The Utah County Sheriff's Office closed parts of the Provo River Parkway on Sunday because rising water was undercutting the trail.
The trail was closed about 12:30 p.m. above and below Canyon Glen Park, sheriff's Sgt. Spencer Cannon said. He said water releases from Deer Creek Dam had led to the erosion.
The trail already had been closed at Bridal Veil Falls for demolition of an old restaurant structure and tram site.
Deer Creek Dam was forecast to release large volumes of water beginning Friday to make space in the reservoir for the runoff from the spring snowmelt, according to a notice by Provo Mayor John Curtis.
"Properties along the Provo River may experience minor damage due to the high water," Curtis said in his blog, the Provo Insider. "Additionally, the river at this flow will be extremely dangerous, cold and swift."
The notice urged people to stay off of closed roads and out of picnic areas and campgrounds and to keep children and nonswimmers at a safe distance from the water's edge.