The slide scene at Olompali State Historic Park.
The County of Marin is closely monitoring a mudslide that occurred Tuesday evening (March 21) on a slope above Redwood Boulevard, just west of Gnoss Field. The site is state property within unincorporated Marin and Novato Fire District.
The slip caused significant erosion on the hill side, uncovering one of two PG&E gas main lines and possibly creating pressure on a North Marin Water District aqueduct that runs from Sonoma County to Marin. No gas line or waterline breach has occurred to date. No observable movement has occurred since Tuesday night and there is no immediate threat to residents.
PG&E and North Marin Water are on site cassessing and determining options to stabilize the hill and prevent further slip to protect infrastructure. PG&E is also de-pressuring lines out of an abundance of caution.
In addition, the slide moved a significant amount of water and mud in the immediate area and caused parts of the road below to buckle and break between an approximate 100-foot stretch of road. That portion of the frontage road, which runs adjacent to Highway 101 Southbound, will remain closed until further notice. There is no threat to, or closure of Highway 101 currently.
There are no residential structures in the immediate area. Current conditions do not warrant evacuation of the broader area.
Marin County Office of Emergency Management will continue to coordinate with P&GE to gather updated information about the incident and any change in conditions that may threaten the safety of residents. If conditions change, the Office of Emergency Management will send emergency alerts via AlertMarin.
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