Emergency agencies have issued tsunami warnings for Northern California and said evacuations in some areas could be possible, but conditions in the San Joaquin Delta remain unaffected at this point.
However, an official for San Joaquin County's Office of Emergency Services said people along Delta waterways and recreating near riverbanks should remain aware of potential changes to conditions.
"If you have a child or dog close to water and there is enough lift, it could catch people off guard," said Michael Cockrell, assistant coordinator of emergency services for San Joaquin County.
Although the California Emergency Management Agency warned that 6-foot tsunami waves could reach the California coast and evacuations could be considered, Cockrell said local weather conditions are working in the county's favor.
"Our high tide (in San Francisco Bay) was 7 a.m., so the tide is going out when a wave would be coming in," Cockrell said. "We also have good weather right now; water isn't slapping the levees."
The warnings were triggered in the aftermath of a 8.9-magnitude earthquake in Japan. Although there are concerns the water could be pushed into San Francisco Bay and through the Delta, a California Department of Water Resources spokesman said the possibility is remote at this point. Emergency crews are well-equipped to deal with such scenarios, he said.
"Emergency crews conduct drills for these sort of things all the time, so they are ready when the real thing comes," said Sandy Cooney of the DWR. "But the bottom line is that all is well right now."
Delta residents were not ready to push the panic button Friday morning.
As he walked near downtown Rio Vista and the Sacramento River, resident Hale Conklin said there were no signs the water level had risen since the warnings for California were issued.
"There's no concern out here," said Conklin, who also serves as the city's treasurer. "We don't have any plans at this point for dealing with any tsunami-related issues."
The water district that oversees the region's water supply said they were prepared for potential tsunami-related issues, but everything was calm as of Friday afternoon.
"The most likely impact, if it reached San Francisco Bay, would be our wastewater plant at the foot of the Bay," said Charles Hardy, a spokesperson for East Bay Municipal Utilities District. "But so far, issues have been in the ocean and not the Bay."
Despite the relative calm, the U.S. Coast Guard remains on alert. In Rio Vista, the Coast Guard pulled some of their equipment out of the water and have crews on standby, said Dan Dewell, spokesperson for the 11th Coast Guard District in Alameda. The crews pulled some of their equipment out of the water in case a surge of water came through the area.
"We don't have any reports of disturbances or damages, but we have to be cautious," he said.
While people may be tempted to rush to areas with reports of rising water levels, Dewell said to err on the side of caution, and people should avoid putting themselves in a dangerous situation.
"We don't want people running down to the water's edge," he said. "We're still searching for someone up the Klamath River."
A man who was taking photos of the water in Del Norte County was swept away and is still missing. Two friends he was with have since been located, Dewell said.
While property has not been damaged in San Joaquin County, the effects the region could feel will likely be more indirect, Cockrell said.
"If there were to be damage along the coast, utilities could be affected," he said. "A lot of our residents also conduct business in Japan and have families over there."
The county could also serve as a staging ground for aid missions to Japan, he said.
Contact reporter Jordan Guinn at firstname.lastname@example.org.