County parks staff last week began installing water safety barriers around the swimming area at Lewis Creek Park.

The county decided to install the barriers last year after two 6-year-old children were struck while swimming in that location by a runaway personal watercraft.

One, Zach Maynard, later died in a Portland hospital of his injuries. Kennedy Swenson was seriously injured but survived, after suffering multiple broken bones and dental injuries.

Rachel Maynard, Zach's mother, had joined the county Parks Commission shortly before the tragedy, which law enforcement officials ruled la...