MORGAN HILL -- Uvas Reservoir maxed out its 3.2-trillion-gallon capacity this week, triggering a phone alert from the water district warning downstream residents to keep an eye on the neighboring creek.

The reservoir hit spillway level around 9 a.m. Wednesday and as of Friday evening was still pouring thousands of gallons per minute down Uvas Creek. But despite some past inconveniences caused by the waterway overflowing its banks, those in the know weren't particularly concerned.

Diana Bristol, assistant manager at Thousand Trails RV Park, said they routinely check the Santa Clara Valley Water District's website to monitor water levels.

"When the water level reaches the level of the spillway, we can pretty much tell it's coming," said Bristol.

That park has a low-lying bridge that was overrun by water in March 2011 and trapped campers in the park for six to 12 hours, Bristol said, but she knew of no flooding that ever reached the level of a crisis.

"They couldn't get out for a while, but most RV'ers are pretty self-contained," she said. "It wasn't much of a blip on the radar screen at all. We've been knocking on doors and there hasn't been concern other than on Christmas Eve. People didn't want to spend Christmas Eve in the park."

Forecasters predicted a small amount of rain in the South Bay overnight into Saturday morning, and said there could be scattered showers through the day. But nobody expected any trouble, even at Uvas, where the 3.2-trillion-gallon reservoir was expected to overflow its 14 million gallon surplus for the next week.

"It's early, but it's not unusual," said Joan Maher, deputy officer of water operations for the district. "The Uvas spills over about six out of every 10 years. Smaller reservoirs are actually built that way."

Robert Caputo, who manages the Uvas Pines RV Park, said the only concerns are making sure picnic tables and chairs aren't picked up by rising waters and carried downstream.

"There's a history of the creek flooding, but never into the park," he said. "The creek is a good 20 feet below the park."

He said watching the water level comes with the territory of living in a watershed canyon.

"When you get wet weather, it's kind of what you expect," he said. "Last Sunday, creeks were coming out of the hills, flowing across roads. There were waterfalls happening. It's obviously going to fill the lake and overflow. You expect it, and you go look at the creek and watch it."

In addition to Uvas, there have been water releases at Coyote, Guadalupe and Stevens Creek reservoirs, although none of those are at maximum capacity.

District officials said that overall, Santa Clara County water banks are 53 percent full and the current state of affairs is something to be appreciated.

"It's good to have this kind of infill into our local reservoirs," Maher said. "It gives us flexibility. We don't have to wait for a miracle March or wonder so much."

Contact Eric Kurhi at 408-920-5852. Follow him at Twitter.com/erickurhi.