp, 8-10 inches of water in number 2 lane.

Small hail along with thunder and lightning reported in Orinda.

Small hail reported in southern Contra Costa county.

I-80 E adjacent to the Pomona on ramp, 2 feet of water in number 1 lane.

Accumulating hail reported in Kensington.

Small hail reported.