A popular Palo Alto Baylands trail will be closed Wednesday, Sept. 5, while crews repair a hole beneath a floodgate that has caused mosquitoes to proliferate, the Santa Clara Valley Water District has announced.
The tidal gates in the Palo Alto Flood Basin allow water to create habitat for wildlife and protects against flooding from Matadero, Adobe and Barron creeks in Palo Alto during heavy rains and high-tide events.
Scouring tides over time have washed away sand and sediment from beneath the structure, causing a basketball-sized hole underneath. Pooling water from tidal flows activated dormant salt marsh mosquito eggs, which have hatched into large numbers.
Water-district contractors will pump fast-setting concrete into the hole during low tide. A more permanent fix has not yet been developed, but is planned, officials said. The gates were built in the late 1950s and are not weakened in any way, officials said.
The trail, which is just north of the Palo Alto Baylands Nature Preserve, will be closed for the day beginning at 8 a.m. Work will take place until about 7 p.m., with some construction noise, the district said.