Volunteers converged Saturday on New Melones Reservoir for a family-organized search in the case of Laci Peterson, missing from Modesto for nearly two months.
"We had about 100 people, six teams of horses and 10 boats searching the reservoir today, but we didn't find anything," said Peterson's stepfather, Ron Grantski of Modesto.
The search at New Melones, on the border of Tuolumne and Calaveras counties, was the third in a series of weekend efforts that began Feb. 8.
Previous searches looked at range land and waterways in western Stanislaus and southern San Joaquin counties, and Don Pedro Reservoir in Tuolumne County. Police have assisted the family in choosing the search sites.
Grantski said he did not know for sure when another search would be conducted.
Grantski reported Peterson missing on Christmas Eve. The 27-year-old was eight months pregnant at the time of her disappearance, and her due date passed this month.
Police carried out an extensive search from the foothills to the Berkeley Marina.