WEST GLACIER, Mont. (AP) — For tourists trying to get to some sights in Glacier National Park, it’s been a dam inconvenience.

Travel along part of a popular route through the Montana landmark was limited for the fourth straight day Thursday after heavy rains caused a large beaver dam to fail and wash debris down a hillside early Wednesday, rangers said.

The mudslide dragged dozens of trees and debris onto the scenic Going-to-the-Sun Road on the west side of the park, near some heavily used sights such as Lake McDonald, Lake McDonald Lodge, Apgar Visitor Center, Apgar Campground and various hiking trails.

Park officials hope to have the section of road fully cleared for the Memorial Day weekend, The Missoulian newspaper reported.

Flooding and mudslides limited access to 13 miles of that road at various times from Monday through Wednesday. Just one lane of the road was open Thursday with officials directing traffic, so visitors could experience delays of about 20 minutes.